Fixed #17365, #17366, #18727 -- Switched to discovery test runner.

Thanks to Preston Timmons for the bulk of the work on the patch, especially
updating Django's own test suite to comply with the requirements of the new
runner. Thanks also to Jannis Leidel and Mahdi Yusuf for earlier work on the
patch and the discovery runner.

Refs #11077, #17032, and #18670.

1 files changed, 1 insertions, 1 deletions

diff --git a/django/utils/unittest/loader.py b/django/utils/unittest/loader.py
index 0bdd106d39..695bac40ef 100644
--- a/django/utils/unittest/loader.py
+++ b/django/utils/unittest/loader.py
@@ -125,7 +125,7 @@ class TestLoader(unittest.TestLoader):
             return self.loadTestsFromTestCase(obj)
         elif (isinstance(obj, types.UnboundMethodType) and
               isinstance(parent, type) and
-              issubclass(parent, case.TestCase)):
+              issubclass(parent, unittest.TestCase)):
             return self.suiteClass([parent(obj.__name__)])
         elif isinstance(obj, unittest.TestSuite):
             return obj