Index: Lib/test/test_subprocess.py
===================================================================
--- Lib/test/test_subprocess.py	2009-10-15 23:51:58.000000000 +0200
+++ Lib/test/test_subprocess.py 2009-10-16 00:02:10.000000000 +0200
@@ -648,7 +648,8 @@
             os.remove(fname)
             self.assertEqual(rc, 47)
 
-        def DISABLED_test_send_signal(self):
+        def test_send_signal(self):
+            # send_signal() to the child process 
             p = subprocess.Popen([sys.executable,
                               "-c", "input()"])
 
@@ -656,7 +657,8 @@
             p.send_signal(signal.SIGINT)
             self.assertNotEqual(p.wait(), 0)
 
-        def DISABLED_test_kill(self):
+        def test_kill(self):
+            # kill() the child process
             p = subprocess.Popen([sys.executable,
                             "-c", "input()"])
 
@@ -664,7 +666,8 @@
             p.kill()
             self.assertEqual(p.wait(), -signal.SIGKILL)
 
-        def DISABLED_test_terminate(self):
+        def test_terminate(self):
+            # terminate() the child process
             p = subprocess.Popen([sys.executable,
                             "-c", "input()"])
 
@@ -672,6 +675,17 @@
             p.terminate()
             self.assertEqual(p.wait(), -signal.SIGTERM)
 
+        def test_terminate_already_terminated_child(self):
+            # try to terminate an already terminated child
+            p = subprocess.Popen([sys.executable,
+                            "-c", "input()"])
+
+            self.assertTrue(p.poll() is None, p.poll())
+            p.terminate()
+            self.assertEqual(p.wait(), -signal.SIGTERM)
+            # now that the child has been terminated, we should get an OSError if
+            # we try to terminate that pid
+            self.assertRaises(OSError, p.terminate)
     #
     # Windows tests
     #
@@ -742,7 +756,8 @@
                                  ' -c "import sys; sys.exit(47)"')
             self.assertEqual(rc, 47)
 
-        def DISABLED_test_send_signal(self):
+        def test_send_signal(self):
+            # send a signal to the child process. Only SIGTERM is supported
             p = subprocess.Popen([sys.executable,
                               "-c", "input()"])
 
@@ -750,7 +765,8 @@
             p.send_signal(signal.SIGTERM)
             self.assertNotEqual(p.wait(), 0)
 
-        def DISABLED_test_kill(self):
+        def test_kill(self):
+            # kill() the child process
             p = subprocess.Popen([sys.executable,
                             "-c", "input()"])
 
@@ -758,7 +774,8 @@
             p.kill()
             self.assertNotEqual(p.wait(), 0)
 
-        def DISABLED_test_terminate(self):
+        def test_terminate(self):
+            # terminate() the child process
             p = subprocess.Popen([sys.executable,
                             "-c", "input()"])
 
@@ -766,6 +783,17 @@
             p.terminate()
             self.assertNotEqual(p.wait(), 0)
 
+        def test_terminate_already_terminated_child(self):
+            # try to terminate an already terminated child
+            p = subprocess.Popen([sys.executable,
+                            "-c", "input()"])
+
+            self.assertTrue(p.poll() is None, p.poll())
+            p.terminate()
+            self.assertEqual(p.wait(), -signal.SIGTERM)
+            # now that the child has been terminated, we should get an OSError if
+            # we try to terminate that pid
+            self.assertRaises(OSError, p.terminate)
 
 unit_tests = [ProcessTestCase]