py3: use absolute_import in test-context.py

tests/test-check-py3-compat.t

@@ -53,7 +53,6 b''
   tests/svn-safe-append.py not using absolute_import
   tests/svnxml.py not using absolute_import
   tests/test-atomictempfile.py not using absolute_import
-  tests/test-context.py not using absolute_import
   tests/test-context.py requires print_function
   tests/test-demandimport.py not using absolute_import
   tests/test-demandimport.py requires print_function

tests/test-context.py

@@ -1,5 +1,11 b''
+from __future__ import absolute_import
 import os
-from mercurial import hg, ui, context, encoding
+from mercurial import (
+    hg,
+    ui,
+    context,
+    encoding,
+)
 
 u = ui.ui()