Source/ThirdParty/gtest/test/gtest_test_utils.py - WebKit - Git at Google

 # 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 and Mocking Framework."""
 # Suppresses the 'Import not at the top of the file' lint complaint.
 # pylint: disable-msg=C6204

 import os
 import sys

 IS_WINDOWS = os.name == 'nt'
 IS_CYGWIN = os.name == 'posix' and 'CYGWIN' in os.uname()[0]

 import atexit
 import shutil
 import tempfile
 import unittest as _test_module

 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=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=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 preferrable 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.
   # FIXME: 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()
	# 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 and Mocking Framework."""
	# Suppresses the 'Import not at the top of the file' lint complaint.
	# pylint: disable-msg=C6204

	import os
	import sys

	IS_WINDOWS = os.name == 'nt'
	IS_CYGWIN = os.name == 'posix' and 'CYGWIN' in os.uname()[0]

	import atexit
	import shutil
	import tempfile
	import unittest as _test_module

	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=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=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 preferrable 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.
	# FIXME: 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()