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R9484/googletest/test/gtest_test_utils.py
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gtest_test_utils.py
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# Copyright 2006, 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.
"""Unit test utilities for Google C++ Testing Framework."""
# Suppresses the 'Import not at the top of the file' lint complaint.
# pylint: disable-msg=C6204
__author__ = 'wan@google.com (Zhanyong Wan)'
import os
import sys
IS_LINUX = os.name == 'posix' and os.uname()[0] == 'Linux'
IS_WINDOWS = os.name == 'nt'
IS_CYGWIN = os.name == 'posix' and 'CYGWIN' in os.uname()[0]
import atexit
import shutil
import tempfile
import unittest
_test_module = unittest
try:
import subprocess
_SUBPROCESS_MODULE_AVAILABLE = True
except:
import popen2
_SUBPROCESS_MODULE_AVAILABLE = False
# pylint: enable-msg=C6204
GTEST_OUTPUT_VAR_NAME = 'GTEST_OUTPUT'
# The environment variable for specifying the path to the premature-exit file.
PREMATURE_EXIT_FILE_ENV_VAR = 'TEST_PREMATURE_EXIT_FILE'
environ = os.environ.copy()
def SetEnvVar(env_var, value):
"""Sets/unsets an environment variable to a given value."""
if value is not None:
environ[env_var] = value
elif env_var in environ:
del environ[env_var]
# Here we expose a class from a particular module, depending on the
# environment. The comment suppresses the 'Invalid variable name' lint
# complaint.
TestCase = _test_module.TestCase # pylint: disable-msg=C6409
# Initially maps a flag to its default value. After
# _ParseAndStripGTestFlags() is called, maps a flag to its actual value.
_flag_map = {'source_dir': os.path.dirname(sys.argv[0]),
'build_dir': os.path.dirname(sys.argv[0])}
_gtest_flags_are_parsed = False
def _ParseAndStripGTestFlags(argv):
"""Parses and strips Google Test flags from argv. This is idempotent."""
# Suppresses the lint complaint about a global variable since we need it
# here to maintain module-wide state.
global _gtest_flags_are_parsed # pylint: disable-msg=W0603
if _gtest_flags_are_parsed:
return
_gtest_flags_are_parsed = True
for flag in _flag_map:
# The environment variable overrides the default value.
if flag.upper() in os.environ:
_flag_map[flag] = os.environ[flag.upper()]
# The command line flag overrides the environment variable.
i = 1 # Skips the program name.
while i < len(argv):
prefix = '--' + flag + '='
if argv[i].startswith(prefix):
_flag_map[flag] = argv[i][len(prefix):]
del argv[i]
break
else:
# We don't increment i in case we just found a --gtest_* flag
# and removed it from argv.
i += 1
def GetFlag(flag):
"""Returns the value of the given flag."""
# In case GetFlag() is called before Main(), we always call
# _ParseAndStripGTestFlags() here to make sure the --gtest_* flags
# are parsed.
_ParseAndStripGTestFlags(sys.argv)
return _flag_map[flag]
def GetSourceDir():
"""Returns the absolute path of the directory where the .py files are."""
return os.path.abspath(GetFlag('source_dir'))
def GetBuildDir():
"""Returns the absolute path of the directory where the test binaries are."""
return os.path.abspath(GetFlag('build_dir'))
_temp_dir = None
def _RemoveTempDir():
if _temp_dir:
shutil.rmtree(_temp_dir, ignore_errors=True)
atexit.register(_RemoveTempDir)
def GetTempDir():
global _temp_dir
if not _temp_dir:
_temp_dir = tempfile.mkdtemp()
return _temp_dir
def GetTestExecutablePath(executable_name, build_dir=None):
"""Returns the absolute path of the test binary given its name.
The function will print a message and abort the program if the resulting file
doesn't exist.
Args:
executable_name: name of the test binary that the test script runs.
build_dir: directory where to look for executables, by default
the result of GetBuildDir().
Returns:
The absolute path of the test binary.
"""
path = os.path.abspath(os.path.join(build_dir or GetBuildDir(),
executable_name))
if (IS_WINDOWS or IS_CYGWIN) and not path.endswith('.exe'):
path += '.exe'
if not os.path.exists(path):
message = (
'Unable to find the test binary "%s". Please make sure to provide\n'
'a path to the binary via the --build_dir flag or the BUILD_DIR\n'
'environment variable.' % path)
print >> sys.stderr, message
sys.exit(1)
return path
def GetExitStatus(exit_code):
"""Returns the argument to exit(), or -1 if exit() wasn't called.
