Tests: Suggestion, Add npm run test-unit-examples command

[takahirox]

Related issue: #20795 (comment)

Background

Currently the examples unit tests are run only on http://localhost:8080/test/unit/UnitTests.html and there are no npm command to run them on Node.js.

Suggestion

I'd like to suggest to add a npm command to run the examples unit tests because it would be helpful for the quick tests.

Changes

• Add npm run test-unit-examples command to package.json
• Add npm run unit-examples command to test/package.json
• Move some test cases in GLTFLoader/Exporter which don't run on Node.js to -webonly (See Tests: Suggestion, Introduce -webonly keyword to QUnit.module name for skipping the tests on Node.js #20884)

I haven't let the root npm run test command invoke npm run test-unit-examples yet because I'm on the fence about it.

Screenshot

It shows npm run test-unit-examples works. As you see the examples unit tests cause console warnings similar to #20760. I hope we can remove them in another PR.

This contribution is made at a hotel where I stay for quarantines.

[Mugen87]

This contribution is made at a hotel where I stay for quarantines.

Hope you stay safe!

[mrdoob]

Thanks!