Consolidation in Java

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Consolidation
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Through our experience in Connextra and other companies, and through giving many presentations, we improved our understanding and communication of the ideas of mock objects Steve (inspired by some of the early lean software material) coined the term needs-driven development, and Joe Walnes, another colleague, drew a nice visualisation of islands of objects communicating with each other Joe also had the insight of using mock objects to drive the design of interfaces between objects At the time, we were struggling to promote the idea of using mock objects as a design tool; many people (including some authors) saw it only as a technique for speeding up unit tests Joe cut through all the conceptual barriers with his simple heuristic of Only mock types you own
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7 Later, Steve talked Charlie Poole into including constraints in NUnit It took some extra years to have matchers (the latest version of constraints) adopted by JUnit
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Consolidation We took all these ideas and wrote a second conference paper, Mock Roles not Objects [Freeman04] Our initial description had focused too much on implementation, whereas the critical idea was that the technique emphasizes the roles that objects play for each other When developers are using mock objects well, I observe them drawing diagrams of what they want to test, or using CRC cards to roleplay relationships these then translate nicely into mock objects and tests that drive the required code Since then, Nat and Steve have reworked jMock to produce jMock2, and Joe has extracted constraints into the Hamcrest library (now adopted by JUnit) There s also now a wide selection of mock object libraries, in many different languages The results have been worth the effort I think we can nally say that there is now a well-documented and polished technique that helps you write better software From those humble no getters beginnings, this book summarizes years of experience from all of us who have collaborated, and adds Steve and Nat s language expertise and careful attention to detail to produce something that is greater than the sum of its parts
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Appendix A
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jMock2 Cheat Sheet
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Introduction
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We use jMock2 as our mock object framework throughout this book This chapter summarizes its features and shows some examples of how to use them We re using JUnit 46 (we assume you re familiar with it); jMock also supports JUnit3 Full documentation is available at wwwjmockorg We ll show the structure of a jMock unit test and describe what its features do Here s a whole example:
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import import import import orgjmockExpectations; orgjmockMockery; orgjmockintegrationjunit4JMock; orgjmockintegrationjunit4JUnit4Mockery;
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@RunWith(JMockclass) public class TurtleDriverTest { private final Mockery context = new JUnit4Mockery(); private final Turtle turtle = contextmock(Turtleclass); @Test public void goesAMinimumDistance() { final Turtle turtle2 = contextmock(Turtleclass, "turtle2"); final TurtleDriver driver = new TurtleDriver(turtle1, turtle2); // set up contextchecking(new Expectations() {{ // expectations ignoring (turtle2); allowing (turtle)flashLEDs(); oneOf (turtle)turn(45); oneOf (turtle)forward(with(greaterThan(20))); atLeast(1)of (turtle)stop(); }}); drivergoNext(45); // call the code assertTrue("driver has moved", driverhasMoved()); // further assertions } }
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Appendix A
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Test Fixture Class
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First, we set up the test xture class by creating its Mockery
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import import import import orgjmockExpectations; orgjmockMockery; orgjmockintegrationjunit4JMock; orgjmockintegrationjunit4JUnit4Mockery;
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@RunWith(JMockclass) public class TurtleDriverTest { private final Mockery context = new JUnit4Mockery(); [ ] }
For the object under test, a Mockery represents its context the neighboring objects it will communicate with The test will tell the mockery to create mock objects, to set expectations on the mock objects, and to check at the end of the test that those expectations have been met By convention, the mockery is stored in an instance variable named context A test written with JUnit4 does not need to extend a speci c base class but must specify that it uses jMock with the @RunWith(JMockclass) attribute1 This tells the JUnit runner to nd a Mockery eld in the test class and to assert (at the right time in the test lifecycle) that its expectations have been met This requires that there should be exactly one mockery eld in the test class The class JUnit4Mockery will report expectation failures as JUnit4 test failures