Cant create a TestScript in Test Runner [Visual Studio]

I just cant seem to get the Test Runner to work properly. Could anyone explain to me why i can’t create test scripts in any of the folders?

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First Create a Folder with the option “Create Test Assembly Folder”
Inside it, right click and create a Test File
Ready

Just make sure the test file is inside a folder called ”Editor”, and Unity should automagically find it!

No need for test assemblies afaik.