Add more tests and refactor to make code more testable about chartist HOT 7 CLOSED

Shall I put the tests under source/scripts named with a spec.js suffix? I really do not like creating test in a different folder.

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I also like to put test files into the folder where the component under test lives. However, for a library project with less components I don't see the same benefit as with an application where you might end up with 30+ components. Also it's still quite common to use a test folder and given possible future contributions with people who are more used to a test folder, I'd rather go with the current approach.

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It would be awesome if the project also contains everything required so we can run the tests on Travis!

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I'll start with the tests first :)

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And I think I'll integrate first istanbul so that I'll know what to test

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Cool, istanbul is awesome! :-)

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As we have now some code coverage I'll close this issue. There is still need for more tests but this is no longer a blocker for 1.0.0

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