bpo-37069: tests use catch_unraisable_exception() (GH-13762)

Modify test_coroutines, test_cprofile, test_generators, test_raise,
test_ssl and test_yield_from to use
support.catch_unraisable_exception() rather than
support.captured_stderr().

test_thread: remove test_save_exception_state_on_error() which is now
updated. test_unraisable_exception() checks that sys.unraisablehook()
is called to handle _thread.start_new_thread() exception.

test_cprofile now rely on unittest for test discovery: replace
support.run_unittest() with unittest.main().

1 files changed, 9 insertions, 3 deletions

diff --git a/Lib/test/test_coroutines.py b/Lib/test/test_coroutines.py
index b406b1c3ebf..208b5c2ccf5 100644
--- a/Lib/test/test_coroutines.py
+++ b/Lib/test/test_coroutines.py
@@ -2032,11 +2032,17 @@ class CoroutineTest(unittest.TestCase):
     def test_fatal_coro_warning(self):
         # Issue 27811
         async def func(): pass
-        with warnings.catch_warnings(), support.captured_stderr() as stderr:
+        with warnings.catch_warnings(), \
+             support.catch_unraisable_exception() as cm:
             warnings.filterwarnings("error")
-            func()
+            coro = func()
+            # only store repr() to avoid keeping the coroutine alive
+            coro_repr = repr(coro)
+            coro = None
             support.gc_collect()
-        self.assertIn("was never awaited", stderr.getvalue())
+
+            self.assertIn("was never awaited", str(cm.unraisable.exc_value))
+            self.assertEqual(repr(cm.unraisable.object), coro_repr)
 
     def test_for_assign_raising_stop_async_iteration(self):
         class BadTarget: