@GwtIncompatible // SerializableTester
  public void testIsNull_serialization() {
    Predicate<String> pre = Predicates.isNull();
    Predicate<String> post = SerializableTester.reserializeAndAssert(pre);
    assertEquals(pre.apply("foo"), post.apply("foo"));
    assertEquals(pre.apply(null), post.apply(null));
  }

  public void testNotNull_apply() {
    Predicate<@Nullable Integer> notNull = Predicates.notNull();

        }
        return null;
    }

    // curl -XPOST -H "Authorization: CHANGEME" localhost:8080/api/admin/storage/upload/ -F path=/ -F file=@...
    // POST /api/admin/storage/upload/{pathId}/
    @Execute
    public JsonResponse<ApiResult> post$upload(final UploadForm form) {
        validateApi(form, messages -> {});
        if (form.file == null) {

            return null;
        });

        return asJson(new ApiUpdateResponse().id(fileAuth.getId()).created(true).status(Status.OK).result());
    }

    // POST /api/admin/fileauth/setting
    @Execute
    public JsonResponse<ApiResult> post$setting(final EditBody body) {
        validateApi(body, messages -> {});
        body.crudMode = CrudMode.EDIT;

            return null;
        });

        return asJson(new ApiUpdateResponse().id(webAuth.getId()).created(true).status(Status.OK).result());
    }

    // POST /api/admin/webauth/setting
    @Execute
    public JsonResponse<ApiResult> post$setting(final EditBody body) {
        validateApi(body, messages -> {});
        body.crudMode = CrudMode.EDIT;

        }
        return asJson(new ApiResult.ApiUpdateResponse().id(entity.getId()).created(true).status(ApiResult.Status.OK).result());
    }

    // POST /api/admin/group/setting
    @Execute
    public JsonResponse<ApiResult> post$setting(final EditBody body) {
        validateApi(body, messages -> {});
        validateAttributes(body.attributes, this::throwValidationErrorApi);
        body.crudMode = CrudMode.EDIT;

    public static final MojoDescriptor PRE_CLEAN = createMojoDescriptor("pre-clean");

    public static final MojoDescriptor CLEAN = createMojoDescriptor("clean");

    public static final MojoDescriptor POST_CLEAN = createMojoDescriptor("post-clean");

    // default (or at least some of them)

    public static final MojoDescriptor VALIDATE = createMojoDescriptor("validate");

            return null;
        });

        return asJson(new ApiUpdateResponse().id(labelType.getId()).created(true).status(Status.OK).result());
    }

    // POST /api/admin/labeltype/setting
    @Execute
    public JsonResponse<ApiResult> post$setting(final EditBody body) {
        validateApi(body, messages -> {});
        body.crudMode = CrudMode.EDIT;
        final LabelType labelType = getLabelType(body).map(entity -> {

                throw new DictionaryException(dictFile.getPath() + " was updated.");
            }

            // TODO use stream
            try (CurlResponse response = ComponentUtil.getCurlHelper().post("/_configsync/file").param("path", dictFile.getPath())
                    .body(FileUtil.readUTF8(file)).execute()) {
                final Map<String, Object> contentMap = response.getContent(OpenSearchCurl.jsonParser());

        return asJson(
                new ApiResult.ApiUpdateResponse().id(String.valueOf(entity.getId())).created(true).status(ApiResult.Status.OK).result());
    }

    // POST /api/admin/dict/protwords/setting/{dictId}
    @Execute
    public JsonResponse<ApiResult> post$setting(final String dictId, final EditBody body) {
        body.dictId = dictId;
        validateApi(body, messages -> {});
        body.crudMode = CrudMode.EDIT;

        }
        return asJson(new ApiResult.ApiUpdateResponse().id(entity.getId()).created(true).status(ApiResult.Status.OK).result());
    }

    // POST /api/admin/role/setting
    @Execute
    public JsonResponse<ApiResult> post$setting(final EditBody body) {
        validateApi(body, messages -> {});
        body.crudMode = CrudMode.EDIT;
        final Role entity = getRole(body).orElseGet(() -> {