Use default shared loader

Erlend E. Aasland · Erlend E. Aasland · commit d978b17787f5 · 2021-09-13T00:58:10.000+02:00
diff --git a/Lib/test/support/__init__.py b/Lib/test/support/__init__.py
@@ -1112,14 +1112,15 @@ def run_unittest(*classes):
     for cls in classes:
         if isinstance(cls, str):
             if cls in sys.modules:
-                loader = unittest.TestLoader()
+                loader = unittest.defaultTestLoader
                 suite.addTest(loader.loadTestsFromModule(sys.modules[cls]))
             else:
                 raise ValueError("str arguments must be keys in sys.modules")
         elif isinstance(cls, valid_types):
             suite.addTest(cls)
         else:
-            suite.addTest(unittest.TestLoader().loadTestsFromTestCase(cls))
+            loader = unittest.defaultTestLoader
+            suite.addTest(loader.loadTestsFromTestCase(cls))
     _filter_suite(suite, match_test)
     _run_suite(suite)
 
diff --git a/Lib/unittest/test/test_case.py b/Lib/unittest/test/test_case.py
@@ -440,7 +440,7 @@ def test_c(self):
 
         result = unittest.TestResult()
         result.failfast = True
-        suite = unittest.TestLoader().loadTestsFromTestCase(Foo)
+        suite = unittest.defaultTestLoader.loadTestsFromTestCase(Foo)
         suite.run(result)
 
         expected = ['a1', 'a2', 'b1']
