assertTrue("Empty maxKey should match StringUtil.EMPTY", StringUtil.EMPTY.equals(emptyKeysAnnotation.maxKey()));
    }

    // Test annotation with multiple groups and payloads
    public void test_annotationWithMultipleGroupsAndPayloads() {
        final CustomSize multiAnnotation = new CustomSize() {
            @Override
            public Class<? extends Annotation> annotationType() {
                return CustomSize.class;

        assertEquals("Payload should be empty", 0, fileAnnotation.payload().length);
    }

    // Test annotation with multiple groups and payloads
    public void test_annotationWithMultipleGroupsAndPayloads() {
        final UriType multiAnnotation = new UriType() {
            @Override
            public Class<? extends Annotation> annotationType() {
                return UriType.class;
            }