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, 4 insertions, 2 deletions

diff --git a/Lib/test/test_yield_from.py b/Lib/test/test_yield_from.py
index ce21c3df81..4735ef4bee 100644
--- a/Lib/test/test_yield_from.py
+++ b/Lib/test/test_yield_from.py
@@ -11,6 +11,7 @@ import unittest
 import inspect
 
 from test.support import captured_stderr, disable_gc, gc_collect
+from test import support
 
 class TestPEP380Operation(unittest.TestCase):
     """
@@ -562,11 +563,12 @@ class TestPEP380Operation(unittest.TestCase):
             self.assertEqual(next(gi), 1)
             gi.throw(AttributeError)
 
-        with captured_stderr() as output:
+        with support.catch_unraisable_exception() as cm:
             gi = g()
             self.assertEqual(next(gi), 1)
             gi.close()
-        self.assertIn('ZeroDivisionError', output.getvalue())
+
+            self.assertEqual(ZeroDivisionError, cm.unraisable.exc_type)
 
     def test_exception_in_initial_next_call(self):
         """