Advanced TDD

If you love TDD and want to improve in this programming discipline, you're in the right place. Attend this talk, and you'll learn about:

- What TDD really is
- Techniques for making your test suite more reliable
- What does getting stuck mean, and how to get out of it
- Why mocking is more about collaboration
- Acceptance tests and more!

Transcript

1. ADVANCED TDD Diego Aguiar Beltrán @MolloKhan
2. ➢ Developer at SymfonyCasts ➢ Hiking ➢ Gaming (Warcraft FTW!) ➢ Tepic, Mexico Diego Aguiar Beltrán @MolloKhan
3. Main Topics ➢ What TDD Really is ➢ Useful TDD Techniques ➢ What “Getting Stuck” means ➢ When Not to TDD
4. What is TDD? ➢ Programming Methodology ➢ It’s Composed of 3 Laws ➢ Tests Always Go First ➢ Red, Green, Refactor cycle
5. TDD is more like a discipline
6. ➢ Practice, practice, practice… ➢ Train Your Mind ➢ Tests Go First
7. A bit of History… ➢ Kent Beck inventor of TDD ➢ Invented In the late 1990’s ➢ As a way to write better quality code
8. TDD Techniques ➢ Fake it till you make it ➢ Triangulation ➢ Assert First
9. Fake it till you make it
10. Name Inverter Example “Diego Aguiar” → “Aguiar, Diego” Fake it till you make it
11. Where to start? Fake it till you make it
12. Fake it till you make it public function testNullCase() { $name = null; $invertedName = $this->nameInverter ->invert($name); self::assertEquals('', $invertedName); } public function invert($name) { // Forcing test to pass return ‘’; } TEST CODE PRODUCTION
13. public function invert($name) { return 'Diego'; } PRODUCTION Fake it till you make it public function testSingleName() { $name = 'Diego'; $invertedName = $this->nameInverter ->invert($name); self::assertEquals( 'Diego', $invertedName ); } TEST CODE
14. Fake it till you make it PRODUCTION public function invert($name) { if (!$name) { return ''; } return $name; }
15. Triangulation
16. Triangulation class NameInverterTest extends TestCase { public function testNullCase() { $invertedName = $this->nameInverter->invert(null); self::assertEquals('', $invertedName); } public function testSingleName() { $invertedName = $this->nameInverter->invert('Diego'); self::assertEquals('Diego', $invertedName); } }
17. Fake it till you make it & Triangulation The Best of Friends
18. Assert First
19. Assert First class NameInverterTest extends TestCase { public function testFullName() { $name = 'Diego Aguiar'; $invertedName = $this->nameInverter ->invert($name); self::assertEquals('Aguiar, Diego', $invertedName); } }
20. Getting Stuck
21. Why does it happen? ➢ It’s a symptom of a problem ➢ Production code is too specific ➢ You wrote the wrong test ➢ Aiming for the goal too fast
22. How to get Unstuck ➢ Step up and think for a simpler test ➢ Refactor hard-to-test code ➢ Write a list of use-cases ➢ Ignore testing for a moment
23. When Not to TDD ➢ Configuration ➢ Discovering ➢ Repository Queries
24. ➢ TDD is more like a discipline ➢ There are techniques to get you unstuck ➢ TDD is a tool, not a rule Conclusion @MolloKhan
25. Happy TDD! @MolloKhan “One test a day keeps bugs away"
26. Z zero (or empty case) O one M many B boundaries I interfaces E exceptions BONUS!! https://i.ytimg.com/vi/0xRCYmbvfEs/maxresdefault.jpg
27. Happy TDD! @MolloKhan THANK YOU AGAIN!