Github user pnowojski commented on a diff in the pull request:
https://github.com/apache/flink/pull/4761#discussion_r154025597
--- Diff:
flink-runtime/src/test/java/org/apache/flink/runtime/io/network/TaskEventDispatcherTest.java
---
@@ -0,0 +1,168 @@
+/*
+ * 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.runtime.io.network;
+
+import org.apache.flink.runtime.event.TaskEvent;
+import org.apache.flink.runtime.io.network.partition.ResultPartitionID;
+import org.apache.flink.runtime.iterative.event.AllWorkersDoneEvent;
+import org.apache.flink.runtime.iterative.event.TerminationEvent;
+import org.apache.flink.runtime.util.event.EventListener;
+import org.apache.flink.util.TestLogger;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+
+import static junit.framework.TestCase.assertTrue;
+import static org.junit.Assert.assertFalse;
+import static org.mockito.Matchers.any;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+
+/**
+ * Basic tests for {@link TaskEventDispatcher}.
+ */
+public class TaskEventDispatcherTest extends TestLogger {
+
+ @Rule
+ public ExpectedException expectedException = ExpectedException.none();
+
+ @Test
+ public void registerPartitionTwice() throws Exception {
+ ResultPartitionID partitionId = new ResultPartitionID();
+ TaskEventDispatcher ted = new TaskEventDispatcher();
+ ted.registerPartition(partitionId);
+
+ expectedException.expect(IllegalStateException.class);
+ expectedException.expectMessage("already registered at task
event dispatcher");
+
+ ted.registerPartition(partitionId);
+ }
+
+ @Test
+ public void subscribeToEventNotRegistered() throws Exception {
+ TaskEventDispatcher ted = new TaskEventDispatcher();
+
+ expectedException.expect(IllegalStateException.class);
+ expectedException.expectMessage("not registered at task event
dispatcher");
+
+ //noinspection unchecked
+ ted.subscribeToEvent(new ResultPartitionID(),
mock(EventListener.class), TaskEvent.class);
+ }
+
+ /**
+ * Tests {@link TaskEventDispatcher#publish(ResultPartitionID,
TaskEvent)} and {@link TaskEventDispatcher#subscribeToEvent(ResultPartitionID,
EventListener, Class)} methods.
+ */
+ @Test
--- End diff --
Guess what? :)
```
private static OneShotEventListener extends EventListener<TaskEvent> {
private final TaskEvent expected;
private boolean fired = false;
public OneShotEventListener(TaskEvent expected) {
...
}
public void onEvent(TaskEvent actual) {
checkState(!fired);
fired = true;
checkArgument(actual == expected);
}
}
private static ZeroShotEventListener extends EventListener<TaskEvent> {
public void onEvent(TaskEvent actual) {
throw new IllegalStateException();
}
}
```
---
