import unittest
from target import even_odd_count

class TestEvenOddCount(unittest.TestCase):
    def test_basic(self):
        self.assertEqual(even_odd_count(7), (0, 1))

    def test_even_odd_count_123(self):
        self.assertEqual(even_odd_count(123), (1, 2))

    def test_even_odd_count_negative_12(self):
        self.assertEqual(even_odd_count(-12), (1, 1))

    def test_even_odd_count_zero(self):
        self.assertEqual(even_odd_count(0), (1, 0))

    def test_even_odd_count_1000(self):
        self.assertEqual(even_odd_count(1000), (4, 0))

    def test_even_odd_count_negative_1000(self):
        self.assertEqual(even_odd_count(-1000), (4, 0))

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that even_odd_count(123) returns (1, 2)
# - test that even_odd_count(-12) returns (1, 1)
# - test that even_odd_count(0) returns (1, 0)

### Function:
def even_odd_count(num):
    """Given an integer. return a tuple that has the number of even and odd digits respectively.

     Example:
        even_odd_count(-12) ==> (1, 1)
        even_odd_count(123) ==> (1, 2)
    """
    even_count = 0
    odd_count = 0
    for i in str(abs(num)):
        if int(i)%2==0:
            even_count +=1
        else:
            odd_count +=1
    return (even_count, odd_count)

### Current tests:
import unittest
from target import even_odd_count

class TestEvenOddCount(unittest.TestCase):
    def test_basic(self):
        assert candidate(7) == (0, 1)

### Improved tests:


import unittest
from target import find_closest_elements

class TestFindClosestElements(unittest.TestCase):
    def test_basic(self):
        self.assertEqual(find_closest_elements([1.0, 2.0, 3.9, 4.0, 5.0, 2.2]), (2.2, 3.9))

    def test_closest_at_start(self):
        self.assertEqual(find_closest_elements([1.0, 2.0, 3.0, 4.0, 5.0]), (1.0, 2.0))

    def test_closest_at_end(self):
        self.assertEqual(find_closest_elements([1.0, 2.0, 3.0, 4.0, 5.0, 5.1]), (5.0, 5.1))

    def test_all_same(self):
        self.assertEqual(find_closest_elements([1.0, 1.0, 1.0, 1.0, 1.0]), (1.0, 1.0))

    def test_empty_list(self):
        with self.assertRaises(ValueError):
            find_closest_elements([])

    def test_closest_in_middle(self):
        self.assertEqual(find_closest_elements([1.0, 1.1, 1.2, 1.3, 1.4]), (1.1, 1.2))

    def test_large_numbers(self):
        self.assertEqual(find_closest_elements([10.0, 20.0, 30.0, 40.0, 50.0]), (10.0, 20.0))

    def test_zeroes(self):
        self.assertEqual(find_closest_elements([0.0, 0.0, 0.0, 0.0, 0.0]), (0.0, 0.0))

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that find_closest_elements([1.0, 2.0, 3.0, 4.0, 5.0]) returns (1.0, 2.0)
# - test that find_closest_elements([1.0, 1.0, 1.0, 1.0, 1.0]) returns (1.0, 1.0)
# - test that find_closest_elements([]) raises ValueError when the input list is empty

### Function:
from typing import List, Tuple

def find_closest_elements(numbers: List[float]) -> Tuple[float, float]:
    """ From a supplied list of numbers (of length at least two) select and return two that are the closest to each
    other and return them in order (smaller number, larger number).
    >>> find_closest_elements([1.0, 2.0, 3.0, 4.0, 5.0, 2.2])
    (2.0, 2.2)
    >>> find_closest_elements([1.0, 2.0, 3.0, 4.0, 5.0, 2.0])
    (2.0, 2.0)
    """
    closest_pair = None
    distance = None

    for idx, elem in enumerate(numbers):
        for idx2, elem2 in enumerate(numbers):
            if idx != idx2:
                if distance is None:
                    distance = abs(elem - elem2)
                    closest_pair = tuple(sorted([elem, elem2]))
                else:
                    new_distance = abs(elem - elem2)
                    if new_distance < distance:
                        distance = new_distance
                        closest_pair = tuple(sorted([elem, elem2]))

    return closest_pair

### Current tests:
import unittest
from target import find_closest_elements

class TestFindClosestElements(unittest.TestCase):
    def test_basic(self):
        assert candidate([1.0, 2.0, 3.9, 4.0, 5.0, 2.2]) == (3.9, 4.0)

### Improved tests:


import unittest
from target import solve

class TestSolve(unittest.TestCase):
    def test_basic(self):
        self.assertEqual(solve("AsDf"), "aSdF")

    def test_numbers(self):
        self.assertEqual(solve('1234'), '4321')

    def test_letters(self):
        self.assertEqual(solve('abc'), 'ABC')

    def test_empty_string(self):
        self.assertEqual(solve(''), '')

    def test_special_characters(self):
        self.assertEqual(solve('#a@C'), '#A@c')

    def test_mixed_characters(self):
        self.assertEqual(solve('a1b2C'), 'A1B2c')

    def test_only_special_characters(self):
        self.assertEqual(solve('#@!'), '#@!')

    def test_single_character(self):
        self.assertEqual(solve('a'), 'A')

    def test_single_number(self):
        self.assertEqual(solve('1'), '1')

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that solve('1234') returns '4321'
# - test that solve('abc') returns 'ABC'
# - test that solve('') returns ''

### Function:
def solve(s):
    """You are given a string s.
    if s[i] is a letter, reverse its case from lower to upper or vise versa,
    otherwise keep it as it is.
    If the string contains no letters, reverse the string.
    The function should return the resulted string.
    Examples
    solve("1234") = "4321"
    solve("ab") = "AB"
    solve("#a@C") = "#A@c"
    """
    flg = 0
    idx = 0
    new_str = list(s)
    for i in s:
        if i.isalpha():
            new_str[idx] = i.swapcase()
            flg = 1
        idx += 1
    s = ""
    for i in new_str:
        s += i
    if flg == 0:
        return s[len(s)::-1]
    return s

### Current tests:
import unittest
from target import solve

class TestSolve(unittest.TestCase):
    def test_basic(self):
        assert candidate("AsDf") == "aSdF"

### Improved tests:

test that solve('1234') returns '4321'
test that solve('abc') returns 'ABC'
test that solve('') returns ''


import unittest
from target import sort_even

class TestSortEven(unittest.TestCase):
    def test_basic(self):
        self.assertEqual(tuple(sort_even([1, 2, 3])), tuple([1, 2, 3]))

    def test_sort_even_numbers(self):
        self.assertEqual(tuple(sort_even([5, 6, 3, 4])), tuple([3, 6, 5, 4]))

    def test_no_change(self):
        self.assertEqual(tuple(sort_even([1, 2, 3, 4, 5, 6])), tuple([1, 2, 3, 4, 5, 6]))

    def test_empty_list(self):
        self.assertEqual(tuple(sort_even([])), tuple([]))

    def test_duplicate_numbers(self):
        self.assertEqual(tuple(sort_even([1, 2, 2, 4])), tuple([1, 2, 2, 4]))

    def test_negative_numbers(self):
        self.assertEqual(tuple(sort_even([5, -1, 3, -4])), tuple([-4, -1, 3, 5]))

    def test_float_numbers(self):
        self.assertEqual(tuple(sort_even([1.5, 2.5, 3.5, 4.5])), tuple([1.5, 2.5, 3.5, 4.5]))

    def test_error_handling(self):
        with self.assertRaises(TypeError):
            sort_even([1, 'a', 3, 4])

    def test_non_numeric_values(self):
        with self.assertRaises(TypeError):
            sort_even([1, None, 3, 4])

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that sort_even([5, 6, 3, 4]) returns [3, 6, 5, 4]
# - test that sort_even([1, 2, 3, 4, 5, 6]) returns [1, 2, 3, 4, 5, 6]
# - test that sort_even([]) returns []

### Function:
def sort_even(l: list):
    """This function takes a list l and returns a list l' such that
    l' is identical to l in the odd indicies, while its values at the even indicies are equal
    to the values of the even indicies of l, but sorted.
    >>> sort_even([1, 2, 3])
    [1, 2, 3]
    >>> sort_even([5, 6, 3, 4])
    [3, 6, 5, 4]
    """
    evens = l[::2]
    odds = l[1::2]
    evens.sort()
    ans = []
    for e, o in zip(evens, odds):
        ans.extend([e, o])
    if len(evens) > len(odds):
        ans.append(evens[-1])
    return ans

### Current tests:
import unittest
from target import sort_even

class TestSortEven(unittest.TestCase):
    def test_basic(self):
        assert tuple(candidate([1, 2, 3])) == tuple([1, 2, 3])

### Improved tests:


import unittest
from target import correct_bracketing

class TestCorrectBracketing(unittest.TestCase):
    def test_empty_string(self):
        self.assertTrue(correct_bracketing(""))

    def test_basic(self):
        self.assertTrue(correct_bracketing("<>"))

    def test_opening_bracket_only(self):
        self.assertFalse(correct_bracketing("<"))

    def test_closing_bracket_only(self):
        self.assertFalse(correct_bracketing(">"))

    def test_multiple_opening_brackets(self):
        self.assertFalse(correct_bracketing("<<"))

    def test_multiple_closing_brackets(self):
        self.assertFalse(correct_bracketing(">>"))

    def test_valid_bracketing(self):
        self.assertTrue(correct_bracketing("<<><>>"))

    def test_invalid_bracketing(self):
        self.assertFalse(correct_bracketing("><<>"))

    def test_non_bracket_characters(self):
        self.assertFalse(correct_bracketing("abc"))

    def test_mixed_valid_and_invalid(self):
        self.assertFalse(correct_bracketing("abc<>"))

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that correct_bracketing("") returns True
# - test that correct_bracketing("<>") returns True
# - test that correct_bracketing("<") returns False

### Function:
def correct_bracketing(brackets: str):
    """ brackets is a string of "<" and ">".
    return True if every opening bracket has a corresponding closing bracket.

    >>> correct_bracketing("<")
    False
    >>> correct_bracketing("<>")
    True
    >>> correct_bracketing("<<><>>")
    True
    >>> correct_bracketing("><<>")
    False
    """
    depth = 0
    for b in brackets:
        if b == "<":
            depth += 1
        else:
            depth -= 1
        if depth < 0:
            return False
    return depth == 0

### Current tests:
import unittest
from target import correct_bracketing

class TestCorrectBracketing(unittest.TestCase):
    def test_basic(self):
        assert candidate("<>")

### Improved tests:


import unittest
from target import add_elements

class TestAddElements(unittest.TestCase):
    def test_basic(self):
        self.assertEqual(add_elements([1,-2,-3,41,57,76,87,88,99], 3), -4)

    def test_add_elements_with_two_digit_numbers(self):
        self.assertEqual(add_elements([10, 20, 30], 2), 30)

    def test_add_elements_with_three_digit_numbers(self):
        self.assertEqual(add_elements([1000, 2000, 3000], 3), 0)

    def test_add_elements_with_empty_array(self):
        with self.assertRaises(IndexError):
            add_elements([], 1)

    def test_add_elements_with_large_array(self):
        self.assertEqual(add_elements([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 100, 1000], 12), 55)

    def test_add_elements_with_zeros(self):
        self.assertEqual(add_elements([0, 0, 0, 0, 0, 0, 0, 0, 0, 0], 10), 0)

    def test_add_elements_with_large_numbers(self):
        self.assertEqual(add_elements([100, 200, 300, 400, 500, 600, 700, 800, 900, 1000], 10), 0)

    def test_add_elements_with_k_equal_to_array_length(self):
        self.assertEqual(add_elements([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], 10), 55)

    def test_add_elements_with_k_less_than_array_length(self):
        self.assertEqual(add_elements([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], 5), 15)

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that add_elements([10, 20, 30], 2) returns 30
# - test that add_elements([1000, 2000, 3000], 3) returns 0
# - test that add_elements([], 1) raises IndexError when accessing the array

### Function:
def add_elements(arr, k):
    """
    Given a non-empty array of integers arr and an integer k, return
    the sum of the elements with at most two digits from the first k elements of arr.

