[PATCH] get rid of DeprecationWarnings when running tests

Implemented the popen2.Popen4 interface using the subprocess.Popen backend, to avoid DeprecationWarnings when running the tests on python >= 2.6.

---
  cheetah/Tests/CheetahWrapper.py |   15 +++++++++++++--
  1 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/cheetah/Tests/CheetahWrapper.py b/cheetah/Tests/CheetahWrapper.py
index ca7b0ae..e152e68 100644
--- a/cheetah/Tests/CheetahWrapper.py
+++ b/cheetah/Tests/CheetahWrapper.py
@@ -12,7 +12,6 @@ Besides unittest usage, recognizes the following command-line options:
          Show the output of each subcommand.  (Normally suppressed.)
  '''
  import os
-import popen2
  import re                                     # Used by listTests.
  import shutil
  import sys
@@ -22,6 +21,18 @@ import unittest
  from optparse import OptionParser
  from Cheetah.CheetahWrapper import CheetahWrapper  # Used by NoBackup.
  
+try:
+    from subprocess import Popen, PIPE, STDOUT
+    class Popen4(Popen):
+        def __init__(self, cmd, bufsize=-1):
+            super(Popen4, self).__init__(cmd, bufsize=bufsize,
+                                         shell=True, close_fds=True,
+                                         stdin=PIPE, stdout=PIPE, stderr=STDOUT)
+            self.tochild = self.stdin
+            self.fromchild = self.stdout
+            self.childerr = self.stderr
+except ImportError:
+    from popen2 import Popen4
  
  DELETE = True # True to clean up after ourselves, False for debugging.
  OUTPUT = False # Normally False, True for debugging.
@@ -152,7 +163,7 @@ Found %(result)r"""
          return rc, output
  
      def assertPosixSubprocess(self, cmd):
-        process = popen2.Popen4(cmd)
+        process = Popen4(cmd)
          process.tochild.close()
          output = process.fromchild.read()
          status = process.wait()
-- 
1.6.2.5

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