assertEquals("Annotation type should be CustomSize", CustomSize.class, customAnnotation.annotationType());
    }

    // Test annotation with empty keys
    public void test_annotationWithEmptyKeys() {
        final CustomSize emptyKeysAnnotation = new CustomSize() {
            @Override
            public Class<? extends Annotation> annotationType() {
                return CustomSize.class;
            }

        assertEquals("Annotation type should be UriType", UriType.class, customAnnotation.annotationType());
    }

    // Test annotation with FILE protocol type
    public void test_annotationWithFileProtocolType() {
        final UriType fileAnnotation = new UriType() {
            @Override
            public Class<? extends Annotation> annotationType() {
                return UriType.class;
            }

        }
    }

    private CustomSize createBasicAnnotation() {
        return new CustomSize() {
            @Override
            public Class<? extends Annotation> annotationType() {
                return CustomSize.class;
            }

            @Override
            public String message() {
                return "Size validation failed";
            }

    public void test_annotationTargetElements() {
        CronExpression.class.isAnnotation();
        assertTrue(CronExpression.class.isAnnotation());

        // Check that annotation can be applied to METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER
        java.lang.annotation.Target target = CronExpression.class.getAnnotation(java.lang.annotation.Target.class);
        assertNotNull(target);