Testing javascript
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This document introduces testing JavaScript code with Jasmine. It discusses that JavaScript should be tested like production code to allow changing, fixing, cleaning, and refactoring code without fear of breaking things. Tests should be fast, independent, repeatable, self-validating by passing or failing, and timely by writing tests before production code. An example is given of writing a failing test for a buggy random die rolling function, running the test to see it fail, fixing the bug, and adding more tests for documentation and confidence in changes.
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Testing javascript
- 1. Testing JavaScript with Jasmine
- 2. Why should we test JavaScript?
- 3. How many times have you changed something in JavaScript
- 4. Only to break something else?
- 5. JavaScript = Production Code!
- 6. Which means, we need to treat it with respect
- 7. And, preserve the ability to
- 8. change
- 9. fix
- 10. clean
- 11. and refactor our JavaScript code
- 12. Without fear of breaking something
- 13. Testing is especially important when external factors can affect how our code functions
- 14. What makes a good test?
- 15. Think F.I.R.S.T
- 16. Fast
- 17. Independent Tests should not depend on each other.
- 18. Repeatable Always the same results, regardless of environment.
- 19. Self-Validating Pass or Fail No manual evalutation.
- 20. Timely Write tests before production code.
- 21. Let’s look at an example. A random function for rolling a die.
- 23. How do we normally debug JavaScript?
- 24. Let’s forget we even mentioned that…
- 26. So… we have this buggy code.
- 27. What do we do about it?
- 28. Write a failing test
- 29. Then Run the test to see it fail
- 30. SpecRunner.html
- 31. Squash the bug
- 32. Success!
- 33. Add more tests
- 35. Remember…
- 36. When you find yourself wanting to do this.
- 37. Write a test instead!
- 38. Questions?