README.md

Tests to verify Mocha's --extension behaviour

Verifies (Mocha issue 3808](mochajs/mocha#3808)

According to Mocha's own docs one should be able to specify which extensions mocha will automatically load.

Specifying --extension will remove .js as a test file extension; use --extension js to re-add it. For example, to load .mjs and .js test files, you must supply --extension mjs --extension js.

It quite clearly says that by specifying an extension, the default should be cleared. I have never seen this happen :-(

Output contradicting the docs

The test directory only contains a single file with the extension bar, so this means only one file should be loaded according to the docs. Instead, four files are loaded:

mocha --extension bar

This is not a test: no-test.js


  normal.bar
    ✓ should do nothing but register the test

  normal.bar.js
    ✓ should do nothing but register the test

  normal.js
    ✓ should do nothing but register the test