    Example:

        Input: arr = [111,21,3,4000,5,6,7,8,9], k = 4
        Output: 24 # sum of 21 + 3

    Constraints:
        1. 1 <= len(arr) <= 100
        2. 1 <= k <= len(arr)
    """
    return sum(elem for elem in arr[:k] if len(str(elem)) <= 2)

### Current tests:
import unittest
from target import add_elements

class TestAddElements(unittest.TestCase):
    def test_basic(self):
        assert candidate([1,-2,-3,41,57,76,87,88,99], 3) == -4

### Improved tests:


import unittest
from target import make_a_pile

class TestMakeAPile(unittest.TestCase):
    def test_basic(self):
        self.assertEqual(make_a_pile(3), [3, 5, 7])

    def test_even_input(self):
        self.assertEqual(make_a_pile(5), [5, 7, 9, 11, 13])
        self.assertEqual(make_a_pile(2), [2, 4])

    def test_negative_input(self):
        with self.assertRaises(ValueError):
            make_a_pile(-1)
        with self.assertRaises(ValueError):
            make_a_pile(-5)

    def test_zero_input(self):
        self.assertEqual(make_a_pile(0), [])

    def test_non_integer_input(self):
        with self.assertRaises(TypeError):
            make_a_pile(1.5)

    def test_single_level(self):
        self.assertEqual(make_a_pile(1), [1])

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that make_a_pile(5) returns [5, 7, 9, 11, 13]
# - test that make_a_pile(2) returns [2, 4]
# - test that make_a_pile(-1) raises ValueError when input is negative

### Function:
def make_a_pile(n):
    """
    Given a positive integer n, you have to make a pile of n levels of stones.
    The first level has n stones.
    The number of stones in the next level is:
        - the next odd number if n is odd.
        - the next even number if n is even.
    Return the number of stones in each level in a list, where element at index
    i represents the number of stones in the level (i+1).

    Examples:
    >>> make_a_pile(3)
    [3, 5, 7]
    """
    return [n + 2*i for i in range(n)]

### Current tests:
import unittest
from target import make_a_pile

class TestMakeAPile(unittest.TestCase):
    def test_basic(self):
        assert candidate(3) == [3, 5, 7], "Test 3"

### Improved tests:


import unittest
from target import simplify

class TestSimplify(unittest.TestCase):
    def test_basic(self):
        self.assertTrue(simplify("1/5", "5/1"))

    def test_simplify_true(self):
        self.assertTrue(simplify('1/2', '2/1'))

    def test_simplify_false(self):
        self.assertFalse(simplify('1/3', '2/1'))

    def test_zero_numerator(self):
        self.assertTrue(simplify('0/1', '1/1'))

    def test_division_by_zero(self):
        with self.assertRaises(ZeroDivisionError):
            simplify('1/0', '1/1')

    def test_equal_fractions(self):
        self.assertTrue(simplify('10/10', '1/1'))

    def test_unequal_fractions(self):
        self.assertFalse(simplify('7/3', '2/1'))

    def test_large_numerators(self):
        self.assertFalse(simplify('123/456', '789/1011'))

    def test_large_denominators(self):
        self.assertFalse(simplify('1/1234', '1/5678'))

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that simplify('1/2', '2/1') returns True
# - test that simplify('1/3', '2/1') returns False
# - test that simplify('0/1', '1/1') returns True

### Function:
def simplify(x, n):
    """Your task is to implement a function that will simplify the expression
    x * n. The function returns True if x * n evaluates to a whole number and False
    otherwise. Both x and n, are string representation of a fraction, and have the following format,
    <numerator>/<denominator> where both numerator and denominator are positive whole numbers.

    You can assume that x, and n are valid fractions, and do not have zero as denominator.

    simplify("1/5", "5/1") = True
    simplify("1/6", "2/1") = False
    simplify("7/10", "10/2") = False
    """
    a, b = x.split("/")
    c, d = n.split("/")
    numerator = int(a) * int(c)
    denom = int(b) * int(d)
    if (numerator/denom == int(numerator/denom)):
        return True
    return False

### Current tests:
import unittest
from target import simplify

class TestSimplify(unittest.TestCase):
    def test_basic(self):
        assert candidate("1/5", "5/1") == True, 'test1'

### Improved tests:


import unittest
from target import any_int

class TestAnyInt(unittest.TestCase):
    def test_basic(self):
        self.assertTrue(any_int(2, 3, 1))

    def test_any_int_returns_true(self):
        self.assertTrue(any_int(5, 2, 7))

    def test_any_int_returns_false(self):
        self.assertFalse(any_int(3, 2, 2))

    def test_any_int_with_floats(self):
        self.assertFalse(any_int(3.6, -2.2, 2))

    def test_any_int_with_negative_numbers(self):
        self.assertTrue(any_int(3, -2, 1))

    def test_any_int_with_zero(self):
        self.assertTrue(any_int(0, 0, 0))

    def test_any_int_with_negative_numbers_and_zero(self):
        self.assertFalse(any_int(-1, -2, -3))

    def test_any_int_with_floats_and_integers(self):
        self.assertFalse(any_int(1.5, 2.5, 4.0))

    def test_any_int_with_same_numbers(self):
        self.assertFalse(any_int(2, 2, 2))

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that any_int(5, 2, 7) returns True
# - test that any_int(3, 2, 2) returns False
# - test that any_int(3.6, -2.2, 2) returns False

### Function:
def any_int(x, y, z):
    '''
    Create a function that takes 3 numbers.
    Returns true if one of the numbers is equal to the sum of the other two, and all numbers are integers.
    Returns false in any other cases.

    Examples
    any_int(5, 2, 7) ➞ True

    any_int(3, 2, 2) ➞ False

    any_int(3, -2, 1) ➞ True

    any_int(3.6, -2.2, 2) ➞ False

    '''

    if isinstance(x,int) and isinstance(y,int) and isinstance(z,int):
        if (x+y==z) or (x+z==y) or (y+z==x):
            return True
        return False
    return False

### Current tests:
import unittest
from target import any_int

class TestAnyInt(unittest.TestCase):
    def test_basic(self):
        assert candidate(2, 3, 1)==True, "This prints if this assert fails 1 (good for debugging!)"

### Improved tests:


import unittest
from target import find_zero, poly
import math

class TestFindZero(unittest.TestCase):
    def test_basic(self):
        coeffs = [1, 2]
        solution = find_zero(coeffs)
        self.assertAlmostEqual(poly(coeffs, solution), 0, places=4)

    def test_polynomial(self):
        coeffs = [-6, 11, -6, 1]
        solution = find_zero(coeffs)
        self.assertAlmostEqual(poly(coeffs, solution), 0, places=4)

    def test_all_zeros(self):
        coeffs = [0, 0, 0]
        with self.assertRaises(ValueError):
            find_zero(coeffs)

    def test_empty_list(self):
        coeffs = []
        with self.assertRaises(IndexError):
            find_zero(coeffs)

    def test_odd_coefficients(self):
        coeffs = [1, 2, 3]
        with self.assertRaises(ValueError):
            find_zero(coeffs)

    def test_find_zero(self):
        coeffs = [1, 2]
        solution = find_zero(coeffs)
        self.assertAlmostEqual(solution, -0.5, places=4)

    def test_find_zero_polynomial(self):
        coeffs = [-6, 11, -6, 1]
        solution = find_zero(coeffs)
        self.assertAlmostEqual(solution, 1.0, places=4)

    def test_find_zero_high_degree(self):
        coeffs = [1, 2, 3, 4, 5]
        with self.assertRaises(ValueError):
            find_zero(coeffs)

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that find_zero([1, 2]) returns -0.5
# - test that find_zero([-6, 11, -6, 1]) returns 1.0
# - test that find_zero([0, 0, 0]) raises ValueError when the list of coefficients is all zeros

### Function:
import math

def poly(xs: list, x: float):
    """
    Evaluates polynomial with coefficients xs at point x.
    return xs[0] + xs[1] * x + xs[1] * x^2 + .... xs[n] * x^n
    """
    return sum([coeff * math.pow(x, i) for i, coeff in enumerate(xs)])

def find_zero(xs: list):
    """ xs are coefficients of a polynomial.
    find_zero find x such that poly(x) = 0.
    find_zero returns only only zero point, even if there are many.
    Moreover, find_zero only takes list xs having even number of coefficients
    and largest non zero coefficient as it guarantees
    a solution.
    >>> round(find_zero([1, 2]), 2) # f(x) = 1 + 2x
    -0.5
    >>> round(find_zero([-6, 11, -6, 1]), 2) # (x - 1) * (x - 2) * (x - 3) = -6 + 11x - 6x^2 + x^3
    1.0
    """
    begin, end = -1., 1.
    while poly(xs, begin) * poly(xs, end) > 0:
        begin *= 2.0
        end *= 2.0
    while end - begin > 1e-10:
        center = (begin + end) / 2.0
        if poly(xs, center) * poly(xs, begin) > 0:
            begin = center
        else:
            end = center
    return begin

### Current tests:
import unittest
from target import find_zero

class TestFindZero(unittest.TestCase):
    def test_basic(self):
        assert math.fabs(poly(coeffs, solution)) < 1e-4

### Improved tests:


import unittest
from target import mean_absolute_deviation

class TestMeanAbsoluteDeviation(unittest.TestCase):
    def test_basic(self):
        self.assertAlmostEqual(mean_absolute_deviation([1.0, 2.0, 3.0]), 2.0/3.0)

    def test_constant(self):
        self.assertAlmostEqual(mean_absolute_deviation([1.0, 1.0, 1.0]), 0.0)

    def test_symmetric(self):
        self.assertAlmostEqual(mean_absolute_deviation([-1.0, 0.0, 1.0]), 1.0)

    def test_empty(self):
        with self.assertRaises(ZeroDivisionError):
            mean_absolute_deviation([])

    def test_single_element(self):
        self.assertAlmostEqual(mean_absolute_deviation([1.0]), 0.0)

    def test_sequence(self):
        self.assertAlmostEqual(mean_absolute_deviation([1.0, 2.0, 3.0, 4.0, 5.0]), 2.0)

    def test_zeros(self):
        self.assertAlmostEqual(mean_absolute_deviation([0.0, 0.0, 0.0]), 0.0)

    def test_negative(self):
        self.assertAlmostEqual(mean_absolute_deviation([-10.0, -5.0, 0.0, 5.0, 10.0]), 5.0)

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that mean_absolute_deviation([1.0, 1.0, 1.0]) returns 0.0
# - test that mean_absolute_deviation([-1.0, 0.0, 1.0]) returns 1.0
# - test that mean_absolute_deviation([]) raises ZeroDivisionError when calculating the mean

### Function:
from typing import List

def mean_absolute_deviation(numbers: List[float]) -> float:
    """ For a given list of input numbers, calculate Mean Absolute Deviation
    around the mean of this dataset.
    Mean Absolute Deviation is the average absolute difference between each
    element and a centerpoint (mean in this case):
    MAD = average | x - x_mean |
    >>> mean_absolute_deviation([1.0, 2.0, 3.0, 4.0])
    1.0
    """
    mean = sum(numbers) / len(numbers)
    return sum(abs(x - mean) for x in numbers) / len(numbers)

### Current tests:
import unittest
from target import mean_absolute_deviation

class TestMeanAbsoluteDeviation(unittest.TestCase):
    def test_basic(self):
        assert abs(candidate([1.0, 2.0, 3.0]) - 2.0/3.0) < 1e-6

### Improved tests:


import unittest
from target import truncate_number

class TestTruncateNumber(unittest.TestCase):
    def test_basic(self):
        self.assertEqual(truncate_number(3.5), 0.5)

    def test_zero(self):
        self.assertEqual(truncate_number(0.0), 0.0)

    def test_negative(self):
        self.assertEqual(truncate_number(-3.5), 0.5)

    def test_non_numeric_input(self):
        with self.assertRaises(TypeError):
            truncate_number('a')

    def test_negative_decimal(self):
        self.assertEqual(truncate_number(-1.5), 0.5)

    def test_small_decimal(self):
        self.assertAlmostEqual(truncate_number(0.0001), 0.0001)

    def test_infinity(self):
        self.assertEqual(truncate_number(float('inf')), 0.0)

    def test_large_decimal(self):
        self.assertAlmostEqual(truncate_number(12345.6789), 0.6789)

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that truncate_number(0.0) returns 0.0
# - test that truncate_number(-3.5) returns 0.5
# - test that truncate_number('a') raises TypeError when input is not a number

### Function:
def truncate_number(number: float) -> float:
    """ Given a positive floating point number, it can be decomposed into
    and integer part (largest integer smaller than given number) and decimals
    (leftover part always smaller than 1).

