I can imagine something like a code-collapse indicator next to every method in a class (or function or code block, whatever), which would expand tests that can

I can imagine something like a code-collapse indicator next to every method in a class (or function or code block, whatever), which would expand tests that can be run on-the-fly - even while you type. Kind of like how comments can be collapsed in some IDEs. Technically, these could very well be simple commented annotations that point to a separate .test file or something, but are shown in-line by your favorite IDE or code-editor.