Silent error when testing bundled editor

[Reinmar]

There's an ugly issue when trying to run tests for bundled editor.

First, I get error here:

ckeditor5/dev/bender/plugins/ckeditor5/static/extensions.js

Line 67 in 4a66865

.split( '/' )

It's super strange, because when I stop debugger at that error, the variable doesn't seem to be undefined ;|.

Second, since that failed, loading CKEditorError which is needed to extend chai fails too.

This is really weird from the very beginning, because there's no difference between bundled and not bundled test. But it made me realise something different – that chai's extension is not going to work in tests with bundled editors, because the bundle contains a different instance of that class than what require.js loads.

So, I decided to not extend chain in those specific tests... but how to achieve that? I've got no idea. Bender doesn't give me the test config, so I cannot execute this code conditionally. Plus, why the code fails in the first place? :|

[Reinmar]

We removed the chai extension, so the error is gone.