    Return the decimal part of the number.
    >>> truncate_number(3.5)
    0.5
    """
    return number % 1.0

### Current tests:
import unittest
from target import truncate_number

class TestTruncateNumber(unittest.TestCase):
    def test_basic(self):
        assert candidate(3.5) == 0.5

### Improved tests:


import unittest
from target import unique_digits

class TestUniqueDigits(unittest.TestCase):
    def test_basic(self):
        self.assertEqual(unique_digits([15, 33, 1422, 1]), [1, 15, 33])

    def test_no_even_digits(self):
        self.assertEqual(unique_digits([10, 20, 30]), [])

    def test_all_odd_digits(self):
        self.assertEqual(unique_digits([1, 3, 5, 7]), [1, 3, 5, 7])

    def test_empty_list(self):
        self.assertEqual(unique_digits([]), [])

    def test_all_even_digits(self):
        self.assertEqual(unique_digits([0, 2, 4, 6, 8]), [])

    def test_all_odd_digits_with_tens(self):
        self.assertEqual(unique_digits([11, 13, 15, 17, 19]), [11, 13, 15, 17, 19])

    def test_all_odd_digits_with_hundreds(self):
        self.assertEqual(unique_digits([100, 200, 300, 400, 500]), [])

    def test_mixed_numbers(self):
        self.assertEqual(unique_digits([15, 33, 1422, 1, 10, 20, 30]), [1, 15, 33])

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that unique_digits([10, 20, 30]) returns []
# - test that unique_digits([1, 3, 5, 7]) returns [1, 3, 5, 7]
# - test that unique_digits([]) returns []

### Function:
def unique_digits(x):
    """Given a list of positive integers x. return a sorted list of all
    elements that hasn't any even digit.

    Note: Returned list should be sorted in increasing order.

    For example:
    >>> unique_digits([15, 33, 1422, 1])
    [1, 15, 33]
    >>> unique_digits([152, 323, 1422, 10])
    []
    """
    odd_digit_elements = []
    for i in x:
        if all (int(c) % 2 == 1 for c in str(i)):
            odd_digit_elements.append(i)
    return sorted(odd_digit_elements)

### Current tests:
import unittest
from target import unique_digits

class TestUniqueDigits(unittest.TestCase):
    def test_basic(self):
        assert candidate([15, 33, 1422, 1]) == [1, 15, 33]

### Improved tests:


import unittest
from target import is_sorted

class TestIsSorted(unittest.TestCase):
    def test_single_element(self):
        self.assertTrue(is_sorted([5]))

    def test_ascending_order(self):
        self.assertTrue(is_sorted([1, 2, 3, 4, 5]))

    def test_descending_order(self):
        self.assertFalse(is_sorted([5, 4, 3, 2, 1]))

    def test_unsorted(self):
        self.assertFalse(is_sorted([1, 3, 2, 4, 5]))

    def test_duplicates_allowed(self):
        self.assertTrue(is_sorted([1, 2, 2, 3, 3, 4]))

    def test_duplicates_not_allowed(self):
        self.assertFalse(is_sorted([1, 2, 2, 2, 3, 4]))

    def test_unsorted_with_duplicates(self):
        self.assertFalse(is_sorted([1, 3, 5, 7, 9, 2, 4, 6, 8]))

    def test_sorted_with_duplicates(self):
        self.assertTrue(is_sorted([1, 2, 2, 3, 3, 3, 4]))

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that is_sorted([1, 2, 3, 4, 5]) returns True
# - test that is_sorted([1, 3, 2, 4, 5]) returns False
# - test that is_sorted([1, 2, 2, 2, 3, 4]) returns False

### Function:
def is_sorted(lst):
    '''
    Given a list of numbers, return whether or not they are sorted
    in ascending order. If list has more than 1 duplicate of the same
    number, return False. Assume no negative numbers and only integers.

    Examples
    is_sorted([5]) ➞ True
    is_sorted([1, 2, 3, 4, 5]) ➞ True
    is_sorted([1, 3, 2, 4, 5]) ➞ False
    is_sorted([1, 2, 3, 4, 5, 6]) ➞ True
    is_sorted([1, 2, 3, 4, 5, 6, 7]) ➞ True
    is_sorted([1, 3, 2, 4, 5, 6, 7]) ➞ False
    is_sorted([1, 2, 2, 3, 3, 4]) ➞ True
    is_sorted([1, 2, 2, 2, 3, 4]) ➞ False
    '''
    count_digit = dict([(i, 0) for i in lst])
    for i in lst:
        count_digit[i]+=1
    if any(count_digit[i] > 2 for i in lst):
        return False
    if all(lst[i-1] <= lst[i] for i in range(1, len(lst))):
        return True
    else:
        return False

### Current tests:
import unittest
from target import is_sorted

class TestIsSorted(unittest.TestCase):
    def test_basic(self):
        assert candidate([5]) == True

### Improved tests:


import unittest
from target import get_odd_collatz

class TestGetOddCollatz(unittest.TestCase):
    def test_basic(self):
        self.assertEqual(get_odd_collatz(14), [1, 5, 7, 11, 13, 17])

    def test_single_element(self):
        self.assertEqual(get_odd_collatz(1), [1])

    def test_even_input(self):
        self.assertEqual(get_odd_collatz(10), [1, 5, 7, 13, 17, 19, 31])

    def test_odd_input(self):
        self.assertEqual(get_odd_collatz(5), [1, 5])

    def test_zero_input(self):
        with self.assertRaises(ZeroDivisionError):
            get_odd_collatz(0)

    def test_negative_input(self):
        with self.assertRaises(ValueError):
            get_odd_collatz(-1)

    def test_non_integer_input(self):
        with self.assertRaises(TypeError):
            get_odd_collatz(3.5)

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that get_odd_collatz(1) returns [1]
# - test that get_odd_collatz(5) returns [1, 5]
# - test that get_odd_collatz(10) returns [1, 5, 7, 13, 17, 19, 31]

### Function:
def get_odd_collatz(n):
    """
    Given a positive integer n, return a sorted list that has the odd numbers in collatz sequence.

    The Collatz conjecture is a conjecture in mathematics that concerns a sequence defined
    as follows: start with any positive integer n. Then each term is obtained from the
    previous term as follows: if the previous term is even, the next term is one half of
    the previous term. If the previous term is odd, the next term is 3 times the previous
    term plus 1. The conjecture is that no matter what value of n, the sequence will always reach 1.

    Note:
        1. Collatz(1) is [1].
        2. returned list sorted in increasing order.

    For example:
    get_odd_collatz(5) returns [1, 5] # The collatz sequence for 5 is [5, 16, 8, 4, 2, 1], so the odd numbers are only 1, and 5.
    """
    if n%2==0:
        odd_collatz = []
    else:
        odd_collatz = [n]
    while n > 1:
        if n % 2 == 0:
            n = n/2
        else:
            n = n*3 + 1

        if n%2 == 1:
            odd_collatz.append(int(n))

    return sorted(odd_collatz)

### Current tests:
import unittest
from target import get_odd_collatz

class TestGetOddCollatz(unittest.TestCase):
    def test_basic(self):
        assert candidate(14) == [1, 5, 7, 11, 13, 17]

### Improved tests:


import unittest
from target import even_odd_palindrome

class TestEvenOddPalindrome(unittest.TestCase):
    def test_basic(self):
        self.assertEqual(even_odd_palindrome(123), (8, 13))

    def test_single_digit(self):
        self.assertEqual(even_odd_palindrome(1), (0, 1))

    def test_two_digit(self):
        self.assertEqual(even_odd_palindrome(10), (4, 6))

    def test_large_input(self):
        self.assertEqual(even_odd_palindrome(1000), (134, 267))

    def test_zero(self):
        with self.assertRaises(ValueError):
            even_odd_palindrome(0)

    def test_negative(self):
        with self.assertRaises(ValueError):
            even_odd_palindrome(-1)

    def test_large_odd_input(self):
        self.assertEqual(even_odd_palindrome(1001), (135, 268))

    def test_edge_case(self):
        self.assertEqual(even_odd_palindrome(1), (0, 1))

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that even_odd_palindrome(1) returns (0, 1)
# - test that even_odd_palindrome(10) returns (4, 6)
# - test that even_odd_palindrome(1000) returns (134, 267)

### Function:
def even_odd_palindrome(n):
    """
    Given a positive integer n, return a tuple that has the number of even and odd
    integer palindromes that fall within the range(1, n), inclusive.

    Example 1:

        Input: 3
        Output: (1, 2)
        Explanation:
        Integer palindrome are 1, 2, 3. one of them is even, and two of them are odd.

    Example 2:

        Input: 12
        Output: (4, 6)
        Explanation:
        Integer palindrome are 1, 2, 3, 4, 5, 6, 7, 8, 9, 11. four of them are even, and 6 of them are odd.

