ValueError when running a test inside a thread

[ebas]

When running tests, unittest.installHandler is called to catch SIGINT. This is impossible when it's not on the main thread, and will throw a ValueError.

Running tests inside a thread occurs, for example, when used in conjuction with autoreload, as used in:

• ​https://github.com/rca/django/commit/043e9723ae8fdb98745c2390f3ff92649bc106df
• ​https://github.com/garethr/django-test-extensions

Using either of these will result in a ValueError.

One might argue this is an unittest bug, but i disagree. Unittest doesn't automatically install this handler, therefor its the users (django) responsibility to use it appropriately.

Branch on github: ​https://github.com/ebas/django/tree/fix/simple.py-valueerror

[Łukasz Rekucki]

Why not just run the DjangoTestSuiteRunner in a subprocess instead of a thread? That should solve this issue (and probably a bunch of others as it's far from being thread-safe).