def test_joining(self):
strings = [
MutableString("these"),
MutableString("are"),
MutableString("some"),
MutableString("words"),
]
self.assertEqual(" ".join(strings), "these are some words")
def test_in_place_operations(self):
string = MutableString("these are")
string2 = string
#self.assertEqual(string * 2, "these are these are")
#self.assertIs(type(string * 2), MutableString)
#self.assertEqual(string, "these are")
self.assertTrue(string2 == "these are")
string += MutableString(" words")
string += "!"
self.assertEqual(string, "these are words!")
self.assertIs(string, string2)
self.assertFalse(string2 == "these are")
string *= 2
self.assertIs(string, string2)
self.assertEqual(string, "these are words!these are words!")
def test_mutable_sequence_methods(self):
greeting = MutableString("hey")
greeting.append("!")
self.assertEqual(greeting, "hey!")
greeting.insert(-1, "a")
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_string_methods(self):
hiya = MutableString("hiya")
heya = hiya.replace('i', 'e')
self.assertEqual(heya, "heya")
self.assertIs(type(heya), MutableString)
self.assertEqual(heya.upper(), "HEYA")
self.assertIs(type(heya.lower()), MutableString)
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_into_slices(self):
greeting = MutableString("hiya")
greeting[-3:] = "ey!"
self.assertEqual(greeting, "hey!")
def test_constructor(self):
MutableString("hello")
def test_deleting_indexes_and_slices(self):
greeting = MutableString("hiya!")
del greeting[-1]
self.assertEqual(greeting, "hiya")
del greeting[:2]
self.assertEqual(greeting, "ya")
def test_slicing_works(self):
greeting = MutableString("hiya")
self.assertEqual(greeting[-3:], "iya")
self.assertIs(type(greeting[-3:]), MutableString)
def test_indexing_works(self):
greeting = MutableString("hiya")
self.assertEqual(greeting[-3], "i")
self.assertIs(type(greeting[-3]), MutableString)
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")
def test_concatenation(self):
greeting = MutableString("hello")
self.assertEqual(greeting + "!", "hello!")
self.assertEqual(greeting + MutableString("!"), "hello!")
self.assertIs(type(greeting + "!"), MutableString)
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'")
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)