Test file for Synthutils.js added

[justin212407]

Description:

This pull request addresses issue #4124 for including test files.

Changes Made:

The test file for synthutils.js has been added through this pull request. It addresses all the functions present in the synthutils.js file.

Screenshots:

Checklist:

• My changes adhere to the project's contribution guidelines.
• Code changes are implemented.
• The test written passes all the checks.

[justin212407]

@walterbender please review this as the babel.config.js will be needed to write some other tests too.

[walterbender]

I am seeing:
` FAIL js/utils/tests/synthutils.test.js
● Test suite failed to run

Cannot find module 'tone' from 'js/utils/__tests__/synthutils.test.js'

  4 | import Synth from '../synthutils';
  5 |
> 6 | jest.mock('tone', () => ({
    |      ^
  7 |   Transport: {
  8 |     start: jest.fn(),
  9 |     stop: jest.fn()

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

(node:505714) [DEP0040] DeprecationWarning: The punycode module is deprecated. Please use a userland alternative instead.
(Use node --trace-deprecation ... to show where the warning was created)
`

[justin212407]

@walterbender you need to install tone.js locally for it to run. That's probably why you are facing those errors as the synthutilsjs file uses tone.js for testing.

[justin212407]

Just checked it again by running the test locally, it runs successfully when i run it that way

[walterbender]

Isn't tone.js already installed as part of MB? Or does it need to be installed as an NPM package as well?

[justin212407]

@walterbender it needs to be installed as an NPM package using npm install tone.js