public static OperatorIdentifier forUid(String uid) {
        Preconditions.checkNotNull(uid);
        return new OperatorIdentifier(OperatorIDGenerator.fromUid(uid), uid);
    }
@Test
    void testForUid() {
        final String uid = "uid";
        final OperatorID operatorId = OperatorIDGenerator.fromUid(uid);

        assertThat(OperatorIdentifier.forUid(uid).getOperatorId()).isEqualTo(operatorId);
    }