blackbox: use absolute_import

hgext/blackbox.py

@@ -29,9 +29,16 b' Examples::'
 
 """
 
-from mercurial import util, cmdutil
+from __future__ import absolute_import
+
+import errno
+import re
+
 from mercurial.i18n import _
-import errno, re
+from mercurial import (
+    cmdutil,
+    util,
+)
 
 cmdtable = {}
 command = cmdutil.command(cmdtable)

tests/test-check-py3-compat.t

@@ -32,7 +32,6 b''
   doc/gendoc.py not using absolute_import
   doc/hgmanpage.py not using absolute_import
   hgext/__init__.py not using absolute_import
-  hgext/blackbox.py not using absolute_import
   hgext/bugzilla.py not using absolute_import
   hgext/censor.py not using absolute_import
   hgext/children.py not using absolute_import