Add more timeout values to test_poll_blocks_with_negative_ms

Author: pablogsal

Lib/test/test_poll.py

@@ -208,31 +208,33 @@ def test_threaded_poll(self):
     @reap_threads
     def test_poll_blocks_with_negative_ms(self):
 
-        # GIVEN
+        for timeout_ms in [None, -1, -1.0, -0.1, -1e-100]:
 
-        # Create two file descriptors. This will be used to unlock
-        # the blocking call to poll.poll inside the thread
+            # GIVEN
 
-        r, w = os.pipe()
-        self.addCleanup(os.close, r)
-        self.addCleanup(os.close, w)
+            # Create two file descriptors. This will be used to unlock
+            # the blocking call to poll.poll inside the thread
 
-        pollster = select.poll()
-        pollster.register(r, select.POLLIN)
+            r, w = os.pipe()
+            self.addCleanup(os.close, r)
+            self.addCleanup(os.close, w)
+
+            pollster = select.poll()
+            pollster.register(r, select.POLLIN)
 
-        # WHEN
+            # WHEN
 
-        poll_thread = threading.Thread(target=pollster.poll, args=(-1e-100,))
-        poll_thread.start()
-        poll_thread.join(timeout=0.1)
+            poll_thread = threading.Thread(target=pollster.poll, args=(timeout_ms,))
+            poll_thread.start()
+            poll_thread.join(timeout=0.1)
 
-        # THEN
-        self.assertTrue(poll_thread.is_alive())
+            # THEN
+            self.assertTrue(poll_thread.is_alive())
 
-        # Write to the pipe so pollster.poll unblocks and the thread ends.
-        os.write(w, b'spam')
-        poll_thread.join()
-        self.assertFalse(poll_thread.is_alive())
+            # Write to the pipe so pollster.poll unblocks and the thread ends.
+            os.write(w, b'spam')
+            poll_thread.join()
+            self.assertFalse(poll_thread.is_alive())