1 # Copyright 2006, Google Inc.
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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
37 IS_WINDOWS = os.name == 'nt'
38 IS_CYGWIN = os.name == 'posix' and 'CYGWIN' in os.uname()[0]
39 IS_OS2 = os.name == 'os2'
44 import unittest as _test_module
48 _SUBPROCESS_MODULE_AVAILABLE = True
51 _SUBPROCESS_MODULE_AVAILABLE = False
52 # pylint: enable-msg=C6204
54 GTEST_OUTPUT_VAR_NAME = 'GTEST_OUTPUT'
56 # The environment variable for specifying the path to the premature-exit file.
57 PREMATURE_EXIT_FILE_ENV_VAR = 'TEST_PREMATURE_EXIT_FILE'
59 environ = os.environ.copy()
62 def SetEnvVar(env_var, value):
63 """Sets/unsets an environment variable to a given value."""
66 environ[env_var] = value
67 elif env_var in environ:
71 # Here we expose a class from a particular module, depending on the
72 # environment. The comment suppresses the 'Invalid variable name' lint
74 TestCase = _test_module.TestCase # pylint: disable=C6409
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
83 def _ParseAndStripGTestFlags(argv):
84 """Parses and strips Google Test flags from argv. This is idempotent."""
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:
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()]
98 # The command line flag overrides the environment variable.
99 i = 1 # Skips the program name.
101 prefix = '--' + flag + '='
102 if argv[i].startswith(prefix):
103 _flag_map[flag] = argv[i][len(prefix):]
107 # We don't increment i in case we just found a --gtest_* flag
108 # and removed it from argv.
113 """Returns the value of the given flag."""
115 # In case GetFlag() is called before Main(), we always call
116 # _ParseAndStripGTestFlags() here to make sure the --gtest_* flags
118 _ParseAndStripGTestFlags(sys.argv)
120 return _flag_map[flag]
124 """Returns the absolute path of the directory where the .py files are."""
126 return os.path.abspath(GetFlag('source_dir'))
130 """Returns the absolute path of the directory where the test binaries are."""
132 return os.path.abspath(GetFlag('build_dir'))
137 def _RemoveTempDir():
139 shutil.rmtree(_temp_dir, ignore_errors=True)
141 atexit.register(_RemoveTempDir)
147 _temp_dir = tempfile.mkdtemp()
151 def GetTestExecutablePath(executable_name, build_dir=None):
152 """Returns the absolute path of the test binary given its name.
154 The function will print a message and abort the program if the resulting file
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().
163 The absolute path of the test binary.
166 path = os.path.abspath(os.path.join(build_dir or GetBuildDir(),
168 if (IS_WINDOWS or IS_CYGWIN or IS_OS2) and not path.endswith('.exe'):
171 if not os.path.exists(path):
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
182 def GetExitStatus(exit_code):
183 """Returns the argument to exit(), or -1 if exit() wasn't called.
186 exit_code: the result value of os.system(command).
190 # On Windows, os.WEXITSTATUS() doesn't work and os.system() returns
191 # the argument to exit() directly.
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)
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.
206 Restores the old directory afterwards.
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
213 env: Dictionary with environment to pass to the subprocess.
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 exited True if and only if the child process exited
222 exit_code The code with which the child process exited.
223 output Child process's stdout and stderr output
224 combined in a string.
227 # The subprocess module is the preferrable way of running programs
228 # since it is available and behaves consistently on all platforms,
229 # including Windows. But it is only available starting in python 2.4.
230 # In earlier python versions, we revert to the popen2 module, which is
231 # available in python 2.0 and later but doesn't provide required
232 # functionality (Popen4) under Windows. This allows us to support Mac
233 # OS X 10.4 Tiger, which has python 2.3 installed.
234 if _SUBPROCESS_MODULE_AVAILABLE:
236 stderr = subprocess.STDOUT
238 stderr = subprocess.PIPE
240 p = subprocess.Popen(command,
241 stdout=subprocess.PIPE, stderr=stderr,
242 cwd=working_dir, universal_newlines=True, env=env)
243 # communicate returns a tuple with the file object for the child's
245 self.output = p.communicate()[0]
246 self._return_code = p.returncode
248 old_dir = os.getcwd()
250 def _ReplaceEnvDict(dest, src):
251 # Changes made by os.environ.clear are not inheritable by child
252 # processes until Python 2.6. To produce inheritable changes we have
253 # to delete environment items with the del statement.
254 for key in dest.keys():
258 # When 'env' is not None, backup the environment variables and replace
259 # them with the passed 'env'. When 'env' is None, we simply use the
260 # current 'os.environ' for compatibility with the subprocess.Popen
261 # semantics used above.
263 old_environ = os.environ.copy()
264 _ReplaceEnvDict(os.environ, env)
267 if working_dir is not None:
268 os.chdir(working_dir)
270 p = popen2.Popen4(command)
272 p = popen2.Popen3(command)
274 self.output = p.fromchild.read()
279 # Restore the old environment variables
280 # if they were replaced.
282 _ReplaceEnvDict(os.environ, old_environ)
284 # Converts ret_code to match the semantics of
285 # subprocess.Popen.returncode.
286 if os.WIFSIGNALED(ret_code):
287 self._return_code = -os.WTERMSIG(ret_code)
288 else: # os.WIFEXITED(ret_code) should return True here.
289 self._return_code = os.WEXITSTATUS(ret_code)
291 if bool(self._return_code & 0x80000000):
292 self.terminated_by_signal = True
295 self.terminated_by_signal = False
297 self.exit_code = self._return_code
301 """Runs the unit test."""
303 # We must call _ParseAndStripGTestFlags() before calling
304 # unittest.main(). Otherwise the latter will be confused by the
306 _ParseAndStripGTestFlags(sys.argv)
307 # The tested binaries should not be writing XML output files unless the
308 # script explicitly instructs them to.
309 if GTEST_OUTPUT_VAR_NAME in os.environ:
310 del os.environ[GTEST_OUTPUT_VAR_NAME]