tests/dumbhttp: use absolute_import

tests/dumbhttp.py

@@ -1,13 +1,22 b''
 #!/usr/bin/env python
 
+from __future__ import absolute_import
+
 """
 Small and dumb HTTP server for use in tests.
 """
 
-from optparse import OptionParser
-import BaseHTTPServer, SimpleHTTPServer, signal, sys
+import optparse
+import BaseHTTPServer
+import signal
+import SimpleHTTPServer
+import sys
 
-from mercurial import cmdutil
+from mercurial import (
+    cmdutil,
+)
+
+OptionParser = optparse.OptionParser
 
 class simplehttpservice(object):
     def __init__(self, host, port):

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/dumbhttp.py not using absolute_import
   tests/fakedirstatewritetime.py not using absolute_import
   tests/fakepatchtime.py not using absolute_import
   tests/filterpyflakes.py not using absolute_import