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JavaScript Unit Testing

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Making Tests Easier with Fixtures: Teardown

3:39 with Guil Hernandez and Joseph Fraley

When we set something up before our tests, we need to be sure we tear it down afterward too. In this video, we’ll use Mocha functions called 'after' and 'afterEach'.

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Video review

  • Mocha provides a "teardown" phase to remove unwanted variables
  • If your tests change your development environment, like creating a pretend database, or start up a local server, you can use the teardown block to set your system back to where it started
  • Mocha's after() and afterEach() hooks work exactly like before() and beforeEach(), expect that they happen after
  • If you find yourself depending heavily on the teardown phase, you should double-check that you’re testing the right kind of function

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    other tests that run later. 0:00
    That's why mocha provides a tear down phase, to remove unwanted variables. 0:00
    In addition, if your test changed your development environment, 0:06
    like creating a pretend database. 0:09
    Or start up a local server, 0:11
    you can use the tear down block to set your system back to where it started. 0:13
    You'll need tear downs more often when your tests need a pretend database, or 0:19
    they interact with the DOM somehow. 0:23
    For example, you might be testing a function that sets up a new remote 0:25
    database, creates a local file or starts a server instance. 0:29

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