def test_myMatrixConcatWithNone(self):
        list_a = None
        list_b = [[5, 6], [7, 8]]

        target_array = np.asarray([[5, 6],
                                   [7, 8]]);
        return_val = myMatrixConcat(list_a, list_b)
        np.testing.assert_array_equal(return_val, target_array)
    def test_myMatrixConcat(self):
        list_a = [[1, 2], [3, 4]]
        list_b = [[5, 6], [7, 8]]

        target_array = np.asarray([[1, 2],
                                   [3, 4],
                                   [5, 6],
                                   [7, 8]]);
        return_val = myMatrixConcat(list_a, list_b)
        np.testing.assert_array_equal(return_val, target_array)