Test adjustments and improvements.

[Tzrlk]

• Reducing code duplication
• Using import destructuring.
• Ignoring integration test file output.
• Changing package 'test' script to not use hashbang execution.
• Explicitly requiring jake rather than relying on global import
• Fixing integration tests to run on Windows.

[Tzrlk]

I'm aware this set of changes is less surgical than it could be, so if there's anything you'd like me to pull back on, please let me know.

I really wanted to be able to get the tests running properly in my windows environment before I started rewriting more things.

[Tzrlk]

I also note that the travis build specifies node 8, 10, and 12. These changes will definitely not pass those builds. I might look into improving the test runner to execute the jake cli against different nodejs versions, so compatibility with older runtimes can be maintained with transpiling and/or conditional shims.

[mde]

This looks amazing! However, I noticed a bunch of semicolon-less lines in your changeset, and reaalized the following:

• I never added a lint task in the Jakefile (it only existed in the package.json)
• ESLint's defaults seem to have shifted to allow semicolon-less style, so I needed to an explicit rule

I have fixed both of these issues. The conflicts in your PR are doubtless just collisions where eslint --fix added semis, and the one strange added comma in that long regex that you already identified.

I am not super concerned about the older versions of Node. Jake has been around since Node v2, and sometimes things in the codebase take a while to catch up to reality.

[Tzrlk]

I'm super happy I got a positive response to this; thanks a ton. Still have to do something with the build, but it's all clear locally now.

Do you have a preference for Travis? Or would Github actions do just as well? I'll throw some branches together with various changes to make things a bit easier.