@@ -0,0 +1,2182 @@
+/*%0A * Licensed to the Apache Software Foundation (ASF) under one%0A * or more contributor license agreements.  See the NOTICE file%0A * distributed with this work for additional information%0A * regarding copyright ownership.  The ASF licenses this file%0A * to you under the Apache License, Version 2.0 (the%0A * %22License%22); you may not use this file except in compliance%0A * with the License.  You may obtain a copy of the License at%0A *%0A *    http://www.apache.org/licenses/LICENSE-2.0%0A *%0A * Unless required by applicable law or agreed to in writing, software%0A * distributed under the License is distributed on an %22AS IS%22 BASIS,%0A * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.%0A * See the License for the specific language governing permissions and%0A * limitations under the License.%0A */%0A%0Apackage org.apache.flink.runtime.rpc;%0A%0Aimport org.apache.flink.core.testutils.CustomExtension;%0Aimport org.apache.flink.util.Preconditions;%0A%0Aimport org.junit.jupiter.api.extension.ExtensionContext;%0A%0Aimport javax.annotation.Nullable;%0A%0Aimport java.util.concurrent.CompletableFuture;%0A%0A/** Custom extension that starts a %7B@link TestingRpcService%7D. */%0Apublic class TestingRpcServiceExtension implements CustomExtension %7B%0A%0A    @Nullable private TestingRpcService testingRpcService;%0A%0A    public TestingRpcServiceExtension() %7B%0A        this.testingRpcService = null;%0A    %7D%0A%0A    public TestingRpcService getTestingRpcService() %7B%0A        Preconditions.checkNotNull(testingRpcService);%0A        return testingRpcService;%0A    %7D%0A%0A    @Override%0A    public void before(ExtensionContext extensionContext) %7B%0A        if (testingRpcService != null) %7B%0A            terminateRpcService(testingRpcService);%0A        %7D%0A%0A        testingRpcService = new TestingRpcService();%0A    %7D%0A%0A    @Override%0A    public void after(ExtensionContext extensionContext) %7B%0A        if (testingRpcService != null) %7B%0A            terminateRpcService(testingRpcService);%0A            testingRpcService = null;%0A        %7D%0A    %7D%0A%0A    private void terminateRpcService(TestingRpcService testingRpcService) %7B%0A        CompletableFuture%3CVoid%3E terminationFuture = testingRpcService.stopService();%0A        terminationFuture.join();%0A    %7D%0A%7D%0A

Add TestingRpcServiceExtension for Junit5 tests