@Override
    public boolean processArgument(final ShenyuRequest shenyuRequest, final Annotation annotation, final Object arg) {
        if (arg instanceof String) {
            shenyuRequest.setBody((String) arg);
        } else {
            shenyuRequest.setBody(JsonUtils.toJson(arg));
        }
        return true;
    }
@Test
    public void processArgumentNullTest() {
        final RequestBody body = mock(RequestBody.class);
        processor.processArgument(request, body, "");

        assertEquals(request.getBody(), "");
    }