Having done unit tests for so long, there is a tendency to forget that when you start doing QA work you need to make sure your test cases are recorded somewhere so they can be found by others later. The test code you write is always there in the unit test! Hopefully it makes sense to others.
Since I do a QA role, I'm not touching anyone else's unit tests. I end up using a combination of automation (always in Python and mostly with pytest) and manual testing. Things like API contract tests (did they add new fields to their API without telling me?!?) or scripts written by developers to verify things like "are the cryptographic signatures for this data still correct".
At Mozilla we use Bugzilla to track pretty much everything that we do. Pretty much all of my testing happens when one of the projects I do QA work for is ready to do a new release. A "bug" is created, I am assigned to it as the QA contact and away we go with the process to get code approved by QA for deployment to production.
For example, here's me running some scripts and reporting the results along with a question:
(Turns out I can only run that xml-verifier script in our staging environment)
We use virtualenv a lot to create small sandboxed environments to run our tests in, and the developers on the Kinto Project have been very good at creating small little tools for me to use to help with testing things.
So not only did I have to test that all the signatures remain the same, I also needed to do some manual testing to ensure the admin UI they created works as expected.
We are starting to use TestRail to track our software test cases. One of the goals is to use it's API and make calls to it as part of test runs -- we're in the early stages, but that is something I am working on this upcoming week.
Here's an example of me outlining the manual process of adding some fonts to the collection that Fennec uses.
Later in the same "bug" about deploying Kinto, I added my notes on doing the manual testing for uploading fonts.
Python + Pytest + Virtualenv + Bugzilla + TestRails == my tools for testing.