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Testing With Meteor, CoffeeScript and Mocha

Adding unit tests is straightforward in Meteor. Any files in the tests/ folder will be ignored by the Meteor server.

What you’ll need:

Optional: Growl (for notifications from mocha watch)

Getting everything running:

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meteor create mocha
cd mocha
meteor add coffeescript

Setting up Mocha to watch our coffee files and send Growl notifications:

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mocha tests/*.coffee -w -G --compilers coffee:coffee-script

Now to create a sample test:

test.coffee
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describe "Array", ->
  describe "#indexOf()", ->
    it "should return -1 when the value is not present", ->
      assert.equal -1, [1, 2, 3].indexOf(1)
      assert.equal -1, [1, 2, 3].indexOf(0)

Mocha should notice the file change and run the tests showing you the passing test.

Source code here.

Some notes: - The growl notification didn’t work for me, but I assume that’s because I’m using an old version. - When using Mocha watch, sometimes a failing test result would be outputted many times - Jasmine¬†should also work fine

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