def METHOD_NAME():
    assert is_prefix("", "foo")
    assert is_prefix("foo", "foo.bar")
    assert is_prefix("foo.bar", "foo.bar.baz")
    assert not is_prefix("a", "foo.bar")
    assert not is_prefix("a.bar", "foo.bar")
    assert not is_prefix("foo.b", "foo.bar")
    assert not is_prefix("foo.bar", "foo.bar")