Currently, the plug-in and the Editor have little automatic testing: testing is mostly done manually, which is suboptimal. The current Editor tester is also not so nice and outdated. I'm not sure what is best to do...

A lot of unit tests for the object model were added during the serialization refactoring. These unit tests ensure that validation and serialization work correctly. The plug-in is inherently difficult to test automatically, so I won't do that.

The Editor could be tested automatically, but I will postpone this to if/when I refactor the Editor UI. I deleted the current outdated tests since their burden on development is more than they are worth.