test suite for js/midi

[Commanderk3]

@walterbender I have made tests for midi file. I brought getClosestStandardNoteValue to midi.js as it is solely used by it. This will improve maintenance and make it easier to write test cases.
Please review this PR.

[github-actions]

✅ All Jest tests passed! This PR is ready to merge.

[github-actions]

✅ All Jest tests passed! This PR is ready to merge.

[Commanderk3]

Also in the previous PR for midi I forgot to correct the MAX_NOTEBLOCKS constant back to 100.

[walterbender]

Hmm. I am seeing an error now with the midi section of the Save interface test.

FAIL js/tests/SaveInterface.test.js
● Test suite failed to run

Cannot find module '@tonejs/midi' from 'js/__tests__/SaveInterface.test.js'

  1 | const { Midi } = require('@tonejs/midi');
  2 | // Mocking the @tonejs/midi library
> 3 | jest.mock('@tonejs/midi', () => {
    |      ^
  4 |     return {
  5 |         Midi: jest.fn().mockImplementation(() => ({
  6 |             header: { ticksPerBeat: 480 },

  at Resolver._throwModNotFoundError (node_modules/jest-resolve/build/resolver.js:427:11)
  at Object.mock (js/__tests__/SaveInterface.test.js:3:6)

[Commanderk3]

@walterbender Sir, you may have to install this module. You can do an npm i or npm i @tones/midi

That's why I think tests are passing in GitHub Actions

[github-actions]

✅ All Jest tests passed! This PR is ready to merge.

[Commanderk3]

Importing the library itself is not a good idea. This should help.

Thank you for pointing it out.

[walterbender]

OK. It should already be installed on the master branch.