Github user JoshRosen commented on a diff in the pull request: https://github.com/apache/spark/pull/6707#discussion_r52854252 --- Diff: streaming/src/test/scala/org/apache/spark/streaming/ReceivedBlockHandlerSuite.scala --- @@ -174,6 +176,130 @@ class ReceivedBlockHandlerSuite } } + test("Test Block - count messages") { + // Test count with BlockManagedBasedBlockHandler + testCountWithBlockManagerBasedBlockHandler(true) --- End diff -- This method of switching the handlers in tests is also bad because it doesn't generalize to handle a third type of handler. Instead, I think it would have been better to just pass in either `withWriteAheadLogBasedBlockHandler` or `withWriteAheadLogBasedBlockHandler` into some function, since both of those methods are instances of a common function supertype. Higher-order functions are a great language feature and should be used more in test code where appropriate.
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