Update setUpModule and add tearDownModule.

comtypes/test/test_dispinterface.py

@@ -2,17 +2,23 @@
 import unittest
 
 import comtypes.test.TestDispServer
-from comtypes.server.register import register  # , unregister
+from comtypes.server.register import register, unregister
 
 
 def setUpModule():
-    raise unittest.SkipTest(
-        "This test requires the tests to be run as admin since it tries to "
-        "register the test COM server.  Is this a good idea?"
-    )
+    try:
+        register(comtypes.test.TestDispServer.TestDispServer)
+    except WindowsError as e:
+        if e.winerror != 5:  # [Error 5] Access is denied
+            raise e
+        raise unittest.SkipTest(
+            "This test requires the tests to be run as admin since it tries to "
+            "register the test COM server."
+        )
+
 
-    # If this test is ever NOT skipped, then this line needs to run.  Keeping it here for posterity.
-    register(comtypes.test.TestDispServer.TestDispServer)
+def tearDownModule():
+    unregister(comtypes.test.TestDispServer.TestDispServer)
 
 
 @unittest.skip("This depends on 'pywin32'.")