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_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_denominators_of_numbers_are_zero_info_message_correct(self):
viewmodel = RationalNumberViewModel()
viewmodel.set_first_number("13/0")
viewmodel.set_second_number("7/0")
self.assertEqual(
"Denominator of first number is zero.Denominator of second number is zero.",
viewmodel.get_info_message())
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_calculate_button_disabled_by_default(self):
viewmodel = RationalNumberViewModel()
self.assertEqual("disabled", viewmodel.get_calculate_button_state())
def test_operation_invalid_calculate_button_disabled(self):
viewmodel = RationalNumberViewModel()
viewmodel.set_operation("%")
self.assertEqual("disabled", viewmodel.get_calculate_button_state())
def test_first_invalid_second_invalid_info_correct(self):
viewmodel = RationalNumberViewModel()
viewmodel.set_first_number("aaa")
viewmodel.set_second_number("bbbb")
self.assertEqual("First number is invalid.Second number is invalid.",
viewmodel.get_info_message())
def test_first_valid_second_empty_info_correct(self):
viewmodel = RationalNumberViewModel()
viewmodel.set_first_number("3/4")
viewmodel.set_second_number("")
self.assertEqual("Second number is empty.",
viewmodel.get_info_message())
def test_first_valid_second_valid_info_empty(self):
viewmodel = RationalNumberViewModel()
viewmodel.set_first_number("12/3")
viewmodel.set_second_number("2/7")
self.assertEqual("", viewmodel.get_info_message())
def test_numbers_invalid_calculate_button_disabled(self):
viewmodel = RationalNumberViewModel()
viewmodel.set_first_number("a")
viewmodel.set_second_number("2/7")
self.assertEqual("disabled", viewmodel.get_calculate_button_state())
def setUp(self):
self.view_model = RationalNumberViewModel(RealLogger())
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_numbers_filled_calculate_button_enabled(self):
viewmodel = RationalNumberViewModel()
viewmodel.set_first_number("1/2")
viewmodel.set_second_number("2/7")
self.assertEqual("normal", viewmodel.get_calculate_button_state())
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_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())
class GUIView(ttk.Frame):
N_LOG_MESSAGES_TO_DISPLAY = 10
default_sticky = tkinter.W + tkinter.E + tkinter.N + tkinter.S
viewmodel = RationalNumberViewModel()
def set_weight_to_grid(self):
self.rowconfigure(0, weight=1)
self.rowconfigure(1, weight=1)
self.rowconfigure(2, weight=1)
self.rowconfigure(3, weight=1)
self.columnconfigure(0, weight=1)
self.columnconfigure(1, weight=1)
self.columnconfigure(2, weight=1)
self.columnconfigure(3, weight=1)
self.columnconfigure(4, weight=1)
def bind_events(self):
self.txt_first_number.bind('<KeyRelease>',
self.txt_first_number_changed)
self.txt_second_number.bind('<KeyRelease>',
self.txt_second_number_changed)
self.cmb_operation.bind('<<ComboboxSelected>>', self.operation_changed)
self.btn_calculate.bind('<Button-1>', self.calculate_clicked)
def mvvm_bind(self):
self.viewmodel.set_first_number(
self.txt_first_number.get("1.0", tkinter.END))
self.viewmodel.set_second_number(
self.txt_second_number.get("1.0", tkinter.END))
self.viewmodel.set_operation(self.cmb_operation.get())
def mvvm_back_bind(self):
self.btn_calculate.config(
state=self.viewmodel.get_calculate_button_state())
self.lbl_message.config(text=self.viewmodel.get_info_message())
self.lbl_result.config(text=self.viewmodel.get_result())
log_messages = self.viewmodel.logger.get_log_messages()
logger_text = '\n'.join(
log_messages[:-self.N_LOG_MESSAGES_TO_DISPLAY:-1])
self.lbl_log.config(text=logger_text)
def __init__(self):
ttk.Frame.__init__(self)
self.master.title("Rational number calculator")
self.master.rowconfigure(0, weight=1)
self.master.columnconfigure(0, weight=5)
self.grid(sticky=self.default_sticky)
self.txt_first_number = tkinter.Text(self,
height=1,
width=10,
borderwidth=2,
relief="groove")
self.txt_first_number.grid(row=0, column=0, sticky=self.default_sticky)
self.cmb_operation = ttk.Combobox(
self,
height=1,
width=5,
values=RationalNumberViewModel.VALID_OPERATIONS,
state="readonly")
self.cmb_operation.current(0)
self.cmb_operation.grid(row=0, column=1, sticky=self.default_sticky)
self.txt_second_number = tkinter.Text(self,
height=1,
width=10,
borderwidth=2,
relief="groove")
self.txt_second_number.grid(row=0,
column=2,
sticky=self.default_sticky)
self.lbl_equal_to = tkinter.Label(self,
text="=",
height=1,
width=5,
borderwidth=2,
relief="groove")
self.lbl_equal_to.grid(row=0, column=3, sticky=self.default_sticky)
self.lbl_result = tkinter.Label(self,
text="",
height=1,
width=10,
borderwidth=2,
relief="groove")
self.lbl_result.grid(row=0, column=4, sticky=self.default_sticky)
self.btn_calculate = ttk.Button(self, text='Calculate')
self.btn_calculate.grid(row=1,
column=1,
columnspan=3,
sticky=self.default_sticky)
self.lbl_message = ttk.Label(self, text="Info box")
self.lbl_message.grid(row=2,
column=0,
columnspan=5,
sticky=tkinter.W + tkinter.N)
self.lbl_log = tkinter.Label(self.master, text="Here will be log")
self.lbl_log.grid(row=3,
column=0,
columnspan=5,
sticky=tkinter.W + tkinter.N)
self.bind_events()
self.set_weight_to_grid()
self.mvvm_back_bind()
def calculate_clicked(self, event):
self.mvvm_bind()
self.viewmodel.calculate()
self.mvvm_back_bind()
def txt_first_number_changed(self, event):
self.mvvm_bind()
self.mvvm_back_bind()
def txt_second_number_changed(self, event):
self.mvvm_bind()
self.mvvm_back_bind()
def operation_changed(self, event):
self.mvvm_bind()
self.mvvm_back_bind()
