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[1.6.x] Final attempt to solve sporadic test failures.
tearDownClass is not called if setUpClass throws an exception, in our case this means that LiveServerTestCase leaks LiveServerThread sockets if the test happens to be skipped later on, and AdminSeleniumWebDriverTestCase doesn't close it's already open browser window. To prevent this leakage we catch errors where needed and manually call _tearDownClassInternal. _tearDownClassInternal should be written as defensively as possible since it is not allowed to make any assumptions on how far setUpClass got. This patch should fix the sporadic "Address already in use"-errors on jenkins and also the "This code isn't under transaction management"-error for sqlite (also just on jenkins). After discussion with koniiiik, jezdez, kmtracey, tos9, lifeless, nedbat and voidspace it was decided that this is the safest approach (thanks to everyone for their comments and help). Manually calling tearDownClass was shut down cause we don't know how our users override our classes. This is a private and very specialized API on purpose and should not be used without a strong reason! This patch partially reverts the earlier attempts to fix those issues, namely: 2fa0dd7 and 3c5775d Final note: If this patch breaks in a later version of Django, please be very careful on how you fix it, you might not see test failures locally. That said, this patch hopefully doesn't produce even more failures. Backport of 73a610d from master.
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