    Note:
        1. 1 <= n <= 10^3
        2. returned tuple has the number of even and odd integer palindromes respectively.
    """
    def is_palindrome(n):
        return str(n) == str(n)[::-1]

    even_palindrome_count = 0
    odd_palindrome_count = 0

    for i in range(1, n+1):
        if i%2 == 1 and is_palindrome(i):
                odd_palindrome_count += 1
        elif i%2 == 0 and is_palindrome(i):
            even_palindrome_count += 1
    return (even_palindrome_count, odd_palindrome_count)

### Current tests:
import unittest
from target import even_odd_palindrome

class TestEvenOddPalindrome(unittest.TestCase):
    def test_basic(self):
        assert candidate(123) == (8, 13)

### Improved tests:


import unittest
from target import is_multiply_prime

class TestIsMultiplyPrime(unittest.TestCase):
    def test_multiply_of_three_primes(self):
        self.assertTrue(is_multiply_prime(30))

    def test_not_multiply_of_three_primes(self):
        self.assertFalse(is_multiply_prime(2))

    def test_not_multiply_of_three_primes_large(self):
        self.assertFalse(is_multiply_prime(100))

    def test_zero(self):
        self.assertFalse(is_multiply_prime(0))

    def test_one(self):
        self.assertFalse(is_multiply_prime(1))

    def test_large_input(self):
        self.assertFalse(is_multiply_prime(101))

    def test_non_integer_input(self):
        with self.assertRaises(TypeError):
            is_multiply_prime("a")

    def test_negative_input(self):
        self.assertFalse(is_multiply_prime(-1))

    def test_float_input(self):
        with self.assertRaises(TypeError):
            is_multiply_prime(1.5)

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that is_multiply_prime(30) returns True
# - test that is_multiply_prime(2) returns False
# - test that is_multiply_prime(100) returns False

### Function:
def is_multiply_prime(a):
    """Write a function that returns true if the given number is the multiplication of 3 prime numbers
    and false otherwise.
    Knowing that (a) is less then 100.
    Example:
    is_multiply_prime(30) == True
    30 = 2 * 3 * 5
    """
    def is_prime(n):
        for j in range(2,n):
            if n%j == 0:
                return False
        return True

    for i in range(2,101):
        if not is_prime(i): continue
        for j in range(2,101):
            if not is_prime(j): continue
            for k in range(2,101):
                if not is_prime(k): continue
                if i*j*k == a: return True
    return False

### Current tests:
import unittest
from target import is_multiply_prime

class TestIsMultiplyPrime(unittest.TestCase):
    def test_basic(self):
        assert candidate(5) == False

### Improved tests:


import unittest
from target import longest

class TestLongest(unittest.TestCase):
    def test_basic(self):
        self.assertIsNone(longest([]))

    def test_single_string(self):
        self.assertEqual(longest(['a']), 'a')

    def test_multiple_strings(self):
        self.assertEqual(longest(['a', 'bb', 'ccc']), 'ccc')

    def test_multiple_strings_same_length(self):
        self.assertEqual(longest(['a', 'a', 'a']), 'a')

    def test_empty_strings(self):
        self.assertEqual(longest(['', 'a', 'bb']), 'bb')

    def test_all_empty_strings(self):
        self.assertEqual(longest(['', '', '']), '')

    def test_strings_of_increasing_length(self):
        self.assertEqual(longest(['abc', 'abcd', 'abcde']), 'abcde')

    def test_strings_of_same_length(self):
        self.assertEqual(longest(['abc', 'def', 'ghi']), 'abc')

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that longest(['a', 'bb', 'ccc']) returns 'ccc'
# - test that longest(['abc', 'def', 'ghi']) returns 'abc'
# - test that longest(['', 'a', 'bb']) returns 'bb'

### Function:
from typing import List, Optional

def longest(strings: List[str]) -> Optional[str]:
    """ Out of list of strings, return the longest one. Return the first one in case of multiple
    strings of the same length. Return None in case the input list is empty.
    >>> longest([])

    >>> longest(['a', 'b', 'c'])
    'a'
    >>> longest(['a', 'bb', 'ccc'])
    'ccc'
    """
    if not strings:
        return None

    maxlen = max(len(x) for x in strings)
    for s in strings:
        if len(s) == maxlen:
            return s

### Current tests:
import unittest
from target import longest

class TestLongest(unittest.TestCase):
    def test_basic(self):
        assert candidate([]) == None

### Improved tests:


import unittest
from target import prime_length

class TestPrimeLength(unittest.TestCase):
    def test_empty_string(self):
        self.assertFalse(prime_length(''))

    def test_composite_length(self):
        self.assertFalse(prime_length('a' * 10))

    def test_prime_length(self):
        self.assertTrue(prime_length('a' * 7))

    def test_larger_prime_length(self):
        self.assertTrue(prime_length('a' * 11))

    def test_non_string_input(self):
        with self.assertRaises(TypeError):
            prime_length(123)

    def test_single_character_string(self):
        self.assertFalse(prime_length('a'))

    def test_large_input_string(self):
        self.assertTrue(prime_length('a' * 23))

    def test_basic(self):
        self.assertTrue(prime_length('Hello'))

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that prime_length('') returns False
# - test that prime_length('a' * 10) returns False
# - test that prime_length('a' * 7) returns True

### Function:
def prime_length(string):
    """Write a function that takes a string and returns True if the string
    length is a prime number or False otherwise
    Examples
    prime_length('Hello') == True
    prime_length('abcdcba') == True
    prime_length('kittens') == True
    prime_length('orange') == False
    """
    l = len(string)
    if l == 0 or l == 1:
        return False
    for i in range(2, l):
        if l % i == 0:
            return False
    return True

### Current tests:
import unittest
from target import prime_length

class TestPrimeLength(unittest.TestCase):
    def test_basic(self):
        assert candidate('Hello') == True

### Improved tests:


import unittest
from target import add

class TestAdd(unittest.TestCase):
    def test_basic(self):
        self.assertEqual(add([4, 2]), 2)

    def test_add_with_multiple_even_elements(self):
        self.assertEqual(add([4, 2, 6, 7]), 2)

    def test_add_with_consecutive_even_elements(self):
        self.assertEqual(add([1, 2, 3, 4]), 2)

    def test_add_with_only_odd_elements(self):
        self.assertEqual(add([1, 3, 5, 7]), 0)

    def test_add_with_only_even_elements(self):
        self.assertEqual(add([2, 4, 6, 8]), 4)

    def test_add_with_mixed_data_types(self):
        self.assertEqual(add([10, 'a', 20, 'b']), 10)

    def test_add_with_empty_list(self):
        with self.assertRaises(ValueError):
            add([])

    def test_add_with_single_element(self):
        self.assertEqual(add([5]), 0)

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that add([4, 2, 6, 7]) returns 2
# - test that add([1, 2, 3, 4]) returns 2
# - test that add([]) raises ValueError when input list is empty

### Function:
def add(lst):
    """Given a non-empty list of integers lst. add the even elements that are at odd indices..

    Examples:
        add([4, 2, 6, 7]) ==> 2
    """
    return sum([lst[i] for i in range(1, len(lst), 2) if lst[i]%2 == 0])

### Current tests:
import unittest
from target import add

class TestAdd(unittest.TestCase):
    def test_basic(self):
        assert candidate([4, 88]) == 88

### Improved tests:


import unittest
from target import encode

class TestEncode(unittest.TestCase):
    def test_basic(self):
        self.assertEqual(encode('TEST'), 'tgst')

    def test_message(self):
        self.assertEqual(encode('This is a message'), 'tHKS KS C MGSSCGG')

    def test_vowels(self):
        self.assertEqual(encode('aeiouAEIOU'), 'cgkosCGKOS')

    def test_empty(self):
        self.assertEqual(encode(''), '')

    def test_hello_world(self):
        self.assertEqual(encode('Hello World'), 'hEllO wOrld')

    def test_lowercase_alphabet(self):
        self.assertEqual(encode('abcdefghijklmnopqrstuvwxyz'), 'ABCDEFGHIJKLMNOPQRSTUVWXYZ')

    def test_uppercase_alphabet(self):
        self.assertEqual(encode('ABCDEFGHIJKLMNOPQRSTUVWXYZ'), 'abcdefghijklmnopqrstuvwxyz')

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that encode('This is a message') returns 'tHKS KS C MGSSCGG'
# - test that encode('aeiouAEIOU') returns 'cgkosCGKOS'
# - test that encode('') returns ''

### Function:
def encode(message):
    """
    Write a function that takes a message, and encodes in such a
    way that it swaps case of all letters, replaces all vowels in
    the message with the letter that appears 2 places ahead of that
    vowel in the english alphabet.
    Assume only letters.

    Examples:
    >>> encode('test')
    'TGST'
    >>> encode('This is a message')
    'tHKS KS C MGSSCGG'
    """
    vowels = "aeiouAEIOU"
    vowels_replace = dict([(i, chr(ord(i) + 2)) for i in vowels])
    message = message.swapcase()
    return ''.join([vowels_replace[i] if i in vowels else i for i in message])

### Current tests:
import unittest
from target import encode

class TestEncode(unittest.TestCase):
    def test_basic(self):
        assert candidate('TEST') == 'tgst', "This prints if this assert fails 1 (good for debugging!)"

### Improved tests:


import unittest
from target import has_close_elements

class TestHasCloseElements(unittest.TestCase):
    def test_basic(self):
        self.assertTrue(has_close_elements([1.0, 2.0, 3.9, 4.0, 5.0, 2.2], 0.3))

    def test_no_close_elements(self):
        self.assertFalse(has_close_elements([1.0, 2.0, 3.0], 0.5))

    def test_close_elements(self):
        self.assertTrue(has_close_elements([1.0, 1.1], 0.2))

    def test_empty_list(self):
        self.assertFalse(has_close_elements([], 0.5))

    def test_large_list(self):
        self.assertTrue(has_close_elements([1.0, 2.0, 3.0, 4.0, 5.0, 2.0, 2.01], 0.1))

    def test_list_with_close_elements(self):
        self.assertTrue(has_close_elements([1.0, 1.1, 1.2, 1.3, 1.4, 1.5], 0.2))

    def test_list_with_no_close_elements(self):
        self.assertFalse(has_close_elements([1.0, 2.0, 3.0, 4.0, 5.0, 6.0], 0.5))

    def test_list_with_negative_numbers(self):
        self.assertTrue(has_close_elements([-1.0, -1.1], 0.2))

    def test_list_with_zero(self):
        self.assertTrue(has_close_elements([0.0, 0.1], 0.2))

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that has_close_elements([1.0, 2.0, 3.0], 0.5) returns False
# - test that has_close_elements([1.0, 1.1], 0.2) returns True
# - test that has_close_elements([], 0.5) returns False

### Function:
from typing import List

def has_close_elements(numbers: List[float], threshold: float) -> bool:
    """ Check if in given list of numbers, are any two numbers closer to each other than
    given threshold.
    >>> has_close_elements([1.0, 2.0, 3.0], 0.5)
    False
    >>> has_close_elements([1.0, 2.8, 3.0, 4.0, 5.0, 2.0], 0.3)
    True
    """
    for idx, elem in enumerate(numbers):
        for idx2, elem2 in enumerate(numbers):
            if idx != idx2:
                distance = abs(elem - elem2)
                if distance < threshold:
                    return True

    return False

### Current tests:
import unittest
from target import has_close_elements

class TestHasCloseElements(unittest.TestCase):
    def test_basic(self):
        assert candidate([1.0, 2.0, 3.9, 4.0, 5.0, 2.2], 0.3) == True

### Improved tests:


import unittest
from target import generate_integers

class TestGenerateIntegers(unittest.TestCase):
    def test_basic(self):
        self.assertEqual(generate_integers(2, 10), [2, 4, 6, 8])

    def test_even_range(self):
        self.assertEqual(generate_integers(2, 8), [2, 4, 6, 8])

    def test_reversed_range(self):
        self.assertEqual(generate_integers(8, 2), [2, 4, 6, 8])

    def test_out_of_range(self):
        self.assertEqual(generate_integers(10, 14), [])

    def test_zero_lower_bound(self):
        self.assertEqual(generate_integers(0, 10), [2, 4, 6, 8])

    def test_equal_bounds(self):
        self.assertEqual(generate_integers(5, 5), [])

    def test_negative_lower_bound(self):
        self.assertEqual(generate_integers(-1, 10), [2, 4, 6, 8])

    def test_negative_upper_bound(self):
        self.assertEqual(generate_integers(2, -1), [])

    def test_single_even_number(self):
        self.assertEqual(generate_integers(2, 2), [2])

    def test_single_odd_number(self):
        self.assertEqual(generate_integers(3, 3), [])

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that generate_integers(2, 8) returns [2, 4, 6, 8]
# - test that generate_integers(10, 14) returns []
# - test that generate_integers(8, 2) returns [2, 4, 6, 8]

### Function:
def generate_integers(a, b):
    """
    Given two positive integers a and b, return the even digits between a
    and b, in ascending order.

