def test_validate_sum_function(): assert verify_functions('sum') == 'sum'
def test_invalidate_power_function(): with pytest.raises(ValidationError): verify_functions('power')
def test_invalidate_square_function(): with pytest.raises(ValidationError): verify_functions('square')
def test_validate_divide_function(): assert verify_functions('divide') == 'divide'
def test_validate_multiply_function(): assert verify_functions('multiply') == 'multiply'
def test_validate_subtract_function(): assert verify_functions('subtract') == 'subtract'