Test Driven Development (TDD) is a software development process that relies on the repetition of a very short development cycle: requirements are turned into very specific test cases that are failed, then code is written to pass the tests, and finally the new code is refactored if needed. This process allows software to be developed incrementally while facilitating change by providing continuous feedback. The document provides details on TDD patterns and processes like red-green-refactor cycles and using test doubles.

1. Test Driven Development [TDD] Christiano Milfont #XPCE 2009, Fortaleza Copyleft 2009 Milfont.org Desenvolvimento guiado a testes

2. Test Driven Development “ Desenvolvimento guiado por testes é um caminho de gerenciamento do medo durante a programação.” Kent Beck - Test Driven Development by Example

3. Test Driven Development Standup Meeting @ 9h Pair Up Test First [Prática] Code Refactor Integrar ou Disponibilizar Ir para casa @ 17h

4. Test Driven Development O ritmo em 3 A’s Arrange [Criar um objeto] Act [Invocar um método] Assert [Verificar o resultado] Refactoring Workbook, Bill Wake

5. Test Driven Development RED - GREEN - REFACTOR Escreva um teste que não funciona. Escreva o código e faço-o funcionar. Refatore e elimine o código repetitivo.

6. Test Driven Development Red Bar Patterns One Step Test Starter Test Explanation Test Learning Test Another Test Regression Test Break Do Over

7. Test Driven Development Red Bar Patterns One Step Test Starter Test Explanation Test Learning Test Another Test Regression Test Break Do Over Issue issue = member . createIssue (name) .withType( type ) .withLevel( level ) .withSummary( summary ) .toProject( project );

8. Test Driven Development Red Bar Patterns One Step Test Starter Test Explanation Test Learning Test Another Test Regression Test Break Do Over @Test public void createIssueFromMember() throws IllegalArgumentIssueException { member = new Member(); issue = member . createIssue ("Issue created"); Assert.assertNotNull( ISSUE_IN_NULL, issue); Assert.assertEquals( "State is not unconfirmed", Status.UNCONFIRMED, issue.getStatus()); }

9. Test Driven Development Red Bar Patterns One Step Test Starter Test Explanation Test Learning Test Another Test Regression Test Break Do Over issue = new Member() . createIssue ("Issue created"); Assert. assertNotNull ( ISSUE_IN_NULL, issue); Assert. assertEquals ( "State is not unconfirmed", Status.UNCONFIRMED, issue.getStatus());

10. Test Driven Development Red Bar Patterns One Step Test Starter Test Explanation Test Learning Test Another Test Regression Test Break Do Over type = new Type(){{ this.setId(Long.valueOf(10)); this.setName(BUG); }}; member = new Member().withType(type); issue = member.getIssueInProgress(); Assert. assertNotNull (ISSUE_IN_NULL, issue); Assert. assertNotNull ("Type is null", issue.getType()); Assert. assertTrue ("Type is not BUG", issue.getType().getId() == type.getId()); Assert. assertTrue ("Type is not BUG", issue.getType().getName() == type.getName()); Assert. assertEquals ("Type is not BUG", issue.getType().getName(), BUG);

11. Test Driven Development Red Bar Patterns One Step Test Starter Test Explanation Test Learning Test Another Test Regression Test Break Do Over @Test public void createIssueFromMemberWithNameEmpty () { ... } @Test public void setTypeInIssueFromMember () throws IllegalArgumentIssueException { … }

12. Test Driven Development Red Bar Patterns One Step Test Starter Test Explanation Test Learning Test Another Test Regression Test Break Do Over Issue issue = member .createIssue(name) .withType( type ) .withLevel( level ) .withSummary( summary ) .toProject( project ); Assert.assertNotNull( "Issue não gerada com sucesso!", issue); Assert.assertTrue( "Issue não gerada e id não atribuído", issue.getId() > 0);

13. Test Driven Development Red Bar Patterns One Step Test Starter Test Explanation Test Learning Test Another Test Regression Test Break Do Over @Test public void createIssueFromMemberWithNameNull() { try { issue = new Member() .createIssue( null ); Assert.fail( "Didn't find expected exception of type " + IllegalArgumentIssueException.class.getName()); } catch (IllegalArgumentIssueException e) { Assert.assertEquals("Exception correctly catch", "Name is null or empty“, e.getMessage()); } }

14. Test Driven Development Red Bar Patterns One Step Test Starter Test Explanation Test Learning Test Another Test Regression Test Break Do Over

15. Test Driven Development Green Bar Patterns Fake It (‘till you make it) Triangulate Obvious Implementation One to Many

16. Test Driven Development Green Bar Patterns Fake It (Till you make it) Triangulate Obvious Implementation One to Many context.checking(new Expectations() {{ oneOf (repository).persist(with(any(Issue.class))); will (new CustomAction("Add id value to issue") { public Object invoke (Invocation invocation) throws Throwable { ( (Issue) invocation.getParameter(0)). setId(Long.valueOf(1)); return null; } });}});

17. Test Driven Development Green Bar Patterns Fake It (Till you make it) Triangulate Obvious Implementation One to Many @Test public void setNullSummaryInIssueFromMember () {...} @Test public void setSummaryInIssueFromMember () {...} @Test public void setEmptySummaryInIssueFromMember () { ..}

