def test_invalid_cloning(self):
window = BufferContentWindow(1, b'abcd')
with self.assertRaises(AssertionError):
window.clone(1, 5)
with self.assertRaises(AssertionError):
window.clone(0, 1)
with self.assertRaises(AssertionError):
window.clone(5, 1)
def test_cloning(self):
window1 = BufferContentWindow(1, b'abcd')
window2 = window1.clone(2, 3)
self.assertEqual(window2.get(2, 3), b'bcd')