diff --git a/contrib/synthrepo.py b/contrib/synthrepo.py
--- a/contrib/synthrepo.py
+++ b/contrib/synthrepo.py
@@ -62,11 +62,11 @@ from mercurial import (
     util,
 )
 
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 cmdtable = {}
 command = cmdutil.command(cmdtable)
diff --git a/hgext/acl.py b/hgext/acl.py
--- a/hgext/acl.py
+++ b/hgext/acl.py
@@ -204,11 +204,11 @@ from mercurial import (
 
 urlreq = util.urlreq
 
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 def _getusers(ui, group):
 
diff --git a/hgext/blackbox.py b/hgext/blackbox.py
--- a/hgext/blackbox.py
+++ b/hgext/blackbox.py
@@ -51,11 +51,11 @@ from mercurial import (
 
 cmdtable = {}
 command = cmdutil.command(cmdtable)
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 lastui = None
 
 filehandles = {}
diff --git a/hgext/bugzilla.py b/hgext/bugzilla.py
--- a/hgext/bugzilla.py
+++ b/hgext/bugzilla.py
@@ -294,11 +294,11 @@ from mercurial import (
 urlparse = util.urlparse
 xmlrpclib = util.xmlrpclib
 
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 class bzaccess(object):
     '''Base class for access to Bugzilla.'''
diff --git a/hgext/censor.py b/hgext/censor.py
--- a/hgext/censor.py
+++ b/hgext/censor.py
@@ -42,11 +42,11 @@ from mercurial import (
 
 cmdtable = {}
 command = cmdutil.command(cmdtable)
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 @command('censor',
     [('r', 'rev', '', _('censor file from specified revision'), _('REV')),
diff --git a/hgext/chgserver.py b/hgext/chgserver.py
--- a/hgext/chgserver.py
+++ b/hgext/chgserver.py
@@ -63,11 +63,11 @@ from mercurial import (
     util,
 )
 
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 _log = commandserver.log
 
diff --git a/hgext/children.py b/hgext/children.py
--- a/hgext/children.py
+++ b/hgext/children.py
@@ -26,11 +26,11 @@ templateopts = commands.templateopts
 
 cmdtable = {}
 command = cmdutil.command(cmdtable)
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 @command('children',
     [('r', 'rev', '',
diff --git a/hgext/churn.py b/hgext/churn.py
--- a/hgext/churn.py
+++ b/hgext/churn.py
@@ -26,11 +26,11 @@ from mercurial import (
 
 cmdtable = {}
 command = cmdutil.command(cmdtable)
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 def maketemplater(ui, repo, tmpl):
     return cmdutil.changeset_templater(ui, repo, False, None, tmpl, None, False)
diff --git a/hgext/clonebundles.py b/hgext/clonebundles.py
--- a/hgext/clonebundles.py
+++ b/hgext/clonebundles.py
@@ -169,7 +169,7 @@ from mercurial import (
     wireproto,
 )
 
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 def capabilities(orig, repo, proto):
     caps = orig(repo, proto)
diff --git a/hgext/color.py b/hgext/color.py
--- a/hgext/color.py
+++ b/hgext/color.py
@@ -170,11 +170,11 @@ from mercurial import (
 
 cmdtable = {}
 command = cmdutil.command(cmdtable)
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 # start and stop parameters for effects
 _effects = {'none': 0, 'black': 30, 'red': 31, 'green': 32, 'yellow': 33,
diff --git a/hgext/convert/__init__.py b/hgext/convert/__init__.py
--- a/hgext/convert/__init__.py
+++ b/hgext/convert/__init__.py
@@ -23,11 +23,11 @@ from . import (
 
 cmdtable = {}
 command = cmdutil.command(cmdtable)
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 # Commands definition was moved elsewhere to ease demandload job.
 
diff --git a/hgext/eol.py b/hgext/eol.py
--- a/hgext/eol.py
+++ b/hgext/eol.py
@@ -104,11 +104,11 @@ from mercurial import (
     util,
 )
 
