Where should all notes and smart filter test cases live?

I'm working on a fix that includes testing showing all notes and after I went through test files I found a file with this name feature_ShowAllNotes.js should I append the test case to it? the reason I'm asking because it lives in app-cli directory while the fix will be made for app-desktop and I need to have an instance of TestApp class so what's the correct directory or file to append the test case to?