# HG changeset patch
# Parent 86a1f92c66b33530e2401f0cc82273e464c402ce
diff --git a/Lib/test/test_concurrent_futures.py b/Lib/test/test_concurrent_futures.py
--- a/Lib/test/test_concurrent_futures.py
+++ b/Lib/test/test_concurrent_futures.py
@@ -88,7 +88,7 @@
     executor_type = futures.ProcessPoolExecutor
 
 
-class ExecutorShutdownTest(unittest.TestCase):
+class ExecutorShutdownTest:
     def test_run_after_shutdown(self):
         self.executor.shutdown()
         self.assertRaises(RuntimeError,
@@ -116,7 +116,7 @@
             f.result()
 
 
-class ThreadPoolShutdownTest(ThreadPoolMixin, ExecutorShutdownTest):
+class ThreadPoolShutdownTest(ThreadPoolMixin, ExecutorShutdownTest, unittest.TestCase):
     def _prime_executor(self):
         pass
 
@@ -148,7 +148,8 @@
             t.join()
 
 
-class ProcessPoolShutdownTest(ProcessPoolMixin, ExecutorShutdownTest):
+class ProcessPoolShutdownTest(ProcessPoolMixin, ExecutorShutdownTest, unittest.TestCase):
+
     def _prime_executor(self):
         pass
 
@@ -183,7 +184,7 @@
         for p in processes.values():
             p.join()
 
-class WaitTests(unittest.TestCase):
+class WaitTests:
     def test_first_completed(self):
         future1 = self.executor.submit(mul, 21, 2)
         future2 = self.executor.submit(time.sleep, 1.5)
@@ -283,15 +284,15 @@
         self.assertEqual(set([future2]), pending)
 
 
-class ThreadPoolWaitTests(ThreadPoolMixin, WaitTests):
+class ThreadPoolWaitTests(ThreadPoolMixin, WaitTests, unittest.TestCase):
     pass
 
 
-class ProcessPoolWaitTests(ProcessPoolMixin, WaitTests):
+class ProcessPoolWaitTests(ProcessPoolMixin, WaitTests, unittest.TestCase):
     pass
 
 
-class AsCompletedTests(unittest.TestCase):
+class AsCompletedTests:
     # TODO(brian@sweetapp.com): Should have a test with a non-zero timeout.
     def test_no_timeout(self):
         future1 = self.executor.submit(mul, 2, 21)
@@ -329,15 +330,15 @@
                          completed_futures)
 
 
-class ThreadPoolAsCompletedTests(ThreadPoolMixin, AsCompletedTests):
+class ThreadPoolAsCompletedTests(ThreadPoolMixin, AsCompletedTests, unittest.TestCase):
     pass
 
 
-class ProcessPoolAsCompletedTests(ProcessPoolMixin, AsCompletedTests):
+class ProcessPoolAsCompletedTests(ProcessPoolMixin, AsCompletedTests, unittest.TestCase):
     pass
 
 
-class ExecutorTest(unittest.TestCase):
+class ExecutorTest:
     # Executor.shutdown() and context manager usage is tested by
     # ExecutorShutdownTest.
     def test_submit(self):
@@ -381,7 +382,7 @@
         self.executor.shutdown()
 
 
-class ThreadPoolExecutorTest(ThreadPoolMixin, ExecutorTest):
+class ThreadPoolExecutorTest(ThreadPoolMixin, ExecutorTest, unittest.TestCase):
     def test_map_submits_without_iteration(self):
         """Tests verifying issue 11777."""
         finished = []
@@ -393,7 +394,7 @@
         self.assertCountEqual(finished, range(10))
 
 
-class ProcessPoolExecutorTest(ProcessPoolMixin, ExecutorTest):
+class ProcessPoolExecutorTest(ProcessPoolMixin, ExecutorTest, unittest.TestCase):
     def test_killed_child(self):
         # When a child process is abruptly terminated, the whole pool gets
         # "broken".