Test Driven Development

Test Driven Development [TDD]

Christiano Milfont#XPCE 2009, FortalezaCopyleft 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

Test Driven DevelopmentStandup Meeting @ 9h

Pair Up

Test First [Prática]

Code Refactor

Integrar ou Disponibilizar

Ir para casa @ 17h


O ritmo em 3 A’s• Arrange [Criar um objeto]• Act [Invocar um método]• Assert [Verificar o resultado]

Refactoring Workbook, Bill Wake


RED-GREEN-REFACTOR1.Escreva um teste que não funciona.2.Escreva o código e faço-o funcionar.3.Refatore e elimine o código repetitivo.


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);



@Testpublic 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());

}



issue = new Member()

.createIssue("Issue created");Assert.assertNotNull(

ISSUE_IN_NULL, issue);Assert.assertEquals(

"State is not unconfirmed",

Status.UNCONFIRMED, issue.getStatus());



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);



@Testpublic void

createIssueFromMemberWithNameEmpty() {...}

@Test

public void setTypeInIssueFromMember() throws IllegalArgumentIssueException {

…}



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);



@Testpublic 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());}

}


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 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

@Testpublic 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 ...

List<Issue> issues = new ArrayList<Issue>() {{

this.add(new Issue(Long.valueOf(134)));}

}...Assert.assertTrue(“blable”, issues.size()==1);


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 { ... }



context.checking(new Expectations() {{oneOf(repository).persist(with(any(Issue.class)));will(new CustomAction("Add id value to issue") {



return null;}

});}});






repository.issues.add(

( (Issue) invocation.getParameter(0)));

return null;}

});}});...Assert.assertTrue(repository.size() == 12);



@Testpublic 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());}

}


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);



...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>();}

}



context.checking(new Expectations() {{ignoring(repository).count();will(returnValue(42));

}});...Assert.assertEquals(12 , repository.count());






repository.issues.add(

( (Issue) invocation.getParameter(0)));

return null;}

});}});...Assert.assertTrue(repository.size() == 12);






return null;}

});}});


Fixture Setup• Setup• Tear Down

@Beforepublic void setUp() throws Exception {

Connection conn;try {

... IDatabaseConnection connection =

new DatabaseConnection(conn); DatabaseOperation.INSERT.execute(connection,

new FlatXmlDataSet(new FileInputStream( “issuetrackr.xml")));

conn.close();} catch (Exception exc) { ... }

}

Test Driven Development

Technology

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