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 # Matches a lone LF, i.e., one that is not part of CRLF.
 singlelf = re.compile('(^|[^\r])\n')
diff --git a/hgext/extdiff.py b/hgext/extdiff.py
--- a/hgext/extdiff.py
+++ b/hgext/extdiff.py
@@ -84,11 +84,11 @@ from mercurial import (
 
 cmdtable = {}
 command = cmdutil.command(cmdtable)
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 def snapshot(ui, repo, files, node, tmproot, listsubrepos):
     '''snapshot files as of some revision
diff --git a/hgext/fetch.py b/hgext/fetch.py
--- a/hgext/fetch.py
+++ b/hgext/fetch.py
@@ -26,11 +26,11 @@ from mercurial import (
 release = lock.release
 cmdtable = {}
 command = cmdutil.command(cmdtable)
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 @command('fetch',
     [('r', 'rev', [],
diff --git a/hgext/fsmonitor/__init__.py b/hgext/fsmonitor/__init__.py
--- a/hgext/fsmonitor/__init__.py
+++ b/hgext/fsmonitor/__init__.py
@@ -113,11 +113,11 @@ from . import (
     watchmanclient,
 )
 
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 # This extension is incompatible with the following blacklisted extensions
 # and will disable itself when encountering one of these:
diff --git a/hgext/gpg.py b/hgext/gpg.py
--- a/hgext/gpg.py
+++ b/hgext/gpg.py
@@ -23,11 +23,11 @@ from mercurial import (
 
 cmdtable = {}
 command = cmdutil.command(cmdtable)
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 class gpg(object):
     def __init__(self, path, key=None):
diff --git a/hgext/graphlog.py b/hgext/graphlog.py
--- a/hgext/graphlog.py
+++ b/hgext/graphlog.py
@@ -25,11 +25,11 @@ from mercurial import (
 
 cmdtable = {}
 command = cmdutil.command(cmdtable)
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 @command('glog',
     [('f', 'follow', None,
diff --git a/hgext/hgk.py b/hgext/hgk.py
--- a/hgext/hgk.py
+++ b/hgext/hgk.py
@@ -54,11 +54,11 @@ from mercurial import (
 
 cmdtable = {}
 command = cmdutil.command(cmdtable)
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 @command('debug-diff-tree',
     [('p', 'patch', None, _('generate patch')),
diff --git a/hgext/highlight/__init__.py b/hgext/highlight/__init__.py
--- a/hgext/highlight/__init__.py
+++ b/hgext/highlight/__init__.py
@@ -41,11 +41,11 @@ from mercurial import (
     fileset,
 )
 
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 def pygmentize(web, field, fctx, tmpl):
     style = web.config('web', 'pygments_style', 'colorful')
diff --git a/hgext/histedit.py b/hgext/histedit.py
--- a/hgext/histedit.py
+++ b/hgext/histedit.py
@@ -213,11 +213,11 @@ class _constraints(object):
     def known(cls):
         return set([v for k, v in cls.__dict__.items() if k[0] != '_'])
 
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 actiontable = {}
 primaryactions = set()
diff --git a/hgext/journal.py b/hgext/journal.py
--- a/hgext/journal.py
+++ b/hgext/journal.py
@@ -39,11 +39,11 @@ from . import share
 cmdtable = {}
 command = cmdutil.command(cmdtable)
 
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 # storage format version; increment when the format changes
 storageversion = 0
diff --git a/hgext/keyword.py b/hgext/keyword.py
--- a/hgext/keyword.py
+++ b/hgext/keyword.py
@@ -112,11 +112,11 @@ from mercurial import (
 
 cmdtable = {}
 command = cmdutil.command(cmdtable)
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 # hg commands that do not act on keywords
 nokwcommands = ('add addremove annotate bundle export grep incoming init log'
diff --git a/hgext/largefiles/__init__.py b/hgext/largefiles/__init__.py
--- a/hgext/largefiles/__init__.py
+++ b/hgext/largefiles/__init__.py
@@ -119,11 +119,11 @@ from . import (
     uisetup as uisetupmod,
 )
 
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 reposetup = reposetup.reposetup
 
diff --git a/hgext/logtoprocess.py b/hgext/logtoprocess.py
--- a/hgext/logtoprocess.py
+++ b/hgext/logtoprocess.py
@@ -40,11 +40,11 @@ import platform
 import subprocess
 import sys
 
