--- a/mercurial/extensions.py	Thu Aug 25 01:00:26 2016 -0400
+++ b/mercurial/extensions.py	Tue Aug 23 11:26:08 2016 -0400
@@ -532,4 +532,4 @@
 
 def ismoduleinternal(module):
     exttestedwith = getattr(module, 'testedwith', None)
-    return exttestedwith == "internal"
+    return exttestedwith == "ships-with-hg-core"