Test Driven Development

Marcelo Cure

Where did it come from?

•Kent Beck in 2003•Concepts related to Extreme

Programming

What’s TDD?

•Development technique•Focus on quality•First test then code•Requirements before code•Based on cycles

How does TDD work?

•Developer must have the feature knowledge

•Think baby steps•Write a failing test•Make it pass•Make sure it didn’t break any other test•Refactor•Loop

Benefits

•More tests, less bugs•Code quality•Rare necessity to debug•Leads to modularize your system•Big coverage

Limitations

•Management support is required•Fake tests•Are we really doing TDD?

Environment (talking about Java)•Java•Eclipse•JUnit

Examples – NameRetriever

NameRetrieverTest

public class NameRetrieverTest {private NameRetriever nameRetriever;

@Testpublic void testRetrieveName() {String name =

nameRetriever.retrieveName();Assert.assertEquals("cure", name);}}

NameRetriever

public class NameRetriever {public String retrieveName() { return "";}}

NameRetriever

public class NameRetriever {public String retrieveName() { return "cure";}}

NameRetrieverTest

public class NameRetrieverTest {private NameRetriever nameRetriever;

@Testpublic void testRetrieveName () {Assert.assertEquals("cure",

nameRetriever.retrieveName());}}

That’s all, thanks!