self.assertAllEqual(
        np_array_ops.pad(t, paddings, 'constant'),
        [[0, 0, 0, 0, 0, 0, 0], [0, 0, 1, 2, 3, 0, 0], [0, 0, 4, 5, 6, 0, 0],
         [0, 0, 0, 0, 0, 0, 0]])