    For example:
    generate_integers(2, 8) => [2, 4, 6, 8]
    generate_integers(8, 2) => [2, 4, 6, 8]
    generate_integers(10, 14) => []
    """
    lower = max(2, min(a, b))
    upper = min(8, max(a, b))

    return [i for i in range(lower, upper+1) if i % 2 == 0]

### Current tests:
import unittest
from target import generate_integers

class TestGenerateIntegers(unittest.TestCase):
    def test_basic(self):
        assert candidate(2, 10) == [2, 4, 6, 8], "Test 1"

### Improved tests:


import unittest
from target import closest_integer

class TestClosestInteger(unittest.TestCase):
    def test_basic(self):
        self.assertEqual(closest_integer("10"), 10, "Test 1")

    def test_closest_integer_below(self):
        self.assertEqual(closest_integer("15.3"), 15, "Test 2")

    def test_closest_integer_above(self):
        self.assertEqual(closest_integer("14.5"), 15, "Test 3")

    def test_closest_integer_negative(self):
        self.assertEqual(closest_integer("-14.5"), -15, "Test 4")

    def test_closest_integer_zero_point_five(self):
        self.assertEqual(closest_integer("0.5"), 1, "Test 5")

    def test_closest_integer_fifteen_point_seven(self):
        self.assertEqual(closest_integer("15.7"), 16, "Test 6")

    def test_closest_integer_negative_ten_point_two(self):
        self.assertEqual(closest_integer("-10.2"), -10, "Test 7")

    def test_closest_integer_zero(self):
        self.assertEqual(closest_integer("0"), 0, "Test 8")

    def test_closest_integer_empty_string(self):
        self.assertEqual(closest_integer(""), 0, "Test 9")

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that closest_integer('15.3') returns 15
# - test that closest_integer('-14.5') returns -15
# - test that closest_integer('14.5') returns 15

### Function:
def closest_integer(value):
    '''
    Create a function that takes a value (string) representing a number
    and returns the closest integer to it. If the number is equidistant
    from two integers, round it away from zero.

    Examples
    >>> closest_integer("10")
    10
    >>> closest_integer("15.3")
    15

    Note:
    Rounding away from zero means that if the given number is equidistant
    from two integers, the one you should return is the one that is the
    farthest from zero. For example closest_integer("14.5") should
    return 15 and closest_integer("-14.5") should return -15.
    '''
    from math import floor, ceil

    if value.count('.') == 1:
        # remove trailing zeros
        while (value[-1] == '0'):
            value = value[:-1]

    num = float(value)
    if value[-2:] == '.5':
        if num > 0:
            res = ceil(num)
        else:
            res = floor(num)
    elif len(value) > 0:
        res = int(round(num))
    else:
        res = 0

    return res

### Current tests:
import unittest
from target import closest_integer

class TestClosestInteger(unittest.TestCase):
    def test_basic(self):
        assert candidate("10") == 10, "Test 1"

### Improved tests:


import unittest
from target import flip_case

class TestFlipCase(unittest.TestCase):
    def test_empty_string(self):
        self.assertEqual(flip_case(''), '')

    def test_single_word(self):
        self.assertEqual(flip_case('Hello'), 'hELLO')

    def test_mixed_case(self):
        self.assertEqual(flip_case('hello WORLD'), 'HELLO world')

    def test_numbers(self):
        self.assertEqual(flip_case('123'), '123')

    def test_mixed_characters(self):
        self.assertEqual(flip_case('HelloWorld'), 'hELLOwORLD')

    def test_non_alphabet_characters(self):
        self.assertEqual(flip_case('hello123'), 'HELLO123')

    def test_non_english_characters(self):
        self.assertEqual(flip_case('héllo'), 'HÉLLO')

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that flip_case('Hello') returns 'hELLO'
# - test that flip_case('hello WORLD') returns 'HELLO world'
# - test that flip_case('123') returns '123'

### Function:
def flip_case(string: str) -> str:
    """ For a given string, flip lowercase characters to uppercase and uppercase to lowercase.
    >>> flip_case('Hello')
    'hELLO'
    """
    return string.swapcase()

### Current tests:
import unittest
from target import flip_case

class TestFlipCase(unittest.TestCase):
    def test_basic(self):
        assert candidate('') == ''

### Improved tests:


import unittest
from target import max_fill

class TestMaxFill(unittest.TestCase):
    def test_max_fill_example1(self):
        grid = [[0,0,1,0], [0,1,0,0], [1,1,1,1]]
        capacity = 1
        self.assertEqual(max_fill(grid, capacity), 6)

    def test_max_fill_example2(self):
        grid = [[0,0,0], [0,0,0]]
        capacity = 5
        self.assertEqual(max_fill(grid, capacity), 0)

    def test_max_fill_example3(self):
        grid = [[1,1,1], [1,1,1]]
        capacity = 2
        self.assertEqual(max_fill(grid, capacity), 3)

    def test_max_fill_all_ones(self):
        grid = [[1,1,1,1,1], [1,1,1,1,1], [1,1,1,1,1]]
        capacity = 1
        self.assertEqual(max_fill(grid, capacity), 15)

    def test_max_fill_all_zeros(self):
        grid = [[0,0,0,0,0], [0,0,0,0,0], [0,0,0,0,0]]
        capacity = 10
        self.assertEqual(max_fill(grid, capacity), 0)

    def test_max_fill_alternating(self):
        grid = [[1,0,1,0,1], [0,1,0,1,0], [1,0,1,0,1]]
        capacity = 2
        self.assertEqual(max_fill(grid, capacity), 3)

    def test_max_fill_empty_grid(self):
        grid = []
        capacity = 1
        with self.assertRaises(IndexError):
            max_fill(grid, capacity)

    def test_max_fill_zero_capacity(self):
        grid = [[1,1,1], [1,1,1]]
        capacity = 0
        with self.assertRaises(ZeroDivisionError):
            max_fill(grid, capacity)

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that max_fill([[0,0,1,0], [0,1,0,0], [1,1,1,1]], 1) returns 6
# - test that max_fill([[0,0,0], [0,0,0]], 5) returns 0
# - test that max_fill([[1,1,1], [1,1,1]], 2) returns 3

### Function:
def max_fill(grid, capacity):
    import math
    """
    You are given a rectangular grid of wells. Each row represents a single well,
    and each 1 in a row represents a single unit of water.
    Each well has a corresponding bucket that can be used to extract water from it,
    and all buckets have the same capacity.
    Your task is to use the buckets to empty the wells.
    Output the number of times you need to lower the buckets.

    Example 1:
        Input:
            grid : [[0,0,1,0], [0,1,0,0], [1,1,1,1]]
            bucket_capacity : 1
        Output: 6

    Example 2:
        Input:
            grid : [[0,0,1,1], [0,0,0,0], [1,1,1,1], [0,1,1,1]]
            bucket_capacity : 2
        Output: 5

    Example 3:
        Input:
            grid : [[0,0,0], [0,0,0]]
            bucket_capacity : 5
        Output: 0

    Constraints:
        * all wells have the same length
        * 1 <= grid.length <= 10^2
        * 1 <= grid[:,1].length <= 10^2
        * grid[i][j] -> 0 | 1
        * 1 <= capacity <= 10
    """
    return sum([math.ceil(sum(arr)/capacity) for arr in grid])

### Current tests:
import unittest
from target import max_fill

class TestMaxFill(unittest.TestCase):
    def test_basic(self):
        assert True, "This prints if this assert fails 1 (good for debugging!)"

### Improved tests:


import unittest
from target import pluck

class TestPluck(unittest.TestCase):
    def test_basic(self):
        self.assertEqual(pluck([4, 2, 3]), [2, 1])

    def test_single_even(self):
        self.assertEqual(pluck([1, 2, 3]), [2, 1])

    def test_empty_array(self):
        self.assertEqual(pluck([]), [])

    def test_multiple_smallest_evens(self):
        self.assertEqual(pluck([5, 0, 3, 0, 4, 2]), [0, 1])

    def test_all_evens(self):
        self.assertEqual(pluck([10, 20, 30, 40, 50]), [10, 0])

    def test_no_evens(self):
        self.assertEqual(pluck([1, 3, 5, 7, 9]), [])

    def test_smallest_even_at_end(self):
        self.assertEqual(pluck([1, 3, 5, 7, 10]), [10, 4])

    def test_smallest_even_at_start(self):
        self.assertEqual(pluck([2, 3, 5, 7, 9]), [2, 0])

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that pluck([4, 2, 3]) returns [2, 1]
# - test that pluck([1, 2, 3]) returns [2, 1]
# - test that pluck([]) returns []

### Function:
def pluck(arr):
    """
    "Given an array representing a branch of a tree that has non-negative integer nodes
    your task is to pluck one of the nodes and return it.
    The plucked node should be the node with the smallest even value.
    If multiple nodes with the same smallest even value are found return the node that has smallest index.

    The plucked node should be returned in a list, [ smalest_value, its index ],
    If there are no even values or the given array is empty, return [].

    Example 1:
        Input: [4,2,3]
        Output: [2, 1]
        Explanation: 2 has the smallest even value, and 2 has the smallest index.

    Example 2:
        Input: [1,2,3]
        Output: [2, 1]
        Explanation: 2 has the smallest even value, and 2 has the smallest index.

    Example 3:
        Input: []
        Output: []

    Example 4:
        Input: [5, 0, 3, 0, 4, 2]
        Output: [0, 1]
        Explanation: 0 is the smallest value, but  there are two zeros,
                     so we will choose the first zero, which has the smallest index.

    Constraints:
        * 1 <= nodes.length <= 10000
        * 0 <= node.value
    """
    if(len(arr) == 0): return []
    evens = list(filter(lambda x: x%2 == 0, arr))
    if(evens == []): return []
    return [min(evens), arr.index(min(evens))]

### Current tests:
import unittest
from target import pluck

class TestPluck(unittest.TestCase):
    def test_basic(self):
        assert True, "This prints if this assert fails 1 (good for debugging!)"

### Improved tests:


import unittest
from target import count_nums

class TestCountNums(unittest.TestCase):
    def test_basic(self):
        self.assertEqual(count_nums([]), 0)

    def test_count_nums_positive(self):
        self.assertEqual(count_nums([1, 2, 3]), 3)

    def test_count_nums_mixed(self):
        self.assertEqual(count_nums([-1, 0, 1]), 1)

    def test_count_nums_large(self):
        self.assertEqual(count_nums([10, 20, 30]), 3)

    def test_count_nums_large_numbers(self):
        self.assertEqual(count_nums([100, -100, 0]), 1)

    def test_count_nums_negative(self):
        self.assertEqual(count_nums([-5, -10, -15]), 0)

    def test_count_nums_large_numbers_2(self):
        self.assertEqual(count_nums([1000, 2000, 3000]), 3)

    def test_count_nums_negative_numbers(self):
        self.assertEqual(count_nums([-123, -456, -789]), 0)

    def test_count_nums_zero(self):
        self.assertEqual(count_nums([0, 0, 0]), 0)

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that count_nums([1, 2, 3]) returns 3
# - test that count_nums([-1, 0, 1]) returns 1
# - test that count_nums([10, 20, 30]) returns 3

### Function:
def count_nums(arr):
    """
    Write a function count_nums which takes an array of integers and returns
    the number of elements which has a sum of digits > 0.
    If a number is negative, then its first signed digit will be negative:
    e.g. -123 has signed digits -1, 2, and 3.
    >>> count_nums([]) == 0
    >>> count_nums([-1, 11, -11]) == 1
    >>> count_nums([1, 1, 2]) == 3
    """
    def digits_sum(n):
        neg = 1
        if n < 0: n, neg = -1 * n, -1
        n = [int(i) for i in str(n)]
        n[0] = n[0] * neg
        return sum(n)
    return len(list(filter(lambda x: x > 0, [digits_sum(i) for i in arr])))

### Current tests:
import unittest
from target import count_nums

class TestCountNums(unittest.TestCase):
    def test_basic(self):
        assert candidate([]) == 0

### Improved tests:


import unittest
from target import decimal_to_binary

class TestDecimalToBinary(unittest.TestCase):
    def test_basic(self):
        self.assertEqual(decimal_to_binary(0), "db0db")

    def test_decimal_to_binary_15(self):
        self.assertEqual(decimal_to_binary(15), "db1111db")

    def test_decimal_to_binary_32(self):
        self.assertEqual(decimal_to_binary(32), "db100000db")

    def test_decimal_to_binary_1024(self):
        self.assertEqual(decimal_to_binary(1024), "db10000000000db")

    def test_decimal_to_binary_negative(self):
        with self.assertRaises(ValueError):
            decimal_to_binary(-1)

    def test_decimal_to_binary_negative_10(self):
        with self.assertRaises(ValueError):
            decimal_to_binary(-10)

    def test_decimal_to_binary_zero(self):
        self.assertEqual(decimal_to_binary(0), "db0db")

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that decimal_to_binary(15) returns 'db1111db'
# - test that decimal_to_binary(32) returns 'db100000db'
# - test that decimal_to_binary(-1) raises ValueError when decimal is negative

### Function:
def decimal_to_binary(decimal):
    """You will be given a number in decimal form and your task is to convert it to
    binary format. The function should return a string, with each character representing a binary
    number. Each character in the string will be '0' or '1'.

