run `karma:dev` on `grunt watch` again

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re-add /test/lib/helpers.js to karma test suite

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This commit was sponsored by Human JavaScript.
Human JavaScript is the best way to learn modern
web application development today, read it now:

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replace expect(sth.calledWith(args)).to.be.ok() with expect(sth).to.be.calledWith(args)

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This commit was sponsored by Human JavaScript.
Human JavaScript is the best way to learn modern
web application development today, read it now:

http://go.hood.ie/human-javascript