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One invariant of our AuctionSearch is that it noti es the consumer just once when the search has nished, no matter how many AuctionHouses it searches that is, no matter how many threads its starts We can use jMock to write a stress test for this invariant We don t always use jMock for stress tests because expectation failures interfere with the threads of the object under test On the other hand, jMock reports the actual sequence of calls to its mock objects when there is a failure, which helps diagnose defects It also provides convenient facilities for synchronizing between the test thread and the threads being tested In AuctionSearchStressTests, we set up AuctionSearch with a thread-pool executor that will run tasks in background threads, and a list of auction houses stubbed to match on the given keywords jMock is not thread-safe by default, so we set up the Mockery with a Synchroniser, an implementation of its threading policy that allows us to call mocked objects from different threads To make tuning the test easier, we de ne constants at the top for the degree of stress we ll apply during the run
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@RunWith(JMockclass) public class AuctionSearchStressTests { private static final int NUMBER_OF_AUCTION_HOUSES = 4; private static final int NUMBER_OF_SEARCHES = 8; private static final Set<String> KEYWORDS = setOf("sheep", "cheese"); final Synchroniser synchroniser = new Synchroniser(); final Mockery context = new JUnit4Mockery() {{ setThreadingPolicy(synchroniser); }}; final AuctionSearchConsumer consumer = contextmock(AuctionSearchConsumerclass); final States searching = contextstates("searching"); final ExecutorService executor = ExecutorsnewCachedThreadPool(); final AuctionSearch search = new AuctionSearch(executor, auctionHouses(), consumer); [ ] private List<AuctionHouse> auctionHouses() { ArrayList<AuctionHouse> auctionHouses = new ArrayList<AuctionHouse>(); for (int i = 0; i < NUMBER_OF_AUCTION_HOUSES; i++) { auctionHousesadd(stubbedAuctionHouse(i)); } return auctionHouses; } private AuctionHouse stubbedAuctionHouse(final int id) { StubAuctionHouse house = new StubAuctionHouse("house" + id); housewillReturnSearchResults( KEYWORDS, asList(new AuctionDescription(house, "id" + id, "description"))); return house; }
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@Test(timeout=500) public void onlyOneAuctionSearchFinishedNotificationPerSearch() throws Exception { contextchecking(new Expectations() {{ ignoring (consumer)auctionSearchFound(with(anyResults())); }}); for (int i = 0; i < NUMBER_OF_SEARCHES; i++) { completeASearch(); } } private void completeASearch() throws InterruptedException { searchingstartsAs("in progress"); contextchecking(new Expectations() {{ exactly(1)of(consumer)auctionSearchFinished(); then(searchingis("done")); }}); searchsearch(KEYWORDS); synchroniserwaitUntil(searchingis("done")); } @After public void cleanUp() throws InterruptedException { executorshutdown(); executorawaitTermination(1, SECONDS); } }
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In the test method onlyOneAuctionSearchFinishedNotificationPerSearch(), we run a complete search NUMBER_OF_SEARCHES times, to increase the likelihood of nding any race conditions It nishes each search by asking synchroniser to wait until it s collected all the background threads the executor has launched, or until it s timed out Synchroniser provides a method that will safely wait until a state machine is (or is not) in a given state The test ignores auctionSearchFound() noti cations, since here we re only interested in making sure that the searches nish cleanly Finally, we shut down executor in the test teardown It s important to watch a stress test fail It s too easy to write a test that passes even though the tested object has a synchronization hole So, we test the test by making it fail before we ve synchronized the code, and checking that we get the failure report we expected If we don t, then we might need to raise the numbers of threads or iterations per thread until we can trust the test to reveal the error2 Then we add the synchronization to make the test pass Here s our test failure:
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2 Of course, the stress parameters may differ between environments, such as development vs build We can t follow that through here, except to note that it needs addressing
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javalangAssertionError: unexpected invocation: consumerauctionSearchFinished() expectations: allowed, already invoked 5 times: consumerauctionSearchFound(ANYTHING) expected once, already invoked 1 time: consumerauctionSearchFinished(); then searching is done expected once, already invoked 1 time: consumerauctionSearchFinished(); then searching is done states: searching is done what happened before this: consumerauctionSearchFound(<[AuctionDescription[auctionHouse=houseA,[ ] consumerauctionSearchFound(<[AuctionDescription[auctionHouse=houseB,[ ] consumerauctionSearchFound(<[AuctionDescription[auctionHouse=houseB,[ ] consumerauctionSearchFinished() consumerauctionSearchFound(<[AuctionDescription[auctionHouse=houseA,[ ] consumerauctionSearchFinished() consumerauctionSearchFound(<[AuctionDescription[auctionHouse=houseB,[ ]
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