unittest TestLoader test discovery filename matching done in a method. This makes it easier to override the matching strategy in subclasses. No behaviour change in actual implementation.

Lib/unittest/loader.py

@@ -230,6 +230,10 @@ class TestLoader(object):
         __import__(name)
         return sys.modules[name]
 
+    def _match_path(self, path, full_path, pattern):
+        # override this method to use alternative matching strategy
+        return fnmatch(path, pattern)
+
     def _find_tests(self, start_dir, pattern):
         """Used by discovery. Yields test suites it loads."""
         paths = os.listdir(start_dir)
@@ -240,8 +244,8 @@ class TestLoader(object):
                 if not VALID_MODULE_NAME.match(path):
                     # valid Python identifiers only
                     continue
-
-                if fnmatch(path, pattern):
+                if not self._match_path(path, full_path, pattern):
+                    continue
                 # if the test file matches, load it
                 name = self._get_name_from_path(full_path)
                 try: