tests/autodiff.py: use absolute_import

tests/autodiff.py

@@ -1,7 +1,13 b''
 # Extension dedicated to test patch.diff() upgrade modes
-#
-#
-from mercurial import cmdutil, scmutil, patch, error
+
+from __future__ import absolute_import
+
+from mercurial import (
+    cmdutil,
+    error,
+    patch,
+    scmutil,
+)
 
 cmdtable = {}
 command = cmdutil.command(cmdtable)

tests/test-check-py3-compat.t

@@ -143,7 +143,6 b''
   mercurial/util.py not using absolute_import
   mercurial/windows.py not using absolute_import
   setup.py not using absolute_import
-  tests/autodiff.py not using absolute_import
   tests/dumbhttp.py not using absolute_import
   tests/fakedirstatewritetime.py not using absolute_import
   tests/fakepatchtime.py not using absolute_import