Adding unittest.removeHandler function / decorator for removing the signal.SIGINT signal handler. With tests and docs.

1 files changed, 21 insertions, 0 deletions

diff --git a/Lib/unittest/test/test_break.py b/Lib/unittest/test/test_break.py
index cc3e282..5600011 100644
--- a/Lib/unittest/test/test_break.py
+++ b/Lib/unittest/test/test_break.py
@@ -229,3 +229,24 @@ class TestBreak(unittest.TestCase):
         self.assertEqual(p.result, result)
 
         self.assertNotEqual(signal.getsignal(signal.SIGINT), default_handler)
+
+    def testRemoveHandler(self):
+        default_handler = signal.getsignal(signal.SIGINT)
+        unittest.installHandler()
+        unittest.removeHandler()
+        self.assertEqual(signal.getsignal(signal.SIGINT), default_handler)
+
+        # check that calling removeHandler multiple times has no ill-effect
+        unittest.removeHandler()
+        self.assertEqual(signal.getsignal(signal.SIGINT), default_handler)
+
+    def testRemoveHandlerAsDecorator(self):
+        default_handler = signal.getsignal(signal.SIGINT)
+        unittest.installHandler()
+
+        @unittest.removeHandler
+        def test():
+            self.assertEqual(signal.getsignal(signal.SIGINT), default_handler)
+
+        test()
+        self.assertNotEqual(signal.getsignal(signal.SIGINT), default_handler)