--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebKitTools/Scripts/webkitpy/common/system/outputcapture.py	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,65 @@
+# Copyright (c) 2009, Google Inc. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+# 
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+# 
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+# Class for unittest support.  Used for capturing stderr/stdout.
+
+import sys
+from StringIO import StringIO
+
+class OutputCapture(object):
+    def __init__(self):
+        self.saved_outputs = dict()
+
+    def _capture_output_with_name(self, output_name):
+        self.saved_outputs[output_name] = getattr(sys, output_name)
+        setattr(sys, output_name, StringIO())
+
+    def _restore_output_with_name(self, output_name):
+        captured_output = getattr(sys, output_name).getvalue()
+        setattr(sys, output_name, self.saved_outputs[output_name])
+        del self.saved_outputs[output_name]
+        return captured_output
+
+    def capture_output(self):
+        self._capture_output_with_name("stdout")
+        self._capture_output_with_name("stderr")
+
+    def restore_output(self):
+        return (self._restore_output_with_name("stdout"), self._restore_output_with_name("stderr"))
+
+    def assert_outputs(self, testcase, function, args=[], kwargs={}, expected_stdout="", expected_stderr="", expected_exception=None):
+        self.capture_output()
+        if expected_exception:
+            return_value = testcase.assertRaises(expected_exception, function, *args, **kwargs)
+        else:
+            return_value = function(*args, **kwargs)
+        (stdout_string, stderr_string) = self.restore_output()
+        testcase.assertEqual(stdout_string, expected_stdout)
+        testcase.assertEqual(stderr_string, expected_stderr)
+        # This is a little strange, but I don't know where else to return this information.
+        return return_value