def test_numbers_are_coerced_to_tuples():
assert evaluate('42') == (42.0, 0)
assert evaluate('3.14') == (3.14, 0)
def test_can_define_multiple_variables():
assert evaluate('x = 1') == (1, 0)
assert evaluate('y = 2') == (2, 0)
assert evaluate('x + y') == (3, 0)
def test_acepts_unary_operators():
assert evaluate('-20(10%)') == (-20.0, 2.0)
assert evaluate('-42') == (-42.0, 0)
assert evaluate('+20(10%)') == (20.0, 2.0)
assert evaluate('+42') == (42.0, 0)
def test_can_use_defined_variables():
assert evaluate('x = 10(0.1)') == (10.0, 0.1)
assert evaluate('x') == (10.0, 0.1)
def test_can_use_variable_in_expression():
assert evaluate('x = 1') == (1, 0)
assert evaluate('x + 1') == (2, 0)
def test_can_use_parenthesis_to_isolate_expression():
assert evaluate('(1 + 2) * 3') == (9, 0)
assert evaluate('2 * (2 + 3)') == (10, 0)
def test_variable_definition_evaluate_to_rhs():
assert evaluate('x = 10(0.1)') == (10.0, 0.1)
def test_correct_precedence_order():
assert evaluate('1 + 2 * 3') == (7, 0)
assert evaluate('1 * 2 + 3') == (5, 0)
assert evaluate('8 - 4 / 2') == (6, 0)
def test_implements_multiplication_and_division():
assert evaluate('2 * 4') == (8, 0)
assert evaluate('2(1) * 4(2)') == (8, 8)
assert evaluate('2 / 4') == (0.5, 0)
def test_implements_sum_and_subtraction():
assert evaluate('2 + 4') == (6, 0)
assert evaluate('2(0.1) + 4(0.1)') == (6, 0.2)
assert evaluate('2 - 4') == (-2, 0)
assert evaluate('2(0.1) - 4(0.1)') == (-2, 0.2)
def test_parse_number_with_relative_error():
assert evaluate('100(5%)') == (100.0, 5.0)
def test_parse_number_with_error():
assert evaluate('42(1.5)') == (42.0, 1.5)
assert evaluate('0.5(0.1)') == (0.5, 0.1)
