Add unit tests for Editor

[Edvinas01]

Add tests for Editor folder which would test if the currently existing custom editors render as excepted. This would involve doing a bit of research on how to actually do that.

Don't forget to follow the guidelines on how to setup the folder structure. In addition to that, this article can give more insight in how it can be setup.

[Edvinas01]

Too overkill and too hard to test custom editors, closing.