private static void assertExistJSONField(Method[] declaredMethods) {
        Optional<JSONField> jsonField = Arrays.stream(declaredMethods)
                .map(method -> BeanUtils.findAnnotation(method, JSONField.class))
                .filter(Objects::nonNull)
                .findAny();
        assertTrue(jsonField.isPresent());
    }
Test for {@link JSONField}

@author lzhpo
core/src/test/java/com/alibaba/fastjson2/annotation/JSONFieldCombinationTest.java