def METHOD_NAME():
    assert rel_path("", "foo.bar.baz") == "foo.bar.baz"
    assert rel_path("foo", "foo.bar.baz") == "bar.baz"
    assert rel_path("foo.bar", "foo.bar.baz") == "baz"
    assert rel_path("foo.bar.baz", "foo.bar.baz") == ""
    assert rel_path("", "") == ""