class CalculatorGUI(Frame):
def __init__(self, master=None):
Frame.__init__(self, master)
self.calculator=CalculatorModel()
self.calculator.addObserver(self)
self.pack()
self._create_widgets()
def _create_widgets(self):
self.Display = Entry(self)
self.Display.pack({"side": "left"})
Operators = Frame(self)
self.PlusBtn = Button(Operators)
self.PlusBtn["text"] = "+"
self.PlusBtn["command"] = self.press_plus
self.PlusBtn.pack({"side": "left"})
self.MinusBtn = Button(Operators)
self.MinusBtn["text"] = "-"
self.MinusBtn["command"] = None
self.MinusBtn.pack({"side": "left"})
self.EqualsBtn = Button(Operators)
self.EqualsBtn["text"] = "="
self.EqualsBtn["command"] = self.press_equal
self.EqualsBtn.pack({"side": "left"})
Operators.pack()
Digits = Frame(self)
self.DigitBtn = []
for i in range(0,10):
TheButton = Button(Digits, text=str(i))
TheButton.pack(side=LEFT)
self.DigitBtn = self.DigitBtn + [TheButton]
Digits.pack()
self.DigitBtn[0]["command"] = lambda: self.press_digit(0)
self.DigitBtn[1]["command"] = lambda: self.press_digit(1)
self.DigitBtn[2]["command"] = lambda: self.press_digit(2)
self.DigitBtn[3]["command"] = lambda: self.press_digit(3)
self.DigitBtn[4]["command"] = lambda: self.press_digit(4)
self.DigitBtn[5]["command"] = lambda: self.press_digit(5)
self.DigitBtn[6]["command"] = lambda: self.press_digit(6)
self.DigitBtn[7]["command"] = lambda: self.press_digit(7)
self.DigitBtn[8]["command"] = lambda: self.press_digit(8)
self.DigitBtn[9]["command"] = lambda: self.press_digit(9)
def update(self):
self.Display.delete(0, END)
self.Display.insert(0, self.calculator.display())
print(self.calculator.display())
def press_digit(self, digit):
self.calculator.press_digit(digit)
def press_plus(self):
self.calculator.press_plus()
def press_equal(self):
self.calculator.press_equals()
class TestCalc( unittest.TestCase ):
def setUp(self):
self.c = CalculatorModel()
def tearDown(self):
self.c = None
def test_work(self):
print(self)
def test_fail(self):
self.assertTrue(not False)
def testShouldShowZeroWhenInitialized(self):
self.assertEqual("0", self.c.display())
def testShouldReturnOneWhenOneIsPressed(self):
self.c.press_digit(1);
self.assertEqual("1", self.c.display())
def testShouldReturnTwoWhenOnePlusOne(self):
self.c.press_digit(1);
self.assertEqual("1", self.c.display())
self.c.press_plus();
self.assertEqual("1", self.c.display())
self.c.press_digit(1);
self.assertEqual("1", self.c.display())
self.c.press_equals();
self.assertEqual("2", self.c.display())
def testMinus(self):
self.c.press_minus()
self.c.press_digit(1)
self.c.press_equals()
self.assertEqual("-1", self.c.display())
def testMult(self):
self.c.press_digit(2)
self.c.press_mult()
self.c.press_digit(2)
self.c.press_equals()
self.assertEqual("4", self.c.display(), "2*2=4")
def testShouldRefuseStrings(self):
self.assertRaises(CalcError, self.c.press_digit, "aas")
def testShouldRefuseMoreThanOneDigit(self):
self.assertRaises(CalcError, self.c.press_digit, 99)