Args:
exit_code: the result value of os.system(command).
"""
if os.name == 'nt':
# On Windows, os.WEXITSTATUS() doesn't work and os.system() returns
# the argument to exit() directly.
return exit_code
else:
# On Unix, os.WEXITSTATUS() must be used to extract the exit status
# from the result of os.system().
if os.WIFEXITED(exit_code):
return os.WEXITSTATUS(exit_code)
else:
return -1
class Subprocess:
def __init__(self, command, working_dir=None, capture_stderr=True, env=None):
"""Changes into a specified directory, if provided, and executes a command.
Restores the old directory afterwards.
Args:
command: The command to run, in the form of sys.argv.
working_dir: The directory to change into.
capture_stderr: Determines whether to capture stderr in the output member
or to discard it.
env: Dictionary with environment to pass to the subprocess.
Returns:
An object that represents outcome of the executed process. It has the
following attributes:
terminated_by_signal True iff the child process has been terminated
by a signal.
signal Sygnal that terminated the child process.
exited True iff the child process exited normally.
exit_code The code with which the child process exited.
output Child process's stdout and stderr output
combined in a string.
"""
# The subprocess module is the preferable way of running programs
# since it is available and behaves consistently on all platforms,
# including Windows. But it is only available starting in python 2.4.
# In earlier python versions, we revert to the popen2 module, which is
# available in python 2.0 and later but doesn't provide required
# functionality (Popen4) under Windows. This allows us to support Mac
# OS X 10.4 Tiger, which has python 2.3 installed.
if _SUBPROCESS_MODULE_AVAILABLE:
if capture_stderr:
stderr = subprocess.STDOUT
else:
stderr = subprocess.PIPE
p = subprocess.Popen(command,
stdout=subprocess.PIPE, stderr=stderr,
cwd=working_dir, universal_newlines=True, env=env)
# communicate returns a tuple with the file object for the child's
# output.
self.output = p.communicate()[0]
self._return_code = p.returncode
else:
old_dir = os.getcwd()
def _ReplaceEnvDict(dest, src):
# Changes made by os.environ.clear are not inheritable by child
# processes until Python 2.6. To produce inheritable changes we have
# to delete environment items with the del statement.
for key in dest.keys():
del dest[key]
dest.update(src)
# When 'env' is not None, backup the environment variables and replace
# them with the passed 'env'. When 'env' is None, we simply use the
# current 'os.environ' for compatibility with the subprocess.Popen
# semantics used above.
if env is not None:
old_environ = os.environ.copy()
_ReplaceEnvDict(os.environ, env)
try:
if working_dir is not None:
os.chdir(working_dir)
if capture_stderr:
p = popen2.Popen4(command)
else:
p = popen2.Popen3(command)
p.tochild.close()
self.output = p.fromchild.read()
ret_code = p.wait()
finally:
os.chdir(old_dir)
# Restore the old environment variables
# if they were replaced.
if env is not None:
_ReplaceEnvDict(os.environ, old_environ)
# Converts ret_code to match the semantics of
# subprocess.Popen.returncode.
if os.WIFSIGNALED(ret_code):
self._return_code = -os.WTERMSIG(ret_code)
else: # os.WIFEXITED(ret_code) should return True here.
self._return_code = os.WEXITSTATUS(ret_code)
if self._return_code < 0:
self.terminated_by_signal = True
self.exited = False
self.signal = -self._return_code
else:
self.terminated_by_signal = False
self.exited = True
self.exit_code = self._return_code
def Main():
"""Runs the unit test."""
# We must call _ParseAndStripGTestFlags() before calling
# unittest.main(). Otherwise the latter will be confused by the
# --gtest_* flags.
_ParseAndStripGTestFlags(sys.argv)
# The tested binaries should not be writing XML output files unless the
# script explicitly instructs them to.
# TODO(vladl@google.com): Move this into Subprocess when we implement
# passing environment into it as a parameter.
if GTEST_OUTPUT_VAR_NAME in os.environ:
del os.environ[GTEST_OUTPUT_VAR_NAME]
_test_module.main()
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