def test_operation_division_second_numerator_zero_calculate_button_disabled(
self):
viewmodel = RationalNumberViewModel()
viewmodel.set_first_number("12/3")
viewmodel.set_second_number("0/1")
viewmodel.set_operation("/")
self.assertEqual("disabled", viewmodel.get_calculate_button_state())
def test_first_valid_second_valid_div_calculate(self):
viewmodel = RationalNumberViewModel()
viewmodel.set_first_number("12/3")
viewmodel.set_second_number("2/7")
viewmodel.set_operation("/")
viewmodel.calculate()
self.assertEqual("14", viewmodel.get_result())
def test_number_updated_result_empty(self):
viewmodel = RationalNumberViewModel()
viewmodel.set_first_number("12/3")
viewmodel.set_second_number("2/7")
viewmodel.set_operation("+")
viewmodel.calculate()
viewmodel.set_first_number("12/11")
self.assertEqual("", viewmodel.get_result())
def test_operation_division_second_numerator_zero_info_message_correct(
self):
viewmodel = RationalNumberViewModel()
viewmodel.set_first_number("12/3")
viewmodel.set_second_number("0/1")
viewmodel.set_operation("/")
self.assertEqual(
"Numerator of second number is zero. Division by zero is not allowed.",
viewmodel.get_info_message())
def test_operation_invalid_calculate_button_disabled(self):
viewmodel = RationalNumberViewModel()
viewmodel.set_operation("%")
self.assertEqual("disabled", viewmodel.get_calculate_button_state())
class TestViewModelFakeLogging(unittest.TestCase):
def setUp(self):
self.view_model = RationalNumberViewModel(FakeLogger())
def test_logging_init(self):
self.assertEqual("Start view",
self.view_model.logger.get_last_message())
def test_logging_first_number_is_empty(self):
self.view_model.set_second_number("3/5")
self.view_model.validate_input_numbers()
self.assertEqual("First number is empty",
self.view_model.logger.get_last_message())
def test_logging_first_number_is_invalid(self):
self.view_model.set_first_number(r"3\5")
self.view_model.set_second_number("3/5")
self.view_model.validate_input_numbers()
self.assertEqual("First number is invalid",
self.view_model.logger.get_last_message())
def test_logging_first_numbers_denominator_is_null(self):
self.view_model.set_first_number("3/0")
self.view_model.set_second_number("3/5")
self.view_model.validate_input_numbers()
self.assertEqual("Denominator of first number is zero",
self.view_model.logger.get_last_message())
def test_logging_second_number_is_empty(self):
self.view_model.set_first_number("3/5")
self.view_model.validate_input_numbers()
self.assertEqual("Second number is empty",
self.view_model.logger.get_last_message())
def test_logging_second_number_is_invalid(self):
self.view_model.set_first_number("3/5")
self.view_model.set_second_number(r"3\5")
self.view_model.validate_input_numbers()
self.assertEqual("Second number is invalid",
self.view_model.logger.get_last_message())
def test_logging_second_numbers_denominator_is_null(self):
self.view_model.set_first_number("3/5")
self.view_model.set_second_number("3/0")
self.view_model.validate_input_numbers()
self.assertEqual("Denominator of second number is zero",
self.view_model.logger.get_last_message())
def test_logging_operation_is_invalid(self):
self.view_model.set_operation("//")
self.view_model.validate_operation()
self.assertEqual("Operation // is invalid",
self.view_model.logger.get_last_message())
def test_division_by_zero(self):
self.view_model.set_first_number("3/4")
self.view_model.set_second_number("0/5")
self.view_model.set_operation("/")
self.view_model.validate_input()
self.assertEqual("Division by zero",
self.view_model.logger.get_last_message())
def test_numbers_and_operation_are_correct(self):
self.view_model.set_first_number("3/4")
self.view_model.set_second_number("3/5")
self.view_model.set_operation("*")
self.view_model.validate_input()
self.assertEqual("Operation and input numbers are correct",
self.view_model.logger.get_last_message())
def test_logger_calculate(self):
self.view_model.set_first_number("3/4")
self.view_model.set_second_number("3/5")
self.view_model.set_operation("*")
self.view_model.calculate()
self.assertEqual(
"Calculating was finished successfully. Result: 3/4 * 3/5 = 9/20",
self.view_model.logger.get_last_message())
def test_denominator_of_number_zero_calculate_button_disabled(self):
viewmodel = RationalNumberViewModel()
viewmodel.set_first_number("12/0")
viewmodel.set_second_number("2/7")
viewmodel.set_operation("+")
self.assertEqual("disabled", viewmodel.get_calculate_button_state())