Add most of testing improvements without the tee-specific tests

subprocess2.py

 # coding=utf8
 # Copyright (c) 2011 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 """Collection of subprocess wrapper functions.
 
 In theory you shouldn't need anything else in subprocess, or this module failed.
 """
 
 from __future__ import with_statement
@@ skipping 228 matching lines @@
     while proc.returncode is None:
       proc.poll()
       if timeout and (time.time() - start) > timeout:
         proc.kill()
         proc.wait()
         # It's -9 on linux and 1 on Windows. Standardize to TIMED_OUT.
         proc.returncode = TIMED_OUT
       time.sleep(0.001)
     # Now that the process died, reset the cursor and read the file.
     buff.seek(0)
-    out = [buff.read(), None]
+    out = (buff.read(), None)
   return out, proc.returncode
 
 
 def call(args, **kwargs):
   """Emulates subprocess.call().
 
   Automatically convert stdout=PIPE or stderr=PIPE to VOID.
   In no case they can be returned since no code path raises
   subprocess2.CalledProcessError.
   """
@@ skipping 41 matching lines @@
 
   Captures stdout of a process call and returns stdout only.
 
   - Throws if return code is not 0.
   - Works even prior to python 2.7.
   - Blocks stdin by default if not specified since no output will be visible.
   - As per doc, "The stdout argument is not allowed as it is used internally."
   """
   kwargs.setdefault('stdin', VOID)
   return check_call_out(args, stdout=PIPE, **kwargs)[0]