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

    https://github.com/apache/spark/pull/18322#discussion_r122926762
  
    --- Diff: 
core/src/test/scala/org/apache/spark/deploy/master/MasterSuite.scala ---
    @@ -704,6 +707,43 @@ class MasterSuite extends SparkFunSuite
       private def getState(master: Master): RecoveryState.Value = {
         master.invokePrivate(_state())
       }
    +
    +  test("Total cores is not divisible by cores per executor") {
    --- End diff --
    
    My original thinking is that if it is possible to test wether the `if` 
branch is executed or not using `mock` and `verify`. But looks like it is not 
easy to test. Can you please investigate. 


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