Github user GJL commented on a diff in the pull request:
https://github.com/apache/flink/pull/5225#discussion_r159706927
--- Diff:
flink-clients/src/test/java/org/apache/flink/client/cli/util/DummyClusterDescriptor.java
---
@@ -0,0 +1,64 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.client.cli.util;
+
+import org.apache.flink.client.deployment.ClusterDescriptor;
+import org.apache.flink.client.deployment.ClusterSpecification;
+import org.apache.flink.client.program.ClusterClient;
+import org.apache.flink.runtime.jobgraph.JobGraph;
+import org.apache.flink.util.Preconditions;
+
+/**
+ * Dummy {@link ClusterDescriptor} implementation for testing purposes.
+ *
+ * @param <C> type of the returned {@link ClusterClient}
+ */
+public class DummyClusterDescriptor<C extends ClusterClient> implements
ClusterDescriptor<C> {
+
+ private final C clusterClient;
+
+ public DummyClusterDescriptor(C clusterClient) {
+ this.clusterClient = Preconditions.checkNotNull(clusterClient);
+ }
+
+ @Override
+ public String getClusterDescription() {
+ return null;
--- End diff --
Method is not annotated with `@Nullable` in the `ClusterDescriptor`
interface.
---
