def test_getitem(self):
obj = ArrayOperations()
obj.append(20)
obj.append(40)
with self.assertRaises(IndexError):
obj.__getitem__(
2
) # Case_1: Index 2 is out of range since count is 2, only index 0 and 1 exist, hence indexerror will be raised
self.assertLess(
1, len(obj)
) # Case_2: Index 1 is in range, as two items apppended to give self.count = 2 (index < count i.e. index in range)
with self.assertRaises(IndexError):
obj.__getitem__(
-1
) # Case_3: Accounting for negative indexes which are also out of range
def test_remove(self):
obj = ArrayOperations()
obj.append(30)
obj.append(40)
obj.append(50)
obj.remove(40)
self.assertEqual(
2, len(obj)
) # Case_1: checks whether the delete function works by comparing whether the count is equal to length after deleting an item at index 1
self.assertEqual(
50, obj.__getitem__(1)
) # Case_2: Checks whether the list has shifted after deletion of an item, this test proves that 50 has moved to index 1 from index 2
with self.assertRaises(
ValueError
): # Case_3: Since 6 does not exist as an item in the list, the ValueError is raised.
obj.remove(6)
def test_delete(self):
obj = ArrayOperations()
obj.append(30)
obj.append(40)
obj.append(50) # obj count initially 3
obj.delete(1) # after delete obj count 2
self.assertEqual(
2, len(obj)
) # Case_1: checks whether the delete function works by comparing whether the count is equal to length after deleting an item at index 1
self.assertEqual(
50, obj.__getitem__(1)
) # Case_2: Checks whether the list has shifted after deletion of an item, this test proves that 50 has moved to index 1 from index 2
with self.assertRaises(IndexError):
obj.delete(
3
) # Case_3: Checks whether the index is less than the count to check if index is valid