    There will be an extra couple of characters 'db' at the beginning and at the end of the string.
    The extra characters are there to help with the format.

    Examples:
    decimal_to_binary(15)   # returns "db1111db"
    decimal_to_binary(32)   # returns "db100000db"
    """
    return "db" + bin(decimal)[2:] + "db"

### Current tests:
import unittest
from target import decimal_to_binary

class TestDecimalToBinary(unittest.TestCase):
    def test_basic(self):
        assert candidate(0) == "db0db"

### Improved tests:


import unittest
from target import numerical_letter_grade

class TestNumericalLetterGrade(unittest.TestCase):
    def test_basic(self):
        self.assertEqual(numerical_letter_grade([4.0, 3, 1.7, 2, 3.5]), ['A+', 'B', 'C-', 'C', 'A-'])

    def test_numerical_letter_grade_range(self):
        self.assertEqual(numerical_letter_grade([4.0, 3.7, 3.3, 3.0, 2.7, 2.3, 2.0, 1.7, 1.3, 1.0, 0.7, 0.0]),
                         ['A+', 'A', 'A-', 'B+', 'B', 'B-', 'C+', 'C', 'C-', 'D+', 'D', 'D-'])

    def test_numerical_letter_grade_zero(self):
        self.assertEqual(numerical_letter_grade([0.0]), ['E'])

    def test_numerical_letter_grade_empty(self):
        self.assertEqual(numerical_letter_grade([]), [])

    def test_numerical_letter_grade_single(self):
        self.assertEqual(numerical_letter_grade([3.8]), ['A'])

    def test_numerical_letter_grade_single_b(self):
        self.assertEqual(numerical_letter_grade([2.8]), ['B'])

    def test_numerical_letter_grade_negative(self):
        self.assertEqual(numerical_letter_grade([-1.0]), ['E'])

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that numerical_letter_grade([4.0, 3.7, 3.3, 3.0, 2.7, 2.3, 2.0, 1.7, 1.3, 1.0, 0.7, 0.0]) returns ['A+', 'A', 'A-', 'B+', 'B', 'B-', 'C+', 'C', 'C-', 'D+', 'D', 'D-']
# - test that numerical_letter_grade([0.0]) returns ['E']
# - test that numerical_letter_grade([]) returns []

### Function:
def numerical_letter_grade(grades):
    """It is the last week of the semester and the teacher has to give the grades
    to students. The teacher has been making her own algorithm for grading.
    The only problem is, she has lost the code she used for grading.
    She has given you a list of GPAs for some students and you have to write
    a function that can output a list of letter grades using the following table:
             GPA       |    Letter grade
              4.0                A+
            > 3.7                A
            > 3.3                A-
            > 3.0                B+
            > 2.7                B
            > 2.3                B-
            > 2.0                C+
            > 1.7                C
            > 1.3                C-
            > 1.0                D+
            > 0.7                D
            > 0.0                D-
              0.0                E

    Example:
    grade_equation([4.0, 3, 1.7, 2, 3.5]) ==> ['A+', 'B', 'C-', 'C', 'A-']
    """

    letter_grade = []
    for gpa in grades:
        if gpa == 4.0:
            letter_grade.append("A+")
        elif gpa > 3.7:
            letter_grade.append("A")
        elif gpa > 3.3:
            letter_grade.append("A-")
        elif gpa > 3.0:
            letter_grade.append("B+")
        elif gpa > 2.7:
            letter_grade.append("B")
        elif gpa > 2.3:
            letter_grade.append("B-")
        elif gpa > 2.0:
            letter_grade.append("C+")
        elif gpa > 1.7:
            letter_grade.append("C")
        elif gpa > 1.3:
            letter_grade.append("C-")
        elif gpa > 1.0:
            letter_grade.append("D+")
        elif gpa > 0.7:
            letter_grade.append("D")
        elif gpa > 0.0:
            letter_grade.append("D-")
        else:
            letter_grade.append("E")
    return letter_grade

### Current tests:
import unittest
from target import numerical_letter_grade

class TestNumericalLetterGrade(unittest.TestCase):
    def test_basic(self):
        assert candidate([4.0, 3, 1.7, 2, 3.5]) == ['A+', 'B', 'C-', 'C', 'A-']

### Improved tests:


import unittest
from target import can_arrange

class TestCanArrange(unittest.TestCase):
    def test_basic(self):
        self.assertEqual(can_arrange([1,2,4,3,5]), 3)

    def test_increasing_sequence(self):
        self.assertEqual(can_arrange([1, 2, 3]), -1)

    def test_decreasing_sequence(self):
        self.assertEqual(can_arrange([5, 4, 3, 2, 1]), 1)

    def test_empty_array(self):
        self.assertEqual(can_arrange([]), -1)

    def test_single_element_array(self):
        self.assertEqual(can_arrange([1]), -1)

    def test_invalid_input(self):
        with self.assertRaises(TypeError):
            can_arrange(None)

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that can_arrange([1, 2, 3]) returns -1
# - test that can_arrange([5, 4, 3, 2, 1]) returns 1
# - test that can_arrange([]) returns -1

### Function:
def can_arrange(arr):
    """Create a function which returns the largest index of an element which
    is not greater than or equal to the element immediately preceding it. If
    no such element exists then return -1. The given array will not contain
    duplicate values.

    Examples:
    can_arrange([1,2,4,3,5]) = 3
    can_arrange([1,2,3]) = -1
    """
    ind=-1
    i=1
    while i<len(arr):
      if arr[i]<arr[i-1]:
        ind=i
      i+=1
    return ind

### Current tests:
import unittest
from target import can_arrange

class TestCanArrange(unittest.TestCase):
    def test_basic(self):
        assert candidate([1,2,4,3,5])==3

### Improved tests:


import unittest
from target import cycpattern_check

class TestCycpatternCheck(unittest.TestCase):
    def test_basic(self):
        self.assertFalse(cycpattern_check("abcd","abd"))

    def test_hello_ell(self):
        self.assertTrue(cycpattern_check('hello', 'ell'))

    def test_abcd_abd(self):
        self.assertFalse(cycpattern_check('abcd', 'abd'))

    def test_empty_string(self):
        self.assertFalse(cycpattern_check('', 'abc'))

    def test_abcabc_abc(self):
        self.assertTrue(cycpattern_check('abcabc', 'abc'))

    def test_abcdef_def(self):
        self.assertTrue(cycpattern_check('abcdef', 'def'))

    def test_aaaaaa_aa(self):
        self.assertTrue(cycpattern_check('aaaaaa', 'aa'))

    def test_abab_baa(self):
        self.assertTrue(cycpattern_check('abab', 'baa'))

    def test_efef_eeff(self):
        self.assertFalse(cycpattern_check('efef', 'eeff'))

    def test_himenss_simen(self):
        self.assertTrue(cycpattern_check('himenss', 'simen'))

    def test_whassup_psus(self):
        self.assertFalse(cycpattern_check('whassup', 'psus'))

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that cycpattern_check('hello', 'ell') returns True
# - test that cycpattern_check('abcd', 'abd') returns False
# - test that cycpattern_check('', 'abc') returns False

### Function:
def cycpattern_check(a , b):
    """You are given 2 words. You need to return True if the second word or any of its rotations is a substring in the first word
    cycpattern_check("abcd","abd") => False
    cycpattern_check("hello","ell") => True
    cycpattern_check("whassup","psus") => False
    cycpattern_check("abab","baa") => True
    cycpattern_check("efef","eeff") => False
    cycpattern_check("himenss","simen") => True

    """
    l = len(b)
    pat = b + b
    for i in range(len(a) - l + 1):
        for j in range(l + 1):
            if a[i:i+l] == pat[j:j+l]:
                return True
    return False

### Current tests:
import unittest
from target import cycpattern_check

class TestCycpatternCheck(unittest.TestCase):
    def test_basic(self):
        assert  candidate("xyzw","xyw") == False , "test #0"

### Improved tests:


import unittest
from target import greatest_common_divisor

class TestGreatestCommonDivisor(unittest.TestCase):
    def test_basic(self):
        self.assertEqual(greatest_common_divisor(3, 7), 1)

    def test_zero_and_non_zero(self):
        self.assertEqual(greatest_common_divisor(0, 5), 5)

    def test_identical_inputs(self):
        self.assertEqual(greatest_common_divisor(25, 25), 25)

    def test_negative_and_positive(self):
        self.assertEqual(greatest_common_divisor(-3, 5), 1)

    def test_zero_and_zero(self):
        self.assertEqual(greatest_common_divisor(0, 0), 0)

    def test_two_negative_numbers(self):
        self.assertEqual(greatest_common_divisor(-10, -20), 10)

    def test_non_integer_inputs(self):
        with self.assertRaises(TypeError):
            greatest_common_divisor(1.5, 3.5)

    def test_non_numeric_inputs(self):
        with self.assertRaises(TypeError):
            greatest_common_divisor('a', 3)

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that greatest_common_divisor(0, 5) returns 5
# - test that greatest_common_divisor(25, 25) returns 25
# - test that greatest_common_divisor(-3, 5) returns 1

### Function:
def greatest_common_divisor(a: int, b: int) -> int:
    """ Return a greatest common divisor of two integers a and b
    >>> greatest_common_divisor(3, 5)
    1
    >>> greatest_common_divisor(25, 15)
    5
    """
    while b:
        a, b = b, a % b
    return a

### Current tests:
import unittest
from target import greatest_common_divisor

class TestGreatestCommonDivisor(unittest.TestCase):
    def test_basic(self):
        assert candidate(3, 7) == 1

### Improved tests:


import unittest
from target import minPath

class TestMinpath(unittest.TestCase):
    def test_basic(self):
        self.assertEqual(minPath([[1, 2, 3], [4, 5, 6], [7, 8, 9]], 3), [1, 2, 1])

    def test_single_cell(self):
        self.assertEqual(minPath([[5, 9, 3], [4, 1, 6], [7, 8, 2]], 1), [1])

    def test_k_larger_than_cells(self):
        with self.assertRaises(ValueError):
            minPath([[1]], 2)

    def test_k_equal_to_cells(self):
        self.assertEqual(minPath([[1]], 1), [1])

    def test_2x2_grid(self):
        self.assertEqual(minPath([[1, 2], [3, 4]], 4), [1, 2, 1, 2])

    def test_4x3_grid(self):
        self.assertEqual(minPath([[5, 9, 3, 1], [4, 1, 6, 8], [7, 8, 2, 6]], 2), [1, 1])

    def test_3x3_grid_with_same_values(self):
        self.assertEqual(minPath([[1, 1, 1], [1, 1, 1], [1, 1, 1]], 3), [1, 1, 1])

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that minPath([[5,9,3], [4,1,6], [7,8,2]], 1) returns [1]
# - test that minPath([[1,2,3], [4,5,6], [7,8,9]], 3) returns [1, 2, 1]
# - test that minPath([[1]], 2) raises ValueError when k is larger than the number of cells in the grid

### Function:
def minPath(grid, k):
    """
    Given a grid with N rows and N columns (N >= 2) and a positive integer k,
    each cell of the grid contains a value. Every integer in the range [1, N * N]
    inclusive appears exactly once on the cells of the grid.

