Changed test so it no longer runs as a side effect of importing.

Lib/test/test_imaplib.py

 import imaplib
 import time
 
-# We can check only that it successfully produces a result,
-# not the correctness of the result itself, since the result
-# depends on the timezone the machine is in.
+from test import test_support
+import unittest
 
-timevalues = [2000000000, 2000000000.0, time.localtime(2000000000),
-              '"18-May-2033 05:33:20 +0200"']
 
-for t in timevalues:
-    imaplib.Time2Internaldate(t)
+class TestImaplib(unittest.TestCase):
+    def test_that_Time2Internaldate_returns_a_result(self):
+        # We can check only that it successfully produces a result,
+        # not the correctness of the result itself, since the result
+        # depends on the timezone the machine is in.
+        timevalues = [2000000000, 2000000000.0, time.localtime(2000000000),
+                      '"18-May-2033 05:33:20 +0200"']
+
+        for t in timevalues:
+            imaplib.Time2Internaldate(t)
+
+
+def test_main():
+    test_support.run_unittest(TestImaplib)
+
+
+if __name__ == "__main__":
+    unittest.main()