def test_append_doubles_array_capacity_if_capacity_reached(self):
da = DynamicArray()
da._n = 2
da._capacity = 2
da._A = da._make_array(da._capacity)
da._A[0:2] = ['foo', 'bar']
expected_result = 4
da.append('spam')
result = da._capacity
self.assertEqual(result, expected_result)
def test_append_adds_object_at_end_of_array(self):
da = DynamicArray()
expected_result = 'foo'
da.append(expected_result)
self.assertEqual(da._A[-1], expected_result)
self.assertEqual(da._n, 1)
expected_result = 'bar'
da.append(expected_result)
self.assertEqual(da._A[-1], expected_result)
self.assertEqual(da._n, 2)