    You have to find the minimum path of length k in the grid. You can start
    from any cell, and in each step you can move to any of the neighbor cells,
    in other words, you can go to cells which share an edge with you current
    cell.
    Please note that a path of length k means visiting exactly k cells (not
    necessarily distinct).
    You CANNOT go off the grid.
    A path A (of length k) is considered less than a path B (of length k) if
    after making the ordered lists of the values on the cells that A and B go
    through (let's call them lst_A and lst_B), lst_A is lexicographically less
    than lst_B, in other words, there exist an integer index i (1 <= i <= k)
    such that lst_A[i] < lst_B[i] and for any j (1 <= j < i) we have
    lst_A[j] = lst_B[j].
    It is guaranteed that the answer is unique.
    Return an ordered list of the values on the cells that the minimum path go through.

    Examples:

        Input: grid = [ [1,2,3], [4,5,6], [7,8,9]], k = 3
        Output: [1, 2, 1]

        Input: grid = [ [5,9,3], [4,1,6], [7,8,2]], k = 1
        Output: [1]
    """
    n = len(grid)
    val = n * n + 1
    for i in range(n):
        for j in range(n):
            if grid[i][j] == 1:
                temp = []
                if i != 0:
                    temp.append(grid[i - 1][j])

                if j != 0:
                    temp.append(grid[i][j - 1])

                if i != n - 1:
                    temp.append(grid[i + 1][j])

                if j != n - 1:
                    temp.append(grid[i][j + 1])

                val = min(temp)

    ans = []
    for i in range(k):
        if i % 2 == 0:
            ans.append(1)
        else:
            ans.append(val)
    return ans

### Current tests:
import unittest
from target import minPath

class TestMinpath(unittest.TestCase):
    def test_basic(self):
        assert candidate([[1, 2, 3], [4, 5, 6], [7, 8, 9]], 3) == [1, 2, 1]

### Improved tests:


import unittest
from target import count_upper

class TestCountUpper(unittest.TestCase):
    def test_basic(self):
        self.assertEqual(count_upper('aBCdEf'), 1)

    def test_no_uppercase(self):
        self.assertEqual(count_upper('abcdefg'), 0)

    def test_empty_string(self):
        self.assertEqual(count_upper(''), 0)

    def test_uppercase_vowels(self):
        self.assertEqual(count_upper('AEIOU'), 3)

    def test_non_string_input(self):
        with self.assertRaises(TypeError):
            count_upper(123)

    def test_non_english_characters(self):
        self.assertEqual(count_upper('äëïöü'), 0)

    def test_mixed_case(self):
        self.assertEqual(count_upper('aEiOu'), 2)

    def test_single_character(self):
        self.assertEqual(count_upper('A'), 1)

    def test_single_character_lowercase(self):
        self.assertEqual(count_upper('a'), 0)

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that count_upper('abcdefg') returns 0
# - test that count_upper('') returns 0
# - test that count_upper('AEIOU') returns 3

### Function:
def count_upper(s):
    """
    Given a string s, count the number of uppercase vowels in even indices.

    For example:
    count_upper('aBCdEf') returns 1
    count_upper('abcdefg') returns 0
    count_upper('dBBE') returns 0
    """
    count = 0
    for i in range(0,len(s),2):
        if s[i] in "AEIOU":
            count += 1
    return count

### Current tests:
import unittest
from target import count_upper

class TestCountUpper(unittest.TestCase):
    def test_basic(self):
        assert candidate('aBCdEf')  == 1

### Improved tests:


import unittest
from target import intersperse

class TestIntersperse(unittest.TestCase):
    def test_empty_list(self):
        self.assertEqual(intersperse([], 7), [])

    def test_single_element_list(self):
        self.assertEqual(intersperse([1], 4), [1])

    def test_multiple_element_list(self):
        self.assertEqual(intersperse([1, 2, 3], 4), [1, 4, 2, 4, 3])

    def test_large_numbers(self):
        self.assertEqual(intersperse([10, 20, 30, 40, 50], 4), [10, 4, 20, 4, 30, 4, 40, 4, 50])

    def test_negative_numbers(self):
        self.assertEqual(intersperse([-1, -2, -3, -4, -5], 4), [-1, 4, -2, 4, -3, 4, -4, 4, -5])

    def test_zero_delimeter(self):
        self.assertEqual(intersperse([1, 2, 3], 0), [1, 0, 2, 0, 3])

    def test_large_delimeter(self):
        self.assertEqual(intersperse([1, 2, 3], 100), [1, 100, 2, 100, 3])

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that intersperse([1, 2, 3], 4) returns [1, 4, 2, 4, 3]
# - test that intersperse([1], 4) returns [1]
# - test that intersperse([1, 2, 3], 0) returns [1, 0, 2, 0, 3]

### Function:
from typing import List

def intersperse(numbers: List[int], delimeter: int) -> List[int]:
    """ Insert a number 'delimeter' between every two consecutive elements of input list `numbers'
    >>> intersperse([], 4)
    []
    >>> intersperse([1, 2, 3], 4)
    [1, 4, 2, 4, 3]
    """
    if not numbers:
        return []

    result = []

    for n in numbers[:-1]:
        result.append(n)
        result.append(delimeter)

    result.append(numbers[-1])

    return result

### Current tests:
import unittest
from target import intersperse

class TestIntersperse(unittest.TestCase):
    def test_basic(self):
        assert candidate([], 7) == []

### Improved tests:


import unittest
from target import is_palindrome

class TestIsPalindrome(unittest.TestCase):
    def test_empty_string(self):
        self.assertTrue(is_palindrome(''))

    def test_single_character(self):
        self.assertTrue(is_palindrome('a'))

    def test_palindrome(self):
        self.assertTrue(is_palindrome('aba'))

    def test_not_palindrome(self):
        self.assertFalse(is_palindrome('zbcd'))

    def test_non_alphanumeric(self):
        self.assertTrue(is_palindrome('!@#'))

    def test_long_string(self):
        self.assertTrue(is_palindrome('a' * 1000))

    def test_non_string_input(self):
        with self.assertRaises(TypeError):
            is_palindrome(123)

    def test_non_string_input_list(self):
        with self.assertRaises(TypeError):
            is_palindrome([1, 2, 3])

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that is_palindrome('aba') returns True
# - test that is_palindrome('zbcd') returns False
# - test that is_palindrome(123) raises TypeError when input is not a string

### Function:
def is_palindrome(text: str):
    """
    Checks if given string is a palindrome
    >>> is_palindrome('')
    True
    >>> is_palindrome('aba')
    True
    >>> is_palindrome('aaaaa')
    True
    >>> is_palindrome('zbcd')
    False
    """
    for i in range(len(text)):
        if text[i] != text[len(text) - 1 - i]:
            return False
    return True

### Current tests:
import unittest
from target import is_palindrome

class TestIsPalindrome(unittest.TestCase):
    def test_basic(self):
        assert candidate('') == True

### Improved tests:


import unittest
from target import words_in_sentence

class TestWordsInSentence(unittest.TestCase):
    def test_basic(self):
        self.assertEqual(words_in_sentence("This is a test"), "is")

    def test_single_prime_word(self):
        self.assertEqual(words_in_sentence("lets"), "lets")

    def test_multiple_prime_words(self):
        self.assertEqual(words_in_sentence("lets go for swimming"), "go for")

    def test_all_prime_words(self):
        self.assertEqual(words_in_sentence("a b c"), "a b c")

    def test_empty_string(self):
        self.assertEqual(words_in_sentence(""), "")

    def test_single_word(self):
        self.assertEqual(words_in_sentence("test"), "")

    def test_no_prime_words(self):
        self.assertEqual(words_in_sentence("hello world"), "")

    def test_single_prime_length_word(self):
        self.assertEqual(words_in_sentence("no"), "no")

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that words_in_sentence('lets go for swimming') returns 'go for'
# - test that words_in_sentence('a b c') returns 'a b c'
# - test that words_in_sentence('') returns ''

### Function:
def words_in_sentence(sentence):
    """
    You are given a string representing a sentence,
    the sentence contains some words separated by a space,
    and you have to return a string that contains the words from the original sentence,
    whose lengths are prime numbers,
    the order of the words in the new string should be the same as the original one.

    Example 1:
        Input: sentence = "This is a test"
        Output: "is"

    Example 2:
        Input: sentence = "lets go for swimming"
        Output: "go for"

    Constraints:
        * 1 <= len(sentence) <= 100
        * sentence contains only letters
    """
    new_lst = []
    for word in sentence.split():
        flg = 0
        if len(word) == 1:
            flg = 1
        for i in range(2, len(word)):
            if len(word)%i == 0:
                flg = 1
        if flg == 0 or len(word) == 2:
            new_lst.append(word)
    return " ".join(new_lst)

### Current tests:
import unittest
from target import words_in_sentence

class TestWordsInSentence(unittest.TestCase):
    def test_basic(self):
        assert candidate("This is a test") == "is"

### Improved tests:


import unittest
from target import encrypt

class TestEncrypt(unittest.TestCase):
    def test_basic(self):
        self.assertEqual(encrypt('hi'), 'lm')

    def test_long_string(self):
        self.assertEqual(encrypt('abcdefg'), 'cdefghi')

    def test_hello_world(self):
        self.assertEqual(encrypt('hello world'), 'jgnnq btwqi')

    def test_numbers(self):
        self.assertEqual(encrypt('12345'), '12345')

    def test_empty_string(self):
        self.assertEqual(encrypt(''), '')

    def test_uppercase(self):
        self.assertEqual(encrypt('HELLO'), 'JGNNO')

    def test_special_characters(self):
        self.assertEqual(encrypt('hello!@#'), 'jgnnq!@#')

    def test_mixed_case(self):
        self.assertEqual(encrypt('HeLlO'), 'JgNnO')

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that encrypt('abcdefg') returns 'cdefghi'
# - test that encrypt('hello world') returns 'jgnnq btwqi'
# - test that encrypt('12345') returns '12345'

### Function:
def encrypt(s):
    """Create a function encrypt that takes a string as an argument and
    returns a string encrypted with the alphabet being rotated.
    The alphabet should be rotated in a manner such that the letters
    shift down by two multiplied to two places.
    For example:
    encrypt('hi') returns 'lm'
    encrypt('asdfghjkl') returns 'ewhjklnop'
    encrypt('gf') returns 'kj'
    encrypt('et') returns 'ix'
    """
    d = 'abcdefghijklmnopqrstuvwxyz'
    out = ''
    for c in s:
        if c in d:
            out += d[(d.index(c)+2*2) % 26]
        else:
            out += c
    return out

### Current tests:
import unittest
from target import encrypt

class TestEncrypt(unittest.TestCase):
    def test_basic(self):
        assert candidate('hi') == 'lm', "This prints if this assert fails 1 (good for debugging!)"

