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@RunWith(JMockclass) 1 public class AuctionMessageTranslatorTest { private final Mockery context = new JUnit4Mockery(); 2 private final AuctionEventListener listener = contextmock(AuctionEventListenerclass); 3 private final AuctionMessageTranslator translator = new AuctionMessageTranslator(listener); 4 @Test public void notifiesAuctionClosedWhenCloseMessageReceived() { Message message = new Message(); messagesetBody("SOLVersion: 11; Event: CLOSE;"); 5 contextchecking(new Expectations() {{ 6 oneOf(listener)auctionClosed(); 7 }}); translatorprocessMessage(UNUSED_CHAT, message); 8 } 9 }
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The @RunWith(JMockclass) annotation tells JUnit to use the jMock test runner, which automatically calls the mockery at the end of the test to check that all mock objects have been invoked as expected The test creates the Mockery Since this is a JUnit 4 test, it creates a JUnit4Mockery which throws the right type of exception to report test failures to JUnit 4 By convention, jMock tests hold the mockery in a eld named context, because it represents the context of the object under test The test uses the mockery to create a mock AuctionEventListener that will stand in for a real listener implementation during this test The test instantiates the object under test, an AuctionMessageTranslator, passing the mock listener to its constructor The AuctionMessageTranslator does not distinguish between a real and a mock listener: It communicates through the AuctionEventListener interface and does not care how that interface is implemented The test sets up further objects that will be used in the test The test then tells the mockery how the translator should invoke its neighbors during the test by de ning a block of expectations The Java syntax we use to do this is obscure, so if you can bear with us for now we explain it in more detail in Appendix A This is the signi cant line in the test, its one expectation It says that, during the action, we expect the listener s auctionClosed() method to be called exactly once Our de nition of success is that the translator will notify its
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jMock2: Mock Objects listener that an auctionClosed() event has happened whenever it receives a raw Close message
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This is the call to the object under test, the outside event that triggers the behavior we want to test It passes a raw Close message to the translator which, the test says, should make the translator call auctionClosed() once on the listener The mockery will check that the mock objects are invoked as expected while the test runs and fail the test immediately if they are invoked unexpectedly Note that the test does not require any assertions This is quite common in mock object tests
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The example above speci es one very simple expectation jMock s expectation API is very expressive It lets you precisely specify: The minimum and maximum number of times an invocation is expected; Whether an invocation is expected (the test should fail if it is not received) or merely allowed to happen (the test should pass if it is not received); The parameter values, either given literally or constrained by Hamcrest matchers; The ordering constraints with respect to other expectations; and, What should happen when the method is invoked a value to return, an exception to throw, or any other behavior An expectation block is designed to stand out from the test code that surrounds it, making an obvious separation between the code that describes how neighboring objects should be invoked and the code that actually invokes objects and tests the results The code within an expectation block acts as a little declarative language that describes the expectations; we ll return to this idea in Building Up to Higher-Level Programming (page 65) There s more to the jMock API which we don t have space for in this chapter; we ll describe more of its features in examples in the rest of the book, and there s a summary in Appendix A What really matters, however, is not the implementation we happened to come up with, but its underlying concepts and motivations We will do our best to make them clear
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