Index: Lib/unittest/test/test_program.py
===================================================================
--- Lib/unittest/test/test_program.py	(revision 86636)
+++ Lib/unittest/test/test_program.py	(working copy)
@@ -64,16 +64,23 @@
             return self.suiteClass(
                 [self.loadTestsFromTestCase(Test_TestProgram.FooBar)])
 
+    def register_restore_path(self):
+        """Used by tests that invoke discovery, which may modify sys.path"""
+        orig_sys_path = sys.path[:]
+        def restore_path():
+            sys.path[:] = orig_sys_path
+        self.addCleanup(restore_path)
 
     def test_NonExit(self):
+        self.register_restore_path()
         program = unittest.main(exit=False,
                                 argv=["foobar"],
                                 testRunner=unittest.TextTestRunner(stream=io.StringIO()),
                                 testLoader=self.FooBarLoader())
         self.assertTrue(hasattr(program, 'result'))
 
-
     def test_Exit(self):
+        self.register_restore_path()
         self.assertRaises(
             SystemExit,
             unittest.main,
@@ -84,6 +91,7 @@
 
 
     def test_ExitAsDefault(self):
+        self.register_restore_path()
         self.assertRaises(
             SystemExit,
             unittest.main,