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Now we want to return to the end-to-end test and the reportsInvalidMessage() method that we parked Our requirement is that the Sniper application must log a message about these failures so that the user s organization can recover the situation This means that our test should look for a log le and check its contents
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We implement the missing check and ush the log before each test, delegating the management of the log le to an AuctionLogDriver class which uses the Apache Commons IO library It also cheats slightly by resetting the log manager (we re not really supposed to be in the same address space), since deleting the log le can confuse a cached logger
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public class ApplicationRunner { [ ] private AuctionLogDriver logDriver = new AuctionLogDriver(); public void reportsInvalidMessage(FakeAuctionServer auction, String message) throws IOException { logDriverhasEntry(containsString(message)); } public void startBiddingWithStopPrice(FakeAuctionServer auction, int stopPrice) { startSniper(); openBiddingFor(auction, stopPrice); } private startSniper() { logDriverclearLog() Thread thread = new Thread("Test Application") { @Override public void run() { // Start the application [ ] } } public class AuctionLogDriver { public static final String LOG_FILE_NAME = "auction-sniperlog"; private final File logFile = new File(LOG_FILE_NAME); public void hasEntry(Matcher<String> matcher) throws IOException assertThat(FileUtilsreadFileToString(logFile), matcher); } public void clearLog() { logFiledelete(); LogManagergetLogManager()reset(); } } {
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This new check only reassures us that we ve fed a message through the system and into some kind of log record it tells us that the pieces t together We ll write a more thorough test of the contents of a log record later The end-to-end test now fails because, of course, there s no log le to read
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Once again, the rst change is in the AuctionMessageTranslator We d like the record to include the auction identi er, the received message, and the thrown exception The single responsibility principle suggests that the AuctionMessageTranslator should not be responsible for deciding how to report the event, so we invent a new collaborator to handle this task We call it XMPPFailureReporter:
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public interface XMPPFailureReporter { void cannotTranslateMessage(String auctionId, String failedMessage, Exception exception); }
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We amend our existing failure tests, wrapping up message creation and common expectations in helper methods, for example:
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@Test public void notifiesAuctionFailedWhenBadMessageReceived() { String badMessage = "a bad message"; expectFailureWithMessage(badMessage); translatorprocessMessage(UNUSED_CHAT, message(badMessage)); } private Message message(String body) { Message message = new Message(); messagesetBody(body); return message; } private void expectFailureWithMessage(final String badMessage) { contextchecking(new Expectations() {{ oneOf(listener)auctionFailed(); oneOf(failureReporter)cannotTranslateMessage( with(SNIPER_ID), with(badMessage), with(any(Exceptionclass))); }}); }
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The new reporter is a dependency for the translator, so we feed it in through the constructor and call it just before notifying any listeners We know that messagegetBody() will not throw an exception, it s just a simple bean, so we can leave it outside the catch block
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public class AuctionMessageTranslator implements MessageListener { public void processMessage(Chat chat, Message message) { String messageBody = messagegetBody(); try { translate(messageBody); } catch (RuntimeException exception) { failureReportercannotTranslateMessage(sniperId, messageBody, exception); listenerauctionFailed(); } } [ ]
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Recording the Failure
Generating the Log Message
The next stage is to implement the XMPPFailureReporter with something that generates a log le This is where we actually check the format and contents of a log entry We start a class LoggingXMPPFailureReporter and decide to use Java s built-in logging framework We could make the tests for this new class write and read from a real le Instead, we decide that le access is suf ciently covered by the end-to-end test we ve just set up, so we ll run everything in memory to reduce the test s dependencies We re con dent we can take this shortcut, because the example is so simple; for more complex behavior we would write some integration tests The Java logging framework has no interfaces, so we have to be more concrete than we d like Exceptionally, we decide to use a class-based mock to override the relevant method in Logger; in jMock we turn on class-based mocking with the setImposteriser() call The AfterClass annotation tells JUnit to call resetLogging() after all the tests have run to ush any changes we might have made to the logging environment
@RunWith(JMockclass) public class LoggingXMPPFailureReporterTest { private final Mockery context = new Mockery() {{ setImposteriser(ClassImposteriserINSTANCE); }}; final Logger logger = contextmock(Loggerclass); final LoggingXMPPFailureReporter reporter = new LoggingXMPPFailureReporter(logger); @AfterClass public static void resetLogging() { LogManagergetLogManager()reset(); } @Test public void writesMessageTranslationFailureToLog() { contextchecking(new Expectations() {{ oneOf(logger)severe("<auction id> " + "Could not translate message \"bad message\" " + "because \"javalangException: bad\""); }}); reportercannotTranslateMessage("auction id", "bad message", new Exception("bad")); } }
We pass this test with an implementation that just calls the logger with a string formatted from the inputs to cannotTranslateMessage()