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Diffstat (limited to 'WebKitTools/Scripts/webkitpy/outputcapture.py')
-rw-r--r-- | WebKitTools/Scripts/webkitpy/outputcapture.py | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/WebKitTools/Scripts/webkitpy/outputcapture.py b/WebKitTools/Scripts/webkitpy/outputcapture.py new file mode 100644 index 0000000..592a669 --- /dev/null +++ b/WebKitTools/Scripts/webkitpy/outputcapture.py @@ -0,0 +1,62 @@ +# 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=""): + self.capture_output() + 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 |