18. Test Driven Development Green Bar Patterns Fake It (Till you make it) Triangulate Obvious Implementation One to Many ... List<Issue> issues = new ArrayList<Issue>() { { this.add( new Issue(Long.valueOf(134)) ); } }... Assert.assertTrue(“blable”, issues.size()==1);

19. Test Driven Development Green Bar Patterns Fake It (Till you make it) Triangulate Obvious Implementation One to Many ... List<Issue> issues = new ArrayList<Issue>() { { this.add( new Issue(Long.valueOf(134)) ); } }... Assert.assertTrue(“blable”, issues.size()==1 );

20. Test Driven Development Testing Patterns Child Test Mock Object Self Shunt Log String Crash Test Dummy Broken Test Clean Check-In

21. Test Driven Development Testing Patterns Child Test Mock Object Self Shunt Log String Crash Test Dummy Broken Test Clean Check-In @RunWith(JMock.class) public class LifeCycleOfIssueInProjectTest { ... } @RunWith(JMock.class) public class ReportIssuesTest { ... }

22. Test Driven Development Testing Patterns Child Test Mock Object Self Shunt Log String Crash Test Dummy Broken Test Clean Check-In context.checking(new Expectations() {{ oneOf (repository).persist(with(any(Issue.class))); will (new CustomAction(&quot;Add id value to issue&quot;) { public Object invoke (Invocation invocation) throws Throwable { ( (Issue) invocation.getParameter(0)). setId(Long.valueOf(1)); return null; } }); }});

23. Test Driven Development Testing Patterns Child Test Mock Object Self Shunt Log String Crash Test Dummy Broken Test Clean Check-In context.checking(new Expectations() {{ oneOf (repository).persist(with(any(Issue.class))); will (new CustomAction(&quot;Add id value to issue&quot;) { public Object invoke (Invocation invocation) throws Throwable { ( (Issue) invocation.getParameter(0)). setId(Long.valueOf(1)); repository.issues.add( ( (Issue) invocation.getParameter(0))); return null; } }); }}); ... Assert.assertTrue( repository.size() == 12 );

24. Test Driven Development Testing Patterns Child Test Mock Object Self Shunt Log String Crash Test Dummy Broken Test Clean Check-In

25. Test Driven Development Testing Patterns Child Test Mock Object Self Shunt Log String Crash Test Dummy Broken Test Clean Check-In @Test public void createIssueFromMemberWithNameNull() { try { issue = new Member() .createIssue( null ); Assert. fail ( &quot;Didn't find expected exception of type &quot; + IllegalArgumentIssueException.class.getName()); } catch ( IllegalArgumentIssueException e) { Assert.assertEquals(&quot; Exception correctly catch &quot;, &quot; Name is null or empty “, e.getMessage() ); } }

26. Test Driven Development Testing Patterns Child Test Mock Object Self Shunt Log String Crash Test Dummy Broken Test Clean Check-In

27. Test Driven Development Testing Patterns Child Test Mock Object Self Shunt Log String Crash Test Dummy Broken Test Clean Check-In

28. Test Driven Development Test Double Dummy Fake Stubs Spies Mocks

29. Test Driven Development Test Double Dummy Fake Stubs Spies Mocks ... List<Issue> issues = new ArrayList<Issue>() { { this.add( new Issue(Long.valueOf(134)) ); } }... Assert.assertTrue(“blable”, issues.size()==1);

30. Test Driven Development Test Double Dummy Fake Stubs Spies Mocks ... IssueRepository repository = new FakeRepository(); List<Issue> issuesUnconfirmeds = repository. getIssuesUnconfirmeds(); Assert.assertTrue(“blable”, issuesUnconfirmeds != null); ... public class FakeRepository implements IssueRepository { public List<Issue> getIssuesUnconfirmeds() { return new ArrayList<Issue>(); } }

31. Test Driven Development Test Double Dummy Fake Stubs Spies Mocks context.checking(new Expectations() {{ ignoring (repository).count(); will ( returnValue(42)); }}); ... Assert.assertEquals( 12 , repository.count() );

32. Test Driven Development Test Double Dummy Fake Stubs Spies Mocks context.checking(new Expectations() {{ oneOf (repository).persist(with(any(Issue.class))); will (new CustomAction(&quot;Add id value to issue&quot;) { public Object invoke (Invocation invocation) throws Throwable { ( (Issue) invocation.getParameter(0)). setId(Long.valueOf(1)); repository.issues.add( ( (Issue) invocation.getParameter(0))); return null; } }); }}); ... Assert.assertTrue( repository.size() == 12 );

33. Test Driven Development Test Double Dummy Fake Stubs Spies Mocks context.checking(new Expectations() {{ oneOf (repository).persist(with(any(Issue.class))); will (new CustomAction(&quot;Add id value to issue&quot;) { public Object invoke (Invocation invocation) throws Throwable { ( (Issue) invocation.getParameter(0)). setId(Long.valueOf(1)); return null; } }); }});

34. Test Driven Development Fixture Setup Setup Tear Down @Before public void setUp() throws Exception { Connection conn; try { ... IDatabaseConnection connection = new DatabaseConnection(conn); DatabaseOperation.INSERT.execute(connection, new FlatXmlDataSet( new FileInputStream( “ issuetrackr.xml&quot;))); conn.close(); } catch (Exception exc) { ... } }