def METHOD_NAME():
    X = Matrix([[1, 2], [3, 4]])
    assert sympify(X) == X.as_immutable() == ImmutableMatrix([[1, 2], [3, 4]])
    X = SparseMatrix(5, 5, {})
    assert sympify(X) == X.as_immutable() == ImmutableSparseMatrix(
        [[0 for i in range(5)] for i in range(5)])