Compat: Make tests work on Windows with non-English locale

[woutervanvliet]

Why am I submitting this PR

I originally started investigating the Broccoli problems mentioned in #684 on a Windows computer, running with some Danish locale settings. This caused a number of problems, from my editor opening bin/cli.js instead of running the code to sorting and line-ending issues with some tests.

Assuming the assertions to be the one source of truth, I've added a locale parameter in localeCompare for the default comparison function. lineEndings are set to lf for a test that checks the entire contents of a generated JSON file.

Does it fix an existing ticket?

No

Checklist

• [X] only relevant code is changed (make a diff before you submit the PR)
• [X] tests are included and pass: yarn test (see details here)
• [X] documentation is changed or added

[codecov-commenter]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Files	Coverage Δ
src/helpers.js	92.39% <100.00%> (ø)

... and 1 file with indirect coverage changes

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