class GUIView(tk.Frame):
CAST_TYPES = ['fahrenheit', 'kelvin', 'newton']
view_model = TemperatureConverterViewModel()
def convert(self):
self.view_model.set_input_value(self.text_value.get(1.0, tk.END))
self.view_model.set_cast_type(self.CAST_TYPES[self.cast_types.current()])
self.view_model.convert()
self.result_label.configure(text=self.view_model.get_output_value())
self.error_label.configure(text=self.view_model.get_error())
def __init__(self):
tk.Frame.__init__(self)
self.master.title("Temperature converter")
self.master.minsize(width=150, height=150)
self.grid(sticky=tk.W + tk.E + tk.N + tk.S)
self.celsius_label = tk.Label(self, text="From celsius", fg='black', font="Arial 14")
self.celsius_label.pack()
self.text_value = tk.Text(self, height=1, width=30, font="Arial 14")
self.text_value.pack()
self.cast_types_label = tk.Label(self, text="to", fg='black', font="Arial 14")
self.cast_types_label.pack()
self.cast_types = ttk.Combobox(self, height=1, width=30, values=self.CAST_TYPES, font="Arial 14")
self.cast_types.current(0)
self.cast_types.pack()
self.convert = tk.Button(self, text="convert", width=15, height=1, font="Arial 14", bg="light blue",
command=self.convert)
self.convert.pack()
self.result_label = tk.Label(self, text="", fg='black', font="Arial 14")
self.result_label.pack()
self.error_label = tk.Label(self, text="", fg='black', font="Arial 14")
self.error_label.pack()
def test_clear_error(self):
view_model = TemperatureConverterViewModel()
view_model.set_input_value("some not a number string")
view_model.convert()
view_model.clear_error()
self.assertEqual(view_model.get_error(), '')
def test_preset_cast_type(self):
view_model = TemperatureConverterViewModel()
self.assertEqual(view_model.cast_type, 'fahrenheit')
def test_output_converting_case_nan(self):
view_model = TemperatureConverterViewModel()
view_model.set_input_value("some not a number string")
view_model.convert()
self.assertEqual(view_model.get_output_value(), '')
def test_clear_output(self):
view_model = TemperatureConverterViewModel()
view_model.set_input_value("-13,5")
view_model.set_cast_type("newton")
view_model.convert()
view_model.clear_output()
self.assertEqual(view_model.get_output_value(), '')
def test_error_converting_case_nan(self):
view_model = TemperatureConverterViewModel()
view_model.set_input_value("some not a number string")
view_model.convert()
self.assertEqual(view_model.get_error(),
"The value is not numeric.\nEnter a numeric value.")
def test_create_view_model(self):
view_model = TemperatureConverterViewModel()
self.assertTrue(isinstance(view_model, TemperatureConverterViewModel))
def test_converting_case_newton(self):
view_model = TemperatureConverterViewModel()
view_model.set_input_value("-13,5")
view_model.set_cast_type("newton")
view_model.convert()
self.assertAlmostEqual(view_model.get_output_value(), -4.455)
def test_converting_case_kelvin(self):
view_model = TemperatureConverterViewModel()
view_model.set_input_value("-13,5")
view_model.set_cast_type("kelvin")
view_model.convert()
self.assertAlmostEqual(view_model.get_output_value(), 259.65)
def test_converting_case_fahrenheit(self):
view_model = TemperatureConverterViewModel()
view_model.set_input_value("-13,5")
view_model.convert()
self.assertAlmostEqual(view_model.get_output_value(), 7.7)
def test_cast_type_setter(self):
view_model = TemperatureConverterViewModel()
view_model.set_cast_type('newton')
self.assertEqual(view_model.get_cast_type(), 'newton')
def test_input_value_setter(self):
view_model = TemperatureConverterViewModel()
view_model.set_input_value(15.8)
self.assertEqual(view_model.get_input_value(), 15.8)