Ensure that repozo is importable.

src/ZODB/scripts/tests.py

@@ -26,6 +26,11 @@ checker = renormalizing.RENormalizing([
     (re.compile('hash=[0-9a-f]{40}'),
      'hash=b16422d09fabdb45d4e4325e4b42d7d6f021d3c3')])
 
+class RepozoTests(unittest.TestCase):
+
+    def test_importability(self):
+        from ZODB.scripts import repozo
+
 def test_suite():
     return unittest.TestSuite((
         doctest.DocFileSuite(