def METHOD_NAME(self):
    a = [[[1, 2, 3], [4, 5, 6]], [[7, 8, 9], [10, 11, 12]]]
    b = [1, 2, 3]
    c = [[1, 2], [3, 4]]
    for m in (a, b, c):
        self.assertEqualArrays(stack(*unstack(m)), m)