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diff --git a/googletest/test/googletest-env-var-test.py b/googletest/test/googletest-env-var-test.py
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+#!/usr/bin/env python
+#
+# Copyright 2008, 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.
+
+"""Verifies that Google Test correctly parses environment variables."""
+
+import os
+import gtest_test_utils
+
+
+IS_WINDOWS = os.name == 'nt'
+IS_LINUX = os.name == 'posix' and os.uname()[0] == 'Linux'
+
+COMMAND = gtest_test_utils.GetTestExecutablePath('googletest-env-var-test_')
+
+environ = os.environ.copy()
+
+
+def AssertEq(expected, actual):
+ if expected != actual:
+ print 'Expected: %s' % (expected,)
+ print ' Actual: %s' % (actual,)
+ raise AssertionError
+
+
+def SetEnvVar(env_var, value):
+ """Sets the env variable to 'value'; unsets it when 'value' is None."""
+
+ if value is not None:
+ environ[env_var] = value
+ elif env_var in environ:
+ del environ[env_var]
+
+
+def GetFlag(flag):
+ """Runs googletest-env-var-test_ and returns its output."""
+
+ args = [COMMAND]
+ if flag is not None:
+ args += [flag]
+ return gtest_test_utils.Subprocess(args, env=environ).output
+
+
+def TestFlag(flag, test_val, default_val):
+ """Verifies that the given flag is affected by the corresponding env var."""
+
+ env_var = 'GTEST_' + flag.upper()
+ SetEnvVar(env_var, test_val)
+ AssertEq(test_val, GetFlag(flag))
+ SetEnvVar(env_var, None)
+ AssertEq(default_val, GetFlag(flag))
+
+
+class GTestEnvVarTest(gtest_test_utils.TestCase):
+
+ def testEnvVarAffectsFlag(self):
+ """Tests that environment variable should affect the corresponding flag."""
+
+ TestFlag('break_on_failure', '1', '0')
+ TestFlag('color', 'yes', 'auto')
+ TestFlag('filter', 'FooTest.Bar', '*')
+ SetEnvVar('XML_OUTPUT_FILE', None) # For 'output' test
+ TestFlag('output', 'xml:tmp/foo.xml', '')
+ TestFlag('print_time', '0', '1')
+ TestFlag('repeat', '999', '1')
+ TestFlag('throw_on_failure', '1', '0')
+ TestFlag('death_test_style', 'threadsafe', 'fast')
+ TestFlag('catch_exceptions', '0', '1')
+
+ if IS_LINUX:
+ TestFlag('death_test_use_fork', '1', '0')
+ TestFlag('stack_trace_depth', '0', '100')
+
+
+ def testXmlOutputFile(self):
+ """Tests that $XML_OUTPUT_FILE affects the output flag."""
+
+ SetEnvVar('GTEST_OUTPUT', None)
+ SetEnvVar('XML_OUTPUT_FILE', 'tmp/bar.xml')
+ AssertEq('xml:tmp/bar.xml', GetFlag('output'))
+
+ def testXmlOutputFileOverride(self):
+ """Tests that $XML_OUTPUT_FILE is overridden by $GTEST_OUTPUT."""
+
+ SetEnvVar('GTEST_OUTPUT', 'xml:tmp/foo.xml')
+ SetEnvVar('XML_OUTPUT_FILE', 'tmp/bar.xml')
+ AssertEq('xml:tmp/foo.xml', GetFlag('output'))
+
+if __name__ == '__main__':
+ gtest_test_utils.Main()