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Testing javascript
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Testing javascript

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    Testing javascript Testing javascript Presentation Transcript

    • Testing JavaScript with Jasmine
    • Why should we test JavaScript?
    • How many times have youchanged something in JavaScript
    • Only to break something else?
    • JavaScript = Production Code!
    • Which means, we need to treat it with respect
    • And, preserve the ability to
    • change
    • fix
    • clean
    • and refactor our JavaScript code
    • Without fear of breaking something
    • Testing is especially important when external factors can affect how our code functions
    • What makes a good test?
    • Think F.I.R.S.T
    • Fast
    • IndependentTests should not depend on each other.
    • RepeatableAlways the same results, regardless of environment.
    • Self-Validating Pass or FailNo manual evalutation.
    • TimelyWrite tests before production code.
    • Let’s look at an example.A random function for rolling a die.
    • What’s wrong here?
    • How do we normally debug JavaScript?
    • Let’s forget we even mentioned that…
    • So… we have this buggy code.
    • What do we do about it?
    • Write a failing test
    • Then Run the test to see it fail
    • SpecRunner.html
    • Squash the bug
    • Success!
    • Add more tests
    • Win!Testing = Documentation!
    • Remember…
    • When you find yourself wanting to do this.
    • Write a test instead!
    • Questions?