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import numpy as np
import pytest
from manim.mobject.matrix import (
DecimalMatrix,
IntegerMatrix,
Matrix,
)
from manim.mobject.text.tex_mobject import MathTex
from manim.mobject.types.vectorized_mobject import VGroup
class TestMatrix:
@pytest.mark.parametrize(
(
"matrix_elements",
"left_bracket",
"right_bracket",
"expected_rows",
"expected_columns",
),
[
([[1, 2], [3, 4]], "[", "]", 2, 2),
([[1, 2, 3]], "[", "]", 1, 3),
([[1], [2], [3]], "[", "]", 3, 1),
([[5]], "[", "]", 1, 1),
([[1, 0], [0, 1]], "(", ")", 2, 2),
([["a", "b"], ["c", "d"]], "[", "]", 2, 2),
(np.array([[10, 20], [30, 40]]), "[", "]", 2, 2),
],
ids=[
"2x2_default",
"1x3_default",
"3x1_default",
"1x1_default",
"2x2_parentheses",
"2x2_strings",
"2x2_numpy",
],
)
def test_matrix_init_valid(
self,
matrix_elements,
left_bracket,
right_bracket,
expected_rows,
expected_columns,
):
matrix = Matrix(
matrix_elements, left_bracket=left_bracket, right_bracket=right_bracket
)
assert isinstance(matrix, Matrix)
assert matrix.left_bracket == left_bracket
assert matrix.right_bracket == right_bracket
assert len(matrix.get_rows()) == expected_rows
assert len(matrix.get_columns()) == expected_columns
@pytest.mark.parametrize(
("invalid_elements", "expected_error"),
[
(10, TypeError),
(10.4, TypeError),
([1, 2, 3], TypeError),
],
ids=[
"integer",
"float",
"flat_list",
],
)
def test_matrix_init_invalid(self, invalid_elements, expected_error):
with pytest.raises(expected_error):
Matrix(invalid_elements)
@pytest.mark.parametrize(
("matrix_elements", "expected_columns"),
[
([[1, 2], [3, 4]], 2),
([[1, 2, 3]], 3),
([[1], [2], [3]], 1),
],
ids=["2x2", "1x3", "3x1"],
)
def test_get_columns(self, matrix_elements, expected_columns):
matrix = Matrix(matrix_elements)
assert isinstance(matrix, Matrix)
assert len(matrix.get_columns()) == expected_columns
for column in matrix.get_columns():
assert isinstance(column, VGroup)
@pytest.mark.parametrize(
("matrix_elements", "expected_rows"),
[
([[1, 2], [3, 4]], 2),
([[1, 2, 3]], 1),
([[1], [2], [3]], 3),
],
ids=["2x2", "1x3", "3x1"],
)
def test_get_rows(self, matrix_elements, expected_rows):
matrix = Matrix(matrix_elements)
assert isinstance(matrix, Matrix)
assert len(matrix.get_rows()) == expected_rows
for row in matrix.get_rows():
assert isinstance(row, VGroup)
@pytest.mark.parametrize(
("matrix_elements", "expected_entries_tex_string", "expected_entries_count"),
[
([[1, 2], [3, 4]], ["1", "2", "3", "4"], 4),
([[1, 2, 3]], ["1", "2", "3"], 3),
],
ids=["2x2", "1x3"],
)
def test_get_entries(
self, matrix_elements, expected_entries_tex_string, expected_entries_count
):
matrix = Matrix(matrix_elements)
entries = matrix.get_entries()
assert isinstance(matrix, Matrix)
assert len(entries) == expected_entries_count
for index_entry, entry in enumerate(entries):
assert isinstance(entry, MathTex)
assert expected_entries_tex_string[index_entry] == entry.tex_string
@pytest.mark.parametrize(
("matrix_elements", "row", "column", "expected_value_str"),
[
([[1, 2], [3, 4]], 0, 0, "1"),
([[1, 2], [3, 4]], 1, 1, "4"),
([[1, 2, 3]], 0, 2, "3"),
([[1], [2], [3]], 2, 0, "3"),
],
ids=["2x2_00", "2x2_11", "1x3_02", "3x1_20"],
)
def test_get_element(self, matrix_elements, row, column, expected_value_str):
matrix = Matrix(matrix_elements)
assert isinstance(matrix.get_columns()[column][row], MathTex)
assert isinstance(matrix.get_rows()[row][column], MathTex)
assert matrix.get_columns()[column][row].tex_string == expected_value_str
assert matrix.get_rows()[row][column].tex_string == expected_value_str
@pytest.mark.parametrize(
("matrix_elements", "row", "column", "expected_error"),
[
([[1, 2]], 1, 0, IndexError),
([[1, 2]], 0, 2, IndexError),
],
ids=["row_out_of_bounds", "col_out_of_bounds"],
)
def test_get_element_invalid(self, matrix_elements, row, column, expected_error):
matrix = Matrix(matrix_elements)
with pytest.raises(expected_error):
matrix.get_columns()[column][row]
with pytest.raises(expected_error):
matrix.get_rows()[row][column]
class TestDecimalMatrix:
@pytest.mark.parametrize(
("matrix_elements", "num_decimal_places", "expected_elements"),
[
([[1.234, 5.678], [9.012, 3.456]], 2, [[1.234, 5.678], [9.012, 3.456]]),
([[1.0, 2.0], [3.0, 4.0]], 0, [[1, 2], [3, 4]]),
([[1, 2.3], [4.567, 7]], 1, [[1.0, 2.3], [4.567, 7.0]]),
],
ids=[
"basic_2_decimal_points",
"basic_0_decimal_points",
"mixed_1_decimal_points",
],
)
def test_decimal_matrix_init(
self, matrix_elements, num_decimal_places, expected_elements
):
matrix = DecimalMatrix(
matrix_elements,
element_to_mobject_config={"num_decimal_places": num_decimal_places},
)
assert isinstance(matrix, DecimalMatrix)
for column_index, column in enumerate(matrix.get_columns()):
for row_index, element in enumerate(column):
assert element.number == expected_elements[row_index][column_index]
assert element.num_decimal_places == num_decimal_places
class TestIntegerMatrix:
@pytest.mark.parametrize(
("matrix_elements", "expected_elements"),
[
([[1, 2], [3, 4]], [[1, 2], [3, 4]]),
([[1.2, 2.8], [3.5, 4]], [[1.2, 2.8], [3.5, 4]]),
],
ids=["basic_int", "mixed_float_int"],
)
def test_integer_matrix_init(self, matrix_elements, expected_elements):
matrix = IntegerMatrix(matrix_elements)
assert isinstance(matrix, IntegerMatrix)
for row_index, row in enumerate(matrix.get_rows()):
for column_index, element in enumerate(row):
assert element.number == expected_elements[row_index][column_index]
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