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fe0c99f | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 | from __future__ import annotations
import sympy as sp
from core.parser import ExpressionParser
def test_preprocess_normalizes_common_unicode_tokens():
parser = ExpressionParser()
out = parser._preprocess("π × x − 1")
assert "pi" in out
assert "*" in out
assert "-" in out
def test_latex_to_sympy_string_inserts_implicit_multiplication():
parser = ExpressionParser()
out = parser._latex_to_sympy_str("2x(x+1)")
assert out == "2*x*(x+1)"
def test_parse_plain_polynomial_returns_symbol_and_variables():
parser = ExpressionParser()
result = parser.parse("x^2 + 3x + 2")
assert result["success"] is True
assert "x" in result["variables"]
assert sp.simplify(result["sympy_expr"] - (sp.Symbol("x") ** 2 + 3 * sp.Symbol("x") + 2)) == 0
def test_parse_fraction_latex_falls_back_cleanly():
parser = ExpressionParser()
result = parser.parse(r"\frac{1}{x}")
assert result["success"] is True
x = sp.Symbol("x")
assert sp.simplify(result["sympy_expr"] - (1 / x)) == 0
def test_parse_invalid_expression_returns_failure():
parser = ExpressionParser()
result = parser.parse(")))")
assert result["success"] is False
assert "error" in result
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