Try to make test_import a bit more robust
diff --git a/Lib/test/test_import.py b/Lib/test/test_import.py
index ebcc2ca..0332fdd 100644
--- a/Lib/test/test_import.py
+++ b/Lib/test/test_import.py
@@ -30,6 +30,9 @@
 
 class ImportTests(unittest.TestCase):
 
+    def setUp(self):
+        remove_files(TESTFN)
+
     def tearDown(self):
         unload(TESTFN)