1 files changed, 86 insertions, 0 deletions
diff --git a/Tools/Scripts/webkitpy/common/system/outputcapture.py b/Tools/Scripts/webkitpy/common/system/outputcapture.py
new file mode 100644
index 0000000..45e0e3f
--- /dev/null
+++ b/Tools/Scripts/webkitpy/common/system/outputcapture.py
@@ -0,0 +1,86 @@
+# 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
+import unittest
+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)
+        captured_output = StringIO()
+        setattr(sys, output_name, captured_output)
+        return captured_output
+
+    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):
+        return (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
+
+
+class OutputCaptureTestCaseBase(unittest.TestCase):
+    def setUp(self):
+        unittest.TestCase.setUp(self)
+        self.output_capture = OutputCapture()
+        (self.__captured_stdout, self.__captured_stderr) = self.output_capture.capture_output()
+
+    def tearDown(self):
+        del self.__captured_stdout
+        del self.__captured_stderr
+        self.output_capture.restore_output()
+        unittest.TestCase.tearDown(self)
+
+    def assertStdout(self, expected_stdout):
+        self.assertEquals(expected_stdout, self.__captured_stdout.getvalue())
+
+    def assertStderr(self, expected_stderr):
+        self.assertEquals(expected_stderr, self.__captured_stderr.getvalue())