Some of the recent batch of licensing updates broke the JavaScript unit

tests. I had simply failed to update them, or at some point lost changes

to them. In either case, this change updates the unit tests to work

correctly.
There are two key updates made:


fetch spies now properly return a Response, rather than a raw

   object.


callAction() arguments are now expected to be non-serialized JSON

   data, and contain the missing session_token.

All JS unit tests pass.