Unit tests for JavaScript

[mbollmann]

Originally reported by: Marcel Bollmann (Bitbucket: mbollmann, GitHub: mbollmann)

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Currently there are zero unit tests for the JavaScript components of the code, which is ... not good.

First priority is setting up some unit test framework and integrating it into the CMake build process. Most likely candidate is QUnit, since it supports unit tests involving the DOM, which most other frameworks do not. Performing unit tests automatically, instead of going through a web browser each time, will probably require node.js components in some way.

Possible alternatives:

• js-test-driver
• Mocha
  * Testing DOM JavaScript Functions with Mocha
  * JavaScript DOM in browser tests with Mocha & Chai
  * Testing JavaScript with PhantomJS (actually recommends Mocha for DOM-based tests)

Actually creating some unit tests will likely be a longer and more involved process, but it won't get done without laying the foundation first.

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• Bitbucket: https://bitbucket.org/mbollmann/cora/issue/34

[mbollmann]

Original comment by Marcel Bollmann (Bitbucket: mbollmann, GitHub: mbollmann):

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We could also include sth. like JSLint in CMake's lint target.

[mbollmann]

Basic support for JS unit testing has been introduced in #92. Tests of course still need to be actually written...