This PR moves a unit test out of linter and into a separate mocha test file similar to utils.test.js. This unit test is still called by npm run test, since test script includes npm run mocha.

For reviewer convenience, I split it up into two commits: the actual change is in the first commit and the second commit is just npm run fix.

Running npm run test

Before:

$ npm run test

> @mdn/[email protected] test
> npm run mocha && npm run lint


> @mdn/[email protected] mocha
> mocha "test/**.test.js"



  utils
    √ `escapeInvisibles()` works correctly


  1 passing (3ms)


> @mdn/[email protected] lint
> node test/lint
> [rest of output]

After:

$ npm run test

> @mdn/[email protected] test /home/runner/work/browser-compat-data/browser-compat-data
> npm run mocha && npm run lint


> @mdn/[email protected] mocha /home/runner/work/browser-compat-data/browser-compat-data
> mocha "test/**.test.js"



  compare-features script
    ✓ `compareFeatures()` works correctly

  utils
    ✓ `escapeInvisibles()` works correctly


  2 passing (7ms)


> @mdn/[email protected] lint /home/runner/work/browser-compat-data/browser-compat-data
> node test/lint
> [rest of output]

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• Summarize your changes
• Data: link to resources that verify support information (such as browser's docs, changelogs, source control, bug trackers, and tests)
• Data: if you tested something, describe how you tested with details like browser and version
• Review the results of the linter and fix problems reported (If you need help, please ask in a comment!)
• Link to related issues or pull requests, if any