private static Stream<String> nonNullEleKeys() {
        return Stream.of("httpMethodEnums", "loadBalanceEnums", "matchModeEnums", "operatorEnums", "paramTypeEnums",
                "pluginEnums", "pluginTypeEnums", "rpcTypeEnums", "selectorTypeEnums", "serializeEnums", "wafEnums",
                "redisModeEnums", "hystrixIsolationModeEnums");
    }
test element support.

@param key element key
shenyu-admin/src/test/java/org/apache/shenyu/admin/service/EnumServiceTest.java