Fix a few minor issues in the test suite

- enable gc-debugging
- fix two uncollectable tasklets
- skip a _H test, that requires soft-switching

Stackless/unittests/support.py

@@ -31,7 +31,10 @@
 import inspect
 from io import StringIO
 import contextlib
+import gc
 
+# emit warnings about uncollectable objects
+gc.set_debug(gc.DEBUG_UNCOLLECTABLE)
 try:
     long
 except NameError:
@@ -273,6 +276,7 @@ def tearDown(self):
                     activeThreads.pop().join(0.5)
                 active_count = threading.active_count()
             self.assertEqual(active_count, expected_thread_count, "Leakage from other threads, with %d threads running (%d expected)" % (active_count, expected_thread_count))
+        gc.collect()  # emits warnings about uncollectable objects after each test
 
     # limited pickling support for test cases
     # Between setUp() and tearDown() the test-case has a

Stackless/unittests/test_defects.py

@@ -119,8 +119,9 @@ def func(self):
             stackless.schedule_remove()
             self.fail("We shouldn't be here")
         stackless.run()  # flush all runnables
-        stackless.tasklet(func)(self)
+        t = stackless.tasklet(func)(self)
         stackless.run()
+        t.kill()  # avoid a resource leak caused by an uncollectable tasklet
 
     @require_one_thread
     def testScheduleRemove2(self):
@@ -383,6 +384,7 @@ def test_tasklet_end_with_wrong_recursion_level(self):
         tasklet of other thread ended. To do so, it creates a new temporary main tasklet. The
         assertion failure happens during the end of the killed tasklet.
         """
+        self.skipUnlessSoftswitching()
         if True:
             def print(*args):
                 pass
@@ -401,7 +403,7 @@ def other_thread_main():
             print("Other thread paused", self.tlet)
             self.tlet.run()
             self.assertGreaterEqual(self.tlet.recursion_depth, 2)
-            self.tlet.bind(lambda: None, ())
+            self.tlet.bind(lambda: None, ())  # requires soft switching
             self.assertEqual(self.tlet.recursion_depth, 0)
             # before issue #91 got fixed, the assertion violation occurred here
 

Stackless/unittests/test_watchdog.py

@@ -652,6 +652,9 @@ def watchdog1():
         stackless.run()
         self.assertLessEqual([None], self.watchdog_list)
         stackless.run()
+        # avoid a resource leak
+        for t in tasklets:
+            t.kill()
 
     def test_schedule_deeper_soft(self):
         self._test_schedule_deeper(True)