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

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

“ Desenvolvimento guiado por testes é um caminho de gerenciamento do medo durante a programação.”

Kent Beck - Test Driven

Development by Example

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

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

O ritmo em 3 A’s

Arrange [Criar um objeto]

Act [Invocar um método]

Assert [Verificar o resultado]

Refactoring Workbook, Bill Wake

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.

RED - GREEN - REFACTOR

Escreva um teste que não funciona.

Escreva o código e faço-o funcionar.

Refatore e elimine o código repetitivo.

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

Red Bar Patterns

One Step Test

Starter Test

Explanation Test

Learning Test

Another Test

Regression Test

Break

Do Over

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 );

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 );

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()); }

Red Bar Patterns

One Step Test

Starter Test

Explanation Test

Learning Test

Another Test

Regression Test

Break

Do Over

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());

Red Bar Patterns

One Step Test

Starter Test

Explanation Test

Learning Test

Another Test

Regression Test

Break

Do Over

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);

Red Bar Patterns

One Step Test

Starter Test

Explanation Test

Learning Test

Another Test

Regression Test

Break

Do Over

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 { … }

Red Bar Patterns

One Step Test

Starter Test

Explanation Test

Learning Test

Another Test

Regression Test

Break

Do Over

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);

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);

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()); } }

Red Bar Patterns

One Step Test

Starter Test

Explanation Test

Learning Test

Another Test

Regression Test

Break

Do Over

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

Red Bar Patterns

One Step Test

Starter Test

Explanation Test

Learning Test

Another Test

Regression Test

Break

Do Over

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

Green Bar Patterns

Fake It (‘till you make it)

Triangulate

Obvious Implementation

One to Many

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; } });}});

Green Bar Patterns

Fake It (Till you make it)

Triangulate

Obvious Implementation

One to Many

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 () { ..}

Green Bar Patterns

Fake It (Till you make it)

Triangulate

Obvious Implementation

One to Many

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);

Green Bar Patterns

Fake It (Till you make it)

Triangulate

Obvious Implementation

One to Many

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 );

Green Bar Patterns

Fake It (Till you make it)

Triangulate

Obvious Implementation

One to Many

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

Testing Patterns

Child Test

Mock Object

Self Shunt

Log String

Crash Test Dummy

Broken Test

Clean Check-In

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 { ... }

Testing Patterns

Child Test

Mock Object

Self Shunt

Log String

Crash Test Dummy

Broken Test

Clean Check-In

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; } }); }});

Testing Patterns

Child Test

Mock Object

Self Shunt

Log String

Crash Test Dummy

Broken Test

Clean Check-In

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 );

Testing Patterns

Child Test

Mock Object

Self Shunt

Log String

Crash Test Dummy

Broken Test

Clean Check-In

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

Testing Patterns

Child Test

Mock Object

Self Shunt

Log String

Crash Test Dummy

Broken Test

Clean Check-In

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() ); } }

Testing Patterns

Child Test

Mock Object

Self Shunt

Log String

Crash Test Dummy

Broken Test

Clean Check-In

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

Testing Patterns

Child Test

Mock Object

Self Shunt

Log String

Crash Test Dummy

Broken Test

Clean Check-In

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

Testing Patterns

Child Test

Mock Object

Self Shunt

Log String

Crash Test Dummy

Broken Test

Clean Check-In

Test Driven Development Test Double Dummy Fake Stubs Spies Mocks

Test Double

Dummy

Fake

Stubs

Spies

Mocks

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);

Test Double

Dummy

Fake

Stubs

Spies

Mocks

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>(); } }

Test Double

Dummy

Fake

Stubs

Spies

Mocks

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() );

Test Double

Dummy

Fake

Stubs

Spies

Mocks

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 );

Test Double

Dummy

Fake

Stubs

Spies

Mocks

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; } }); }});

Test Double

Dummy

Fake

Stubs

Spies

Mocks

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) { ... } }

Fixture Setup

Setup

Tear Down