### Improved tests:


import unittest
from target import maximum

class TestMaximum(unittest.TestCase):
    def test_basic(self):
        self.assertEqual(maximum([-3, -4, 5], 3), [-4, -3, 5])

    def test_k_zero(self):
        self.assertEqual(maximum([1, 2, 3], 0), [])

    def test_k_larger_than_array_length(self):
        self.assertEqual(maximum([1, 2, 3], 5), [1, 2, 3])

    def test_negative_numbers(self):
        self.assertEqual(maximum([-1, -2, -3], 2), [-1, -2])

    def test_duplicate_elements(self):
        self.assertEqual(maximum([1, 1, 1], 2), [1, 1])

    def test_empty_array(self):
        with self.assertRaises(IndexError):
            maximum([], 1)

    def test_k_equal_to_array_length(self):
        self.assertEqual(maximum([1, 2, 3], 3), [1, 2, 3])

    def test_large_array(self):
        self.assertEqual(maximum([1, 2, 3, 4, 5], 0), [])

    def test_large_negative_numbers(self):
        self.assertEqual(maximum([-1000, -999, -998], 3), [-1000, -999, -998])

    def test_zeros(self):
        self.assertEqual(maximum([0, 0, 0, 0, 0], 5), [0, 0, 0, 0, 0])

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that maximum([1, 2, 3], 0) returns []
# - test that maximum([-1, -2, -3], 2) returns [-1, -2]
# - test that maximum([1, 1, 1], 2) returns [1, 1]

### Function:
def maximum(arr, k):
    """
    Given an array arr of integers and a positive integer k, return a sorted list
    of length k with the maximum k numbers in arr.

    Example 1:

        Input: arr = [-3, -4, 5], k = 3
        Output: [-4, -3, 5]

    Example 2:

        Input: arr = [4, -4, 4], k = 2
        Output: [4, 4]

    Example 3:

        Input: arr = [-3, 2, 1, 2, -1, -2, 1], k = 1
        Output: [2]

    Note:
        1. The length of the array will be in the range of [1, 1000].
        2. The elements in the array will be in the range of [-1000, 1000].
        3. 0 <= k <= len(arr)
    """
    if k == 0:
        return []
    arr.sort()
    ans = arr[-k:]
    return ans

### Current tests:
import unittest
from target import maximum

class TestMaximum(unittest.TestCase):
    def test_basic(self):
        assert candidate([-3, -4, 5], 3) == [-4, -3, 5]

### Improved tests:


import unittest
from target import string_to_md5

class TestStringToMd5(unittest.TestCase):
    def test_empty_string(self):
        self.assertIsNone(string_to_md5(''))

    def test_hello_world(self):
        self.assertEqual(string_to_md5('Hello world'), '3e25960a79dbc69b674cd4ec67a72c62')

    def test_non_ascii_characters(self):
        self.assertEqual(string_to_md5('non-ASCII characters: éàü'), 'b10a8db164e0754105b7a99be72e3fe5')

    def test_non_string_input(self):
        with self.assertRaises(TypeError):
            string_to_md5(123)

    def test_non_string_input_list(self):
        with self.assertRaises(TypeError):
            string_to_md5([1, 2, 3])

    def test_non_string_input_dict(self):
        with self.assertRaises(TypeError):
            string_to_md5({'a': 1})

    def test_non_string_input_set(self):
        with self.assertRaises(TypeError):
            string_to_md5({1, 2, 3})

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that string_to_md5('') returns None
# - test that string_to_md5('Hello world') returns '3e25960a79dbc69b674cd4ec67a72c62'
# - test that string_to_md5('non-ASCII characters: éàü') returns 'b10a8db164e0754105b7a99be72e3fe5'

### Function:
def string_to_md5(text):
    """
    Given a string 'text', return its md5 hash equivalent string.
    If 'text' is an empty string, return None.

    >>> string_to_md5('Hello world') == '3e25960a79dbc69b674cd4ec67a72c62'
    """
    import hashlib
    return hashlib.md5(text.encode('ascii')).hexdigest() if text else None

### Current tests:
import unittest
from target import string_to_md5

class TestStringToMd5(unittest.TestCase):
    def test_basic(self):
        assert candidate('Hello world') == '3e25960a79dbc69b674cd4ec67a72c62'

### Improved tests:


import unittest
from target import sorted_list_sum

class TestSortedListSum(unittest.TestCase):
    def test_basic(self):
        self.assertEqual(sorted_list_sum(["aa", "a", "aaa"]), ["aa"])

    def test_empty_list(self):
        self.assertEqual(sorted_list_sum([]), [])

    def test_all_even(self):
        self.assertEqual(sorted_list_sum(['aa', 'bb', 'cc']), ['aa', 'bb', 'cc'])

    def test_all_odd(self):
        self.assertEqual(sorted_list_sum(['a', 'bb', 'ccc']), ['bb'])

    def test_various_lengths(self):
        self.assertEqual(sorted_list_sum(['a', 'b', 'c', 'd', 'e']), [])

    def test_duplicates(self):
        self.assertEqual(sorted_list_sum(['aa', 'bb', 'cc', 'dd', 'ee', 'ff']), ['aa', 'bb', 'cc', 'dd', 'ee', 'ff'])

    def test_long_strings(self):
        self.assertEqual(sorted_list_sum(['abcdef', 'ab', 'abc', 'abcd', 'abcde']), ['ab', 'abc', 'abcd', 'abcde'])

    def test_single_element(self):
        self.assertEqual(sorted_list_sum(['aa']), ['aa'])

    def test_single_odd_element(self):
        self.assertEqual(sorted_list_sum(['a']), [])

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that sorted_list_sum(['aa', 'bb', 'cc']) returns ['aa', 'bb', 'cc']
# - test that sorted_list_sum(['a', 'bb', 'ccc']) returns ['bb']
# - test that sorted_list_sum([]) returns []

### Function:
def sorted_list_sum(lst):
    """Write a function that accepts a list of strings as a parameter,
    deletes the strings that have odd lengths from it,
    and returns the resulted list with a sorted order,
    The list is always a list of strings and never an array of numbers,
    and it may contain duplicates.
    The order of the list should be ascending by length of each word, and you
    should return the list sorted by that rule.
    If two words have the same length, sort the list alphabetically.
    The function should return a list of strings in sorted order.
    You may assume that all words will have the same length.
    For example:
    assert list_sort(["aa", "a", "aaa"]) => ["aa"]
    assert list_sort(["ab", "a", "aaa", "cd"]) => ["ab", "cd"]
    """
    lst.sort()
    new_lst = []
    for i in lst:
        if len(i)%2 == 0:
            new_lst.append(i)
    return sorted(new_lst, key=len)

### Current tests:
import unittest
from target import sorted_list_sum

class TestSortedListSum(unittest.TestCase):
    def test_basic(self):
        assert candidate(["aa", "a", "aaa"]) == ["aa"]

### Improved tests:


import unittest
from target import minSubArraySum

class TestMinsubarraysum(unittest.TestCase):
    def test_basic(self):
        self.assertEqual(minSubArraySum([2, 3, 4, 1, 2, 4]), 1)

    def test_single_element(self):
        self.assertEqual(minSubArraySum([1, 2, 3, 4, 5]), 1)

    def test_all_negative(self):
        self.assertEqual(minSubArraySum([-1, -2, -3, -4, -5]), -1)

    def test_empty_array(self):
        with self.assertRaises(ValueError):
            minSubArraySum([])

    def test_alternating_positive_negative(self):
        self.assertEqual(minSubArraySum([1, -1, 1, -1]), -1)

    def test_large_alternating_numbers(self):
        self.assertEqual(minSubArraySum([-10, 10, -10, 10]), -10)

    def test_all_zeros(self):
        self.assertEqual(minSubArraySum([0, 0, 0, 0, 0]), 0)

    def test_negative_numbers(self):
        self.assertEqual(minSubArraySum([-1, -2, -3]), -6)

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that minSubArraySum([1, 2, 3, 4, 5]) returns 1
# - test that minSubArraySum([-1, -2, -3, -4, -5]) returns -15
# - test that minSubArraySum([]) raises ValueError when input is empty

### Function:
def minSubArraySum(nums):
    """
    Given an array of integers nums, find the minimum sum of any non-empty sub-array
    of nums.
    Example
    minSubArraySum([2, 3, 4, 1, 2, 4]) == 1
    minSubArraySum([-1, -2, -3]) == -6
    """
    max_sum = 0
    s = 0
    for num in nums:
        s += -num
        if (s < 0):
            s = 0
        max_sum = max(s, max_sum)
    if max_sum == 0:
        max_sum = max(-i for i in nums)
    min_sum = -max_sum
    return min_sum

### Current tests:
import unittest
from target import minSubArraySum

class TestMinsubarraysum(unittest.TestCase):
    def test_basic(self):
        assert candidate([2, 3, 4, 1, 2, 4]) == 1, "This prints if this assert fails 1 (good for debugging!)"

### Improved tests:


import unittest
from target import triangle_area

class TestTriangleArea(unittest.TestCase):
    def test_basic(self):
        self.assertEqual(triangle_area(5, 3), 7.5)

    def test_zero_base(self):
        self.assertEqual(triangle_area(0, 5), 0)

    def test_zero_height(self):
        self.assertEqual(triangle_area(5, 0), 0)

    def test_negative_base(self):
        with self.assertRaises(ValueError):
            triangle_area(-5, 3)

    def test_negative_height(self):
        with self.assertRaises(ValueError):
            triangle_area(5, -3)

    def test_zero_base_and_height(self):
        self.assertEqual(triangle_area(0, 0), 0)

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that triangle_area(0, 5) returns 0
# - test that triangle_area(5, 0) returns 0
# - test that triangle_area(-5, 3) raises ValueError when input values are negative

### Function:
def triangle_area(a, h):
    """Given length of a side and high return area for a triangle.
    >>> triangle_area(5, 3)
    7.5
    """
    return a * h / 2.0

### Current tests:
import unittest
from target import triangle_area

class TestTriangleArea(unittest.TestCase):
    def test_basic(self):
        assert candidate(5, 3) == 7.5

### Improved tests:


import unittest
from target import next_smallest

class TestNextSmallest(unittest.TestCase):
    def test_basic(self):
        self.assertEqual(next_smallest([1, 2, 3, 4, 5]), 2)

    def test_empty_list(self):
        self.assertIsNone(next_smallest([]))

    def test_list_with_duplicates(self):
        self.assertIsNone(next_smallest([5, 5, 5]))

    def test_list_with_negative_numbers(self):
        self.assertEqual(next_smallest([-1, -2, -3, -4, -5]), -2)

    def test_list_with_duplicate_and_unique_elements(self):
        self.assertEqual(next_smallest([10, 20, 30, 10, 20]), 20)

    def test_list_with_all_same_elements(self):
        self.assertIsNone(next_smallest([1, 1, 1, 1, 1]))

    def test_list_with_two_unique_elements(self):
        self.assertIsNone(next_smallest([1, 1]))

if __name__ == '__main__':
    unittest.main()

Prompt:
### Instruction:
Improve the test suite below. Add more test methods to cover missing cases.
Only output Python code, no explanation.

### Suggestions:
# - test that next_smallest([1, 2, 3, 4, 5]) returns 2
# - test that next_smallest([]) returns None
# - test that next_smallest([5, 5, 5]) returns None

### Function:
def next_smallest(lst):
    """
    You are given a list of integers.
    Write a function next_smallest() that returns the 2nd smallest element of the list.
    Return None if there is no such element.

    next_smallest([1, 2, 3, 4, 5]) == 2
    next_smallest([5, 1, 4, 3, 2]) == 2
    next_smallest([]) == None
    next_smallest([1, 1]) == None
    """
    lst = sorted(set(lst))
    return None if len(lst) < 2 else lst[1]

### Current tests:
import unittest
from target import next_smallest

class TestNextSmallest(unittest.TestCase):
    def test_basic(self):
        assert candidate([1, 2, 3, 4, 5]) == 2

### Improved tests: