Meta: Docs and Tests for DRACOLoader Update

[epreston]

Related PR: #25475

Description

Update docs and add tests to support the updates to DRACOLoader.

Add DRACOLoader Tests
Update DRACOLoader docs.

[LeviPesin]

I think it was decided to remove all addons tests until all core classes are fully covered by them.

By the way, can we use import maps in tests?

[epreston]

Not sure. There's some very unique views on tests, I have concerns they won't get merged. Such a waste.

No import maps. Be sure to import the sources as the unit does to get clean tests or they will fail. Notice in this one I am importing the way the unit does. loader imported from the source is a different object to loader imported as a three export. Change the comment and try the inheritance test to see it error out.

[LeviPesin]

Related: #23348 #23352

[LeviPesin]

Notice in this one I am importing the way the unit does. loader imported from the source is a different object to loader imported as a three export. Change the commend and try the inheritance test to see it error out.

I think it should work if both are imported from three.

[epreston]

The javascript interpreter sees them as different types of objects. What we think doesn't change that. There's articles that go into it if you are interested. How about taking a few seconds to uncomment the line ?

I read those issues, I can see what they were missing. It catches me out too sometimes.

[Mugen87]

Please avoid the addition for unit tests for addons. Let's first improve the test coverage for the core.

[epreston]

I can help with that. Can you merge in my batch of test updates and I will complete the rest for core ?