ceph/src/googletest/googletest/test/gtest_test_utils.py

   1 # Copyright 2006, Google Inc.
   2 # All rights reserved.
   3 #
   4 # Redistribution and use in source and binary forms, with or without
   5 # modification, are permitted provided that the following conditions are
   6 # met:
   7 #
   8 #     * Redistributions of source code must retain the above copyright
   9 # notice, this list of conditions and the following disclaimer.
  10 #     * Redistributions in binary form must reproduce the above
  11 # copyright notice, this list of conditions and the following disclaimer
  12 # in the documentation and/or other materials provided with the
  13 # distribution.
  14 #     * Neither the name of Google Inc. nor the names of its
  15 # contributors may be used to endorse or promote products derived from
  16 # this software without specific prior written permission.
  17 #
  18 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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  21 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  22 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  23 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  24 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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  28 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29
  30 """Unit test utilities for Google C++ Testing and Mocking Framework."""
  31 # Suppresses the 'Import not at the top of the file' lint complaint.
  32 # pylint: disable-msg=C6204
  33
  34 import os
  35 import sys
  36
  37 IS_WINDOWS = os.name == 'nt'
  38 IS_CYGWIN = os.name == 'posix' and 'CYGWIN' in os.uname()[0]
  39 IS_OS2 = os.name == 'os2'
  40
  41 import atexit
  42 import shutil
  43 import tempfile
  44 import unittest as _test_module
  45
  46 try:
  47   import subprocess
  48   _SUBPROCESS_MODULE_AVAILABLE = True
  49 except:
  50   import popen2
  51   _SUBPROCESS_MODULE_AVAILABLE = False
  52 # pylint: enable-msg=C6204
  53
  54 GTEST_OUTPUT_VAR_NAME = 'GTEST_OUTPUT'
  55
  56 # The environment variable for specifying the path to the premature-exit file.
  57 PREMATURE_EXIT_FILE_ENV_VAR = 'TEST_PREMATURE_EXIT_FILE'
  58
  59 environ = os.environ.copy()
  60
  61
  62 def SetEnvVar(env_var, value):
  63   """Sets/unsets an environment variable to a given value."""
  64
  65   if value is not None:
  66     environ[env_var] = value
  67   elif env_var in environ:
  68     del environ[env_var]
  69
  70
  71 # Here we expose a class from a particular module, depending on the
  72 # environment. The comment suppresses the 'Invalid variable name' lint
  73 # complaint.
  74 TestCase = _test_module.TestCase  # pylint: disable=C6409
  75
  76 # Initially maps a flag to its default value. After
  77 # _ParseAndStripGTestFlags() is called, maps a flag to its actual value.
  78 _flag_map = {'source_dir': os.path.dirname(sys.argv[0]),
  79              'build_dir': os.path.dirname(sys.argv[0])}
  80 _gtest_flags_are_parsed = False
  81
  82
  83 def _ParseAndStripGTestFlags(argv):
  84   """Parses and strips Google Test flags from argv.  This is idempotent."""
  85
  86   # Suppresses the lint complaint about a global variable since we need it
  87   # here to maintain module-wide state.
  88   global _gtest_flags_are_parsed  # pylint: disable=W0603
  89   if _gtest_flags_are_parsed:
  90     return
  91
  92   _gtest_flags_are_parsed = True
  93   for flag in _flag_map:
  94     # The environment variable overrides the default value.
  95     if flag.upper() in os.environ:
  96       _flag_map[flag] = os.environ[flag.upper()]
  97
  98     # The command line flag overrides the environment variable.
  99     i = 1  # Skips the program name.
 100     while i < len(argv):
 101       prefix = '--' + flag + '='
 102       if argv[i].startswith(prefix):
 103         _flag_map[flag] = argv[i][len(prefix):]
 104         del argv[i]
 105         break
 106       else:
 107         # We don't increment i in case we just found a --gtest_* flag
 108         # and removed it from argv.
 109         i += 1
 110
 111
 112 def GetFlag(flag):
 113   """Returns the value of the given flag."""
 114
 115   # In case GetFlag() is called before Main(), we always call
 116   # _ParseAndStripGTestFlags() here to make sure the --gtest_* flags
 117   # are parsed.
 118   _ParseAndStripGTestFlags(sys.argv)
 119
 120   return _flag_map[flag]
 121
 122
 123 def GetSourceDir():
 124   """Returns the absolute path of the directory where the .py files are."""
 125
 126   return os.path.abspath(GetFlag('source_dir'))
 127
 128
 129 def GetBuildDir():
 130   """Returns the absolute path of the directory where the test binaries are."""
 131
 132   return os.path.abspath(GetFlag('build_dir'))
 133
 134
 135 _temp_dir = None
 136
 137 def _RemoveTempDir():
 138   if _temp_dir:
 139     shutil.rmtree(_temp_dir, ignore_errors=True)
 140
 141 atexit.register(_RemoveTempDir)
 142
 143
 144 def GetTempDir():
 145   global _temp_dir
 146   if not _temp_dir:
 147     _temp_dir = tempfile.mkdtemp()
 148   return _temp_dir
 149
 150
 151 def GetTestExecutablePath(executable_name, build_dir=None):
 152   """Returns the absolute path of the test binary given its name.
 153
 154   The function will print a message and abort the program if the resulting file
 155   doesn't exist.
 156
 157   Args:
 158     executable_name: name of the test binary that the test script runs.
 159     build_dir:       directory where to look for executables, by default
 160                      the result of GetBuildDir().