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 def uisetup(ui):
     if platform.system() == 'Windows':
diff --git a/hgext/mq.py b/hgext/mq.py
--- a/hgext/mq.py
+++ b/hgext/mq.py
@@ -99,11 +99,11 @@ seriesopts = [('s', 'summary', None, _('
 
 cmdtable = {}
 command = cmdutil.command(cmdtable)
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 # force load strip extension formerly included in mq and import some utility
 try:
diff --git a/hgext/notify.py b/hgext/notify.py
--- a/hgext/notify.py
+++ b/hgext/notify.py
@@ -148,11 +148,11 @@ from mercurial import (
     util,
 )
 
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 # template for single changeset can include email headers.
 single_template = '''
diff --git a/hgext/pager.py b/hgext/pager.py
--- a/hgext/pager.py
+++ b/hgext/pager.py
@@ -75,11 +75,11 @@ from mercurial import (
     util,
     )
 
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 def _runpager(ui, p):
     pager = subprocess.Popen(p, shell=True, bufsize=-1,
diff --git a/hgext/patchbomb.py b/hgext/patchbomb.py
--- a/hgext/patchbomb.py
+++ b/hgext/patchbomb.py
@@ -87,11 +87,11 @@ stringio = util.stringio
 
 cmdtable = {}
 command = cmdutil.command(cmdtable)
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 def _addpullheader(seq, ctx):
     """Add a header pointing to a public URL where the changeset is available
diff --git a/hgext/purge.py b/hgext/purge.py
--- a/hgext/purge.py
+++ b/hgext/purge.py
@@ -38,11 +38,11 @@ from mercurial import (
 
 cmdtable = {}
 command = cmdutil.command(cmdtable)
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 @command('purge|clean',
     [('a', 'abort-on-err', None, _('abort if an error occurs')),
diff --git a/hgext/rebase.py b/hgext/rebase.py
--- a/hgext/rebase.py
+++ b/hgext/rebase.py
@@ -66,11 +66,11 @@ revskipped = (revignored, revprecursor, 
 
 cmdtable = {}
 command = cmdutil.command(cmdtable)
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 def _nothingtorebase():
     return 1
diff --git a/hgext/record.py b/hgext/record.py
--- a/hgext/record.py
+++ b/hgext/record.py
@@ -22,11 +22,11 @@ from mercurial import (
 
 cmdtable = {}
 command = cmdutil.command(cmdtable)
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 
 @command("record",
diff --git a/hgext/relink.py b/hgext/relink.py
--- a/hgext/relink.py
+++ b/hgext/relink.py
@@ -21,11 +21,11 @@ from mercurial import (
 
 cmdtable = {}
 command = cmdutil.command(cmdtable)
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 @command('relink', [], _('[ORIGIN]'))
 def relink(ui, repo, origin=None, **opts):
diff --git a/hgext/schemes.py b/hgext/schemes.py
--- a/hgext/schemes.py
+++ b/hgext/schemes.py
@@ -56,11 +56,11 @@ from mercurial import (
 
 cmdtable = {}
 command = cmdutil.command(cmdtable)
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 
 class ShortRepository(object):
diff --git a/hgext/share.py b/hgext/share.py
--- a/hgext/share.py
+++ b/hgext/share.py
@@ -56,11 +56,11 @@ parseurl = hg.parseurl
 
 cmdtable = {}
 command = cmdutil.command(cmdtable)
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 @command('share',
     [('U', 'noupdate', None, _('do not create a working directory')),
diff --git a/hgext/shelve.py b/hgext/shelve.py
--- a/hgext/shelve.py
+++ b/hgext/shelve.py
@@ -54,11 +54,11 @@ from . import (
 
 cmdtable = {}
 command = cmdutil.command(cmdtable)
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 backupdir = 'shelve-backup'
 shelvedir = 'shelved'
diff --git a/hgext/strip.py b/hgext/strip.py
--- a/hgext/strip.py
+++ b/hgext/strip.py
@@ -23,11 +23,11 @@ release = lockmod.release
 
