Unit testing

Talk about Unit Testing: Pet / Cin / Universidade Federal de Pernambuco.
https://www.facebook.com/events/372202459624692/

Cloning and running tests on senna https://asciinema.org/a/14458

Transcript

1. Unit testing Henrique Vicente
 henvic.github.io
3. Why • Legacy code = code without tests • Safety net = fewer defects • Test cases = free and up-to-date docs • Prove that your code works • Ensure changes don’t break a thing
4. Test-Driven Development • Programming technique • Part of Agile methodologies, including XP
5. Write failing test case Verify all tests pass Change code
7. Challenges • Lack of company culture • Legacy code • Code coverage • Experimenting • Dependencies • Data providers • Nondeterministic algorithms
8. Unit tests • Independent from each other • Runs damn fast (ms to seconds) • Essential if you decide to use TDD • Don’t test private methods, cover it indirectly
9. Mocks • Isolate dependencies by mocking • Dependency injection / inversion of control to the rescue!
10. Data provider • Mock your data • Unit tests shouldn’t talk with SQL databases, remote procedures, and so on.
11. www.mockaroo.com
12. Integration testing • Testing of your unit tests in conjunction • Testing several production code
13. Continuous Integration • Not to be confused with integration testing • Useful for integration testing • Let your developers know the status of your software builds
14. build status
20. Java HelloWorldTest
23. Run the unit test here!
29. It’ll ask you to accept license and, once installed, to restart Eclipse.
30. Run the coverage! http://www.eclemma.org/faq.html
31. Bad loop, but covered
32. Why are JUnit4 test cases with expected exceptions shown as not covered? http://www.eclemma.org/faq.html
33. KISS Keep ignoring. Refactor!
36. JUnit tests annotations • @Test • @Before • @After • @BeforeClass • @AfterClass • @Ignore
37. JUnit asserts • void assertEquals(boolean expected, boolean actual) • void assertTrue(boolean expected, boolean actual) • void assertFalse(boolean condition) • void assertNotNull(Object object) • void assertNull(Object object) • void assertSame(boolean condition) • void assertNotSame(boolean condition) • void assertArrayEquals(expectedArray, resultArray);
38. http://docs.travis-ci.com/user/languages/java/
39. https://github.com/mplacona/java-junit-template-project
40. JavaScript helloWorld() • Client? Server? • Mocha • Karma • many others
41. Continuous Integration • Travis • Jenkins • others
42. • pre-commit to abort commits without —no-verify • post-commit to give you an opportunity to —amend before pushing to a remote.
46. https://travis-ci.org/eduardolundgren/senna/builds/40133436
50. https://github.com/caolan/nodeunit
52. http://karma-runner.github.io/
54. https://asciinema.org/a/14458
55. • A Virtual Conference for Developers http://hacksummit.org/ • http://en.wikipedia.org/wiki/File:Wistar_rat.jpg • OMG PONIES!!! (AKA HUMANITY: EPIC FAIL)
 http://codeblog.jonskeet.uk/2009/11/02/omg-ponies-aka-humanity-epic-fail/ or Jon Skeet’s video at hack.summit • http://en.wikipedia.org/wiki/File:Test-driven_development.PNG • http://www.zyracuze.com/for-your-information/kiss-keep-it-simple-stupid/ • Watch Uncle Bob (Robert Martin) videos, read his Code Clean and Coder Clean books, and if you have to deal with legacy code, try Working Effectively with Legacy Code.