Github user sihuazhou commented on a diff in the pull request: https://github.com/apache/flink/pull/5881#discussion_r183267016 --- Diff: flink-yarn/src/test/java/org/apache/flink/yarn/YarnResourceManagerTest.java --- @@ -388,4 +390,108 @@ public void testStopWorker() throws Exception { assertTrue(resourceManager.getNumberOfRegisteredTaskManagers().get() == 0); }}; } + + /** + * Tests the case that containers are killed before registering with ResourceManager successfully. + */ + @Test + public void testKillContainerBeforeTMRegisterSuccessfully() throws Exception { --- End diff -- Hmm...most code of this test is mirror from an another test `testStopWorker()` in this class. I agreed that itâs a bit complicated but it's logical could ensure that we can test the corner situation properly (the container is killed before registering successfully). TBH, I don't know how to make sure this the corner situation can be test, I think I'm a bit fool here... could you give me some more detail advice?
---