def test_when_all_incorrect(self):
test_example = DebtViewModel(req_sum='@@',
percent_rate=-55,
period=44,
year=-000)
self.assertTrue('Error: Incorrect input',
test_example.get_error_message())
def test_when_period_incorrect(self):
test_example = DebtViewModel(req_sum=200000,
percent_rate=0.14,
period=4,
year=4)
test_example.set_period(-5)
self.assertTrue('Error: Incorrect input',
test_example.get_error_message())
def test_equal_amounts_repayment_for_3_year(self):
test_example = DebtViewModel(req_sum=200000,
percent_rate=0.14,
period=4,
year=3)
test_example.perform_repayment('equal_amounts')
payment = test_example.get_payment()
expenses = test_example.get_expenses()
answer = 'Payment: 64000 - Expenses: 50000'
self.assertEqual(
answer,
'Payment: {:.0f} - Expenses: {:.0f}'.format(payment, expenses))
class GUIView:
view_model = DebtViewModel()
default_sticky = tk.W + tk.E + tk.N + tk.S
def __init__(self):
self.window = tk.Tk()
self.window.title('Debt servicing expenses')
self.window.geometry('600x250')
self.window.resizable(width=False, height=False)
self.frame = tk.Frame(self.window, bg='ghost white')
self.frame.pack(fill="both", expand=True)
self.title = tk.Label(
master=self.frame,
text='Enter "Required Sum", "Percent rate", "Period" and "Year" :',
bg='purple1')
self.req_sum_value = tk.Entry(self.frame, bg='white')
self.percent_rate_value = tk.Entry(self.frame, bg='white')
self.period_value = tk.Entry(self.frame, bg='white')
self.year_value = tk.Entry(self.frame, bg='white')
self.amounts_res_button = tk.Button(
self.frame, text='Calculate Equal amounts repayment', bg='snow2')
self.payments_res_button = tk.Button(
self.frame, text='Calculate Equal payments repayment', bg='snow2')
self.res = tk.Label(self.frame,
text='Result : ',
bg='pale green',
font=32)
self.error_field = tk.Label(self.frame,
text='',
font=28,
bg='ghost white')
self.setup_grid()
self.bind_events()
self.view_bind()
self.view_back_bind()
self.window.mainloop()
def setup_grid(self):
self.frame.place(relx=0, rely=0, relwidth=1, relheight=1)
self.title.grid(row=0, column=0, columnspan=4)
self.req_sum_value.grid(row=1, column=1, sticky=self.default_sticky)
self.percent_rate_value.grid(row=1,
column=2,
sticky=self.default_sticky)
self.period_value.grid(row=2, column=1, sticky=self.default_sticky)
self.year_value.grid(row=2, column=2, sticky=self.default_sticky)
self.amounts_res_button.grid(row=3,
column=1,
sticky=self.default_sticky)
self.payments_res_button.grid(row=3,
column=3,
sticky=self.default_sticky)
self.res.grid(row=4,
column=0,
columnspan=4,
rowspan=4,
sticky=self.default_sticky)
self.error_field.grid(row=8,
column=0,
columnspan=4,
sticky=self.default_sticky)
def bind_events(self):
self.req_sum_value.bind('<KeyRelease>', self.change_req_sum)
self.percent_rate_value.bind('<KeyRelease>', self.change_percent_rate)
self.period_value.bind('<KeyRelease>', self.change_period)
self.year_value.bind('<KeyRelease>', self.change_year)
self.amounts_res_button.bind('<Button-1>',
self.amounts_res_button_clicked)
self.payments_res_button.bind('<Button-1>',
self.payments_res_button_clicked)
def amounts_res_button_clicked(self, event):
self.view_bind()
self.view_model.perform_repayment('equal_amounts')
self.view_back_bind()
def payments_res_button_clicked(self, event):
self.view_bind()
self.view_model.perform_repayment('equal_payments')
self.view_back_bind()
def change_req_sum(self, event):
self.view_bind()
self.view_back_bind()
def change_percent_rate(self, event):
self.view_bind()
self.view_back_bind()
def change_period(self, event):
self.view_bind()
self.view_back_bind()
def change_year(self, event):
self.view_bind()
self.view_back_bind()
def view_bind(self):
self.view_model.set_req_sum(self.req_sum_value.get())
self.view_model.set_percent_rate(self.percent_rate_value.get())
self.view_model.set_period(self.period_value.get())
self.view_model.set_year(self.year_value.get())
def view_back_bind(self):
self.req_sum_value.delete(0, tk.END)
self.req_sum_value.insert(tk.END, self.view_model.get_req_sum())
self.percent_rate_value.delete(0, tk.END)
self.percent_rate_value.insert(tk.END,
self.view_model.get_percent_rate())
self.period_value.delete(0, tk.END)
self.period_value.insert(tk.END, self.view_model.get_period())
self.year_value.delete(0, tk.END)
self.year_value.insert(tk.END, self.view_model.get_year())
payment = self.view_model.get_payment()
expenses = self.view_model.get_expenses()
self.res.config(text='Payment: {:.0f} - Expenses: {:.0f}'.format(
payment if payment else '', expenses if expenses else ''))
error_msg = self.view_model.get_error_message()
self.error_field.config(
text='{}'.format(error_msg if error_msg else 'Normal work'))
def test_by_default_error_is_true(self):
test_example = DebtViewModel()
self.assertEqual('Please enter data', test_example.get_error_message())
def test_when_enter_data(self):
test_example = DebtViewModel(req_sum=200000,
percent_rate=0.14,
period=4,
year=4)
self.assertTrue('Normal work', test_example.get_error_message())