def test_equality_with_unknown_type(self):
self.assertIs(MutableString("hello") == 4, False)
class SillyType:
def __eq__(self, other):
return True
self.assertEqual(MutableString("hello"), SillyType())
def test_correct_type_returned(self):
hiya = MutableString("hiya")
self.assertIs(type(hiya[-3]), MutableString)
self.assertIs(type(hiya[-3:]), MutableString)
self.assertEqual({type(c) for c in hiya}, {MutableString})
self.assertIs(type(hiya[0]), MutableString)
hiya[0] = "H"
self.assertIs(type(hiya[0]), MutableString)
self.assertIs(type(hiya + "!"), MutableString)
self.assertIs(type(hiya.replace('i', 'e')), MutableString)
self.assertIs(type(hiya.lower()), MutableString)
def test_string_methods(self):
hiya = MutableString("Hiya")
self.assertEqual(hiya.replace('i', 'e'), "Heya")
self.assertEqual(hiya.upper(), "HIYA")
self.assertEqual(hiya.lower(), "hiya")
self.assertTrue(hiya.endswith('ya'))
self.assertFalse(hiya.endswith('ye'))
self.assertTrue(hiya.endswith(('a', 'e')))
self.assertFalse(hiya.endswith(('i', 'e')))
def test_assigning_and_deleting_slices(self):
greeting = MutableString("hiya")
greeting[-3:] = "ey!"
self.assertEqual(greeting, "hey!")
del greeting[-1]
self.assertEqual(greeting, "hey")
del greeting[:2]
self.assertEqual(greeting, "y")
def test_setitem(self):
greeting = MutableString("hello world")
self.assertEqual(greeting, "hello world")
greeting[4] = "a"
self.assertEqual(greeting, "hella world")
self.assertNotEqual(greeting, "hello world")
greeting[-1] = "b"
self.assertEqual(greeting, "hella worlb")
def test_append_insert_and_pop(self):
greeting = MutableString("hey")
greeting.append("!")
self.assertEqual(greeting, "hey!")
self.assertEqual(type(greeting[-1]), MutableString)
greeting.insert(-1, "a")
self.assertEqual(greeting[-2], "a")
self.assertEqual(type(greeting[-2]), MutableString)
self.assertEqual(greeting, "heya!")
self.assertEqual(greeting.pop(-2), "a")
self.assertEqual(greeting, "hey!")
self.assertIs(type(greeting.pop()), MutableString)
self.assertEqual(greeting, "hey")
def test_constructor(self):
MutableString("hello")
MutableString(4)
def test_containment(self):
hiya = MutableString("hiya")
self.assertIn("ya", hiya)
def test_concatenation(self):
greeting = MutableString("hello")
self.assertEqual(greeting + "!", "hello!")
self.assertEqual(greeting + MutableString("!"), "hello!")
def test_iterating(self):
greeting = MutableString("hiya")
self.assertEqual(list(greeting), ['h', 'i', 'y', 'a'])
def test_slicing_works(self):
greeting = MutableString("hiya")
self.assertEqual(greeting[-3:], "iya")
def test_indexing_works(self):
greeting = MutableString("hiya")
self.assertEqual(greeting[-3], "i")
def test_has_length(self):
self.assertEqual(len(MutableString("hello")), 5)
self.assertEqual(len(MutableString("hi")), 2)
def test_string_representation(self):
self.assertEqual(str(MutableString("hello")), "hello")
self.assertEqual(repr(MutableString("hello")), "'hello'")
self.assertEqual(str(MutableString(['hi', True])), "['hi', True]")
self.assertEqual(str(MutableString(4)), "4")
def test_equality_and_inequality(self):
self.assertEqual(MutableString("hello"), "hello")
self.assertEqual(MutableString("hello"), MutableString("hello"))
self.assertNotEqual(MutableString("hello"), "hella")
self.assertNotEqual(MutableString("hello"), MutableString("hella"))
self.assertIs(MutableString("hello") == "hella", False)
self.assertIs(MutableString("hello") != "hello", False)
self.assertIs(MutableString("hello") == MutableString("hella"), False)
self.assertIs(MutableString("hello") != MutableString("hello"), False)
