Add more subprocess2 tests with stderr=subproces2.STDOUT.

tests/subprocess2_test.py

 #!/usr/bin/env python
 # 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.
 
 """Unit tests for subprocess2.py."""
 
 import logging
 import optparse
 import os
@@ skipping 237 matching lines @@
       (out, err), code = subprocess2.communicate(
           e + ['--stdout', '--stderr'],
           stdout=subprocess2.PIPE,
           stderr=subprocess2.VOID,
           universal_newlines=un)
       self.assertEquals(c('A\nBB\nCCC\n'), out)
       self.assertEquals(None, err)
       self.assertEquals(0, code)
     self._run_test(fn)
 
+  def test_check_output_redirect_stderr_to_stdout_pipe(self):
+    def fn(c, e, un):
+      (out, err), code = subprocess2.communicate(
+          e + ['--stderr'],
+          stdout=subprocess2.PIPE,
+          stderr=subprocess2.STDOUT,
+          universal_newlines=un)
+      # stderr output into stdout.
+      self.assertEquals(c('a\nbb\nccc\n'), out)
+      self.assertEquals(None, err)
+      self.assertEquals(0, code)
+    self._run_test(fn)
+
+  def test_check_output_redirect_stderr_to_stdout(self):
+    def fn(c, e, un):
+      (out, err), code = subprocess2.communicate(
+          e + ['--stderr'],
+          stderr=subprocess2.STDOUT,
+          universal_newlines=un)
+      # stderr output into stdout but stdout is not piped.
+      self.assertEquals(None, out)
+      self.assertEquals(None, err)
+      self.assertEquals(0, code)
+    self._run_test(fn)
+
   def test_check_output_throw_stdout(self):
     def fn(c, e, un):
       try:
         subprocess2.check_output(
             e + ['--fail', '--stdout'], universal_newlines=un)
         self.fail()
       except subprocess2.CalledProcessError, e:
         self.assertEquals(c('A\nBB\nCCC\n'), e.stdout)
         self.assertEquals(None, e.stderr)
         self.assertEquals(64, e.returncode)
@@ skipping 104 matching lines @@
   return options.return_value
 
 
 if __name__ == '__main__':
   logging.basicConfig(level=
       [logging.WARNING, logging.INFO, logging.DEBUG][
         min(2, sys.argv.count('-v'))])
   if len(sys.argv) > 1 and sys.argv[1] == '--child':
     sys.exit(child_main(sys.argv[2:]))
   unittest.main()