Unit Testing: What? Why? How?

Transcript

1. Unit Testing: What? Why? How?

2. John Blackbourn WordPress core developer Working with WordPress for 10+

   years Senior Engineer at Human Made @johnbillion

3. Unit Testing: What? Why? How?

4. You’re Going to L VE Unit Testing

5. That’s Enough of That

6. Unit Testing: What? Why? How?

7. A unit test is a piece of code which exists

   only to verify expectations about the behaviour of another piece of code Verification

8. a.k.a. “Does my function do what I expect it to

   do?”

9. A unit test operates in isolation in order to avoid

   external interference Isolated

10. Tests typically run on the command line CLI

11. Tests are highly efficient because they're quickly repeatable Automated

12. Crossing your fingers and hoping… is not a unit test

13. Unit Testing: What? Why? How?

14. A unit test can cover many scenarios and never misses

    anything Accuracy

15. Unit tests give you increased assurance that changes are less

    likely to cause breakage Assurance

16. Unit tests give you confidence to make changes Confidence

17. Unit tests help you write better code Smaller functions Separation

    of concerns Quality

18. Unit tests can be liberating Clarity

19. Unit Testing: What? Why? How?

20. None
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24. “But I know that false isn’t true”

25. None

26. Arrange Act Assert AAA

27. Each time a WordPress test runs, it operates on a

    fresh installation Remember
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32. Accuracy Assurance Confidence Quality?… The Result

33. Assertions assertTrue( $actual ) assertFalse( $actual ) assertEquals( $expected, $actual

    ) assertCount( $expected, $actual ) assertObjectHasAttribute( $key, $actual ) assertArrayHasKey( $key, $actual ) assertWPError( $actual ) assertCanonical( $actual, $expected )

34. a.k.a. A Real World Gotcha Type Juggling Kills Me

35. None
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37. WUT

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39. Provide Verification Isolated Automated Recap

40. Accuracy Assurance Confidence Quality Recap

41. Arrange Act Assert Recap

42. I Hope You’ll Fall In L VE With Testing

43. Read the WordPress Unit Tests Visit PHPUnit website for reference

    Check out WP-CLI scaffolding What Next?

44. John Blackbourn @johnbillion