 161
 162   Returns:
 163     The absolute path of the test binary.
 164   """
 165
 166   path = os.path.abspath(os.path.join(build_dir or GetBuildDir(),
 167                                       executable_name))
 168   if (IS_WINDOWS or IS_CYGWIN or IS_OS2) and not path.endswith('.exe'):
 169     path += '.exe'
 170
 171   if not os.path.exists(path):
 172     message = (
 173         'Unable to find the test binary "%s". Please make sure to provide\n'
 174         'a path to the binary via the --build_dir flag or the BUILD_DIR\n'
 175         'environment variable.' % path)
 176     print >> sys.stderr, message
 177     sys.exit(1)
 178
 179   return path
 180
 181
 182 def GetExitStatus(exit_code):
 183   """Returns the argument to exit(), or -1 if exit() wasn't called.
 184
 185   Args:
 186     exit_code: the result value of os.system(command).
 187   """
 188
 189   if os.name == 'nt':
 190     # On Windows, os.WEXITSTATUS() doesn't work and os.system() returns
 191     # the argument to exit() directly.
 192     return exit_code
 193   else:
 194     # On Unix, os.WEXITSTATUS() must be used to extract the exit status
 195     # from the result of os.system().
 196     if os.WIFEXITED(exit_code):
 197       return os.WEXITSTATUS(exit_code)
 198     else:
 199       return -1
 200
 201
 202 class Subprocess:
 203   def __init__(self, command, working_dir=None, capture_stderr=True, env=None):
 204     """Changes into a specified directory, if provided, and executes a command.
 205
 206     Restores the old directory afterwards.
 207
 208     Args:
 209       command:        The command to run, in the form of sys.argv.
 210       working_dir:    The directory to change into.
 211       capture_stderr: Determines whether to capture stderr in the output member
 212                       or to discard it.
 213       env:            Dictionary with environment to pass to the subprocess.
 214
 215     Returns:
 216       An object that represents outcome of the executed process. It has the
 217       following attributes:
 218         terminated_by_signal   True if and only if the child process has been
 219                                terminated by a signal.
 220         signal                 Sygnal that terminated the child process.
 221         exited                 True if and only if the child process exited
 222                                normally.
 223         exit_code              The code with which the child process exited.
 224         output                 Child process's stdout and stderr output
 225                                combined in a string.
 226     """
 227
 228     # The subprocess module is the preferrable way of running programs
 229     # since it is available and behaves consistently on all platforms,
 230     # including Windows. But it is only available starting in python 2.4.
 231     # In earlier python versions, we revert to the popen2 module, which is
 232     # available in python 2.0 and later but doesn't provide required
 233     # functionality (Popen4) under Windows. This allows us to support Mac
 234     # OS X 10.4 Tiger, which has python 2.3 installed.
 235     if _SUBPROCESS_MODULE_AVAILABLE:
 236       if capture_stderr:
 237         stderr = subprocess.STDOUT
 238       else:
 239         stderr = subprocess.PIPE
 240
 241       p = subprocess.Popen(command,
 242                            stdout=subprocess.PIPE, stderr=stderr,
 243                            cwd=working_dir, universal_newlines=True, env=env)
 244       # communicate returns a tuple with the file object for the child's
 245       # output.
 246       self.output = p.communicate()[0]
 247       self._return_code = p.returncode
 248     else:
 249       old_dir = os.getcwd()
 250
 251       def _ReplaceEnvDict(dest, src):
 252         # Changes made by os.environ.clear are not inheritable by child
 253         # processes until Python 2.6. To produce inheritable changes we have
 254         # to delete environment items with the del statement.
 255         for key in dest.keys():
 256           del dest[key]
 257         dest.update(src)
 258
 259       # When 'env' is not None, backup the environment variables and replace
 260       # them with the passed 'env'. When 'env' is None, we simply use the
 261       # current 'os.environ' for compatibility with the subprocess.Popen
 262       # semantics used above.
 263       if env is not None:
 264         old_environ = os.environ.copy()
 265         _ReplaceEnvDict(os.environ, env)
 266
 267       try:
 268         if working_dir is not None:
 269           os.chdir(working_dir)
 270         if capture_stderr:
 271           p = popen2.Popen4(command)
 272         else:
 273           p = popen2.Popen3(command)
 274         p.tochild.close()
 275         self.output = p.fromchild.read()
 276         ret_code = p.wait()
 277       finally:
 278         os.chdir(old_dir)
 279
 280         # Restore the old environment variables
 281         # if they were replaced.
 282         if env is not None:
 283           _ReplaceEnvDict(os.environ, old_environ)
 284
 285       # Converts ret_code to match the semantics of
 286       # subprocess.Popen.returncode.
 287       if os.WIFSIGNALED(ret_code):
 288         self._return_code = -os.WTERMSIG(ret_code)
 289       else:  # os.WIFEXITED(ret_code) should return True here.
 290         self._return_code = os.WEXITSTATUS(ret_code)
 291
 292     if self._return_code < 0:
 293       self.terminated_by_signal = True
 294       self.exited = False
 295       self.signal = -self._return_code
 296     else:
 297       self.terminated_by_signal = False
 298       self.exited = True
 299       self.exit_code = self._return_code
 300
 301
 302 def Main():
 303   """Runs the unit test."""
 304
 305   # We must call _ParseAndStripGTestFlags() before calling
 306   # unittest.main().  Otherwise the latter will be confused by the
 307   # --gtest_* flags.
 308   _ParseAndStripGTestFlags(sys.argv)
 309   # The tested binaries should not be writing XML output files unless the
 310   # script explicitly instructs them to.
 311   if GTEST_OUTPUT_VAR_NAME in os.environ:
 312     del os.environ[GTEST_OUTPUT_VAR_NAME]
 313
 314   _test_module.main()