 cmdtable = {}
 command = cmdutil.command(cmdtable)
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 def checksubstate(repo, baserev=None):
     '''return list of subrepos at a different revision than substate.
diff --git a/hgext/transplant.py b/hgext/transplant.py
--- a/hgext/transplant.py
+++ b/hgext/transplant.py
@@ -40,11 +40,11 @@ class TransplantError(error.Abort):
 
 cmdtable = {}
 command = cmdutil.command(cmdtable)
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 class transplantentry(object):
     def __init__(self, lnode, rnode):
diff --git a/hgext/win32mbcs.py b/hgext/win32mbcs.py
--- a/hgext/win32mbcs.py
+++ b/hgext/win32mbcs.py
@@ -55,11 +55,11 @@ from mercurial import (
     error,
 )
 
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 _encoding = None                                # see extsetup
 
diff --git a/hgext/win32text.py b/hgext/win32text.py
--- a/hgext/win32text.py
+++ b/hgext/win32text.py
@@ -52,11 +52,11 @@ from mercurial import (
     util,
 )
 
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 # regexp for single LF without CR preceding.
 re_single_lf = re.compile('(^|[^\r])\n', re.MULTILINE)
diff --git a/hgext/zeroconf/__init__.py b/hgext/zeroconf/__init__.py
--- a/hgext/zeroconf/__init__.py
+++ b/hgext/zeroconf/__init__.py
@@ -40,11 +40,11 @@ from mercurial.hgweb import (
     server as servermod
 )
 
-# Note for extension authors: ONLY specify testedwith = 'internal' for
+# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
-testedwith = 'internal'
+testedwith = 'ships-with-hg-core'
 
 # publish
 
diff --git a/mercurial/commands.py b/mercurial/commands.py
--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -2396,6 +2396,10 @@ def debugextensions(ui, **opts):
     for extname, extmod in sorted(exts, key=operator.itemgetter(0)):
         extsource = extmod.__file__
         exttestedwith = getattr(extmod, 'testedwith', '').split()
+        if exttestedwith == ['ships-with-hg-core']:
+            showtestedwith = ['internal']
+        else:
+            showtestedwith = exttestedwith
         extbuglink = getattr(extmod, 'buglink', None)
 
         fm.startitem()
@@ -2406,7 +2410,8 @@ def debugextensions(ui, **opts):
             fm.write('name', '%s', extname)
             if not exttestedwith:
                 fm.plain(_(' (untested!)\n'))
-            elif exttestedwith == ['internal'] or hgver in exttestedwith:
+            elif (exttestedwith == ['ships-with-hg-core']
+                  or hgver in exttestedwith):
                 fm.plain('\n')
             else:
                 lasttestedversion = exttestedwith[-1]
@@ -2415,9 +2420,9 @@ def debugextensions(ui, **opts):
         fm.condwrite(ui.verbose and extsource, 'source',
                  _('  location: %s\n'), extsource or "")
 
-        fm.condwrite(ui.verbose and exttestedwith, 'testedwith',
+        fm.condwrite(ui.verbose and showtestedwith, 'testedwith',
                      _('  tested with: %s\n'),
-                     fm.formatlist(exttestedwith, name='ver'))
+                     fm.formatlist(showtestedwith, name='ver'))
 
         fm.condwrite(ui.verbose and extbuglink, 'buglink',
                  _('  bug reporting: %s\n'), extbuglink or "")
diff --git a/mercurial/dispatch.py b/mercurial/dispatch.py
--- a/mercurial/dispatch.py
+++ b/mercurial/dispatch.py
@@ -927,7 +927,7 @@ def _exceptionwarning(ui):
                 break
 
             # Never blame on extensions bundled with Mercurial.
-            if testedwith == 'internal':
+            if testedwith == 'ships-with-hg-core':
                 continue
 
             tested = [util.versiontuple(t, 2) for t in testedwith.split()]
diff --git a/mercurial/extensions.py b/mercurial/extensions.py
--- a/mercurial/extensions.py
+++ b/mercurial/extensions.py
@@ -532,4 +532,4 @@ def moduleversion(module):
 
 def ismoduleinternal(module):
     exttestedwith = getattr(module, 'testedwith', None)
-    return exttestedwith == "internal"
+    return exttestedwith == "ships-with-hg-core"