Github user vanzin commented on a diff in the pull request:

    https://github.com/apache/spark/pull/12568#discussion_r60623144
  
    --- Diff: 
common/network-shuffle/src/test/java/org/apache/spark/network/shuffle/ExternalShuffleIntegrationSuite.java
 ---
    @@ -186,7 +186,12 @@ public void testFetchThreeSort() throws Exception {
     
       @Test
       public void testFetchInvalidShuffle() throws Exception {
    -    registerExecutor("exec-1", dataContext0.createExecutorInfo("unknown 
sort manager"));
    +    try {
    --- End diff --
    
    Yeah, this would be better as a separate test:
    
    ```
    @Test(expect=TheExpectedException.class)
    public void testInvalidShuffleManager() {
       registerExecutor("exec-1", dataContext0.createExecutorInfo("unknown sort 
manager"));
    }
    ```
    
    (Not sure about the names of the arguments, but it's something like that.)


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