Sooo... turns out toolkit\mozapps\extensions\test\unit still exists, and contains tests for the old Add-ons Manager. ie, before The Great Rewrite(tm). This may come as a shock, but I propose removing that directory.

Comment on attachment 658397 [details] [diff] [review] Patch v1 Review of attachment 658397 [details] [diff] [review]: ----------------------------------------------------------------- So I originally left these in place because I thought they were issues that still needed testing even in the new world order. I think that's probably not true for bug 356370 but the other two I think it'd be nice to be tested. Will we ever remember to add tests if we remove these files? Probably not. Will we ever remember to add tests if we leave these files here? Probably not.

Indeed. At the very least, removing them from the tree saves time/effort, as people are currently still trying to update them (bug 758950, bug 759642, etc). https://hg.mozilla.org/integration/fx-team/rev/8d83eefa874f