3 # Copyright 2006, Google Inc.
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18 # this software without specific prior written permission.
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32 """Unit test utilities for Google C++ Testing Framework."""
34 __author__ = 'wan@google.com (Zhanyong Wan)'
42 _test_module = unittest
44 # Suppresses the 'Import not at the top of the file' lint complaint.
45 # pylint: disable-msg=C6204
48 _SUBPROCESS_MODULE_AVAILABLE = True
51 _SUBPROCESS_MODULE_AVAILABLE = False
52 # pylint: enable-msg=C6204
54 GTEST_OUTPUT_VAR_NAME = 'GTEST_OUTPUT'
56 IS_WINDOWS = os.name == 'nt'
57 IS_CYGWIN = os.name == 'posix' and 'CYGWIN' in os.uname()[0]
59 # Here we expose a class from a particular module, depending on the
60 # environment. The comment suppresses the 'Invalid variable name' lint
62 TestCase = _test_module.TestCase # pylint: disable-msg=C6409
64 # Initially maps a flag to its default value. After
65 # _ParseAndStripGTestFlags() is called, maps a flag to its actual value.
66 _flag_map = {'gtest_source_dir': os.path.dirname(sys.argv[0]),
67 'gtest_build_dir': os.path.dirname(sys.argv[0])}
68 _gtest_flags_are_parsed = False
71 def _ParseAndStripGTestFlags(argv):
72 """Parses and strips Google Test flags from argv. This is idempotent."""
74 # Suppresses the lint complaint about a global variable since we need it
75 # here to maintain module-wide state.
76 global _gtest_flags_are_parsed # pylint: disable-msg=W0603
77 if _gtest_flags_are_parsed:
80 _gtest_flags_are_parsed = True
81 for flag in _flag_map:
82 # The environment variable overrides the default value.
83 if flag.upper() in os.environ:
84 _flag_map[flag] = os.environ[flag.upper()]
86 # The command line flag overrides the environment variable.
87 i = 1 # Skips the program name.
89 prefix = '--' + flag + '='
90 if argv[i].startswith(prefix):
91 _flag_map[flag] = argv[i][len(prefix):]
95 # We don't increment i in case we just found a --gtest_* flag
96 # and removed it from argv.
101 """Returns the value of the given flag."""
103 # In case GetFlag() is called before Main(), we always call
104 # _ParseAndStripGTestFlags() here to make sure the --gtest_* flags
106 _ParseAndStripGTestFlags(sys.argv)
108 return _flag_map[flag]
112 """Returns the absolute path of the directory where the .py files are."""
114 return os.path.abspath(GetFlag('gtest_source_dir'))
118 """Returns the absolute path of the directory where the test binaries are."""
120 return os.path.abspath(GetFlag('gtest_build_dir'))
125 def _RemoveTempDir():
127 shutil.rmtree(_temp_dir, ignore_errors=True)
129 atexit.register(_RemoveTempDir)
133 """Returns a directory for temporary files."""
137 _temp_dir = tempfile.mkdtemp()
141 def GetTestExecutablePath(executable_name, build_dir=None):
142 """Returns the absolute path of the test binary given its name.
144 The function will print a message and abort the program if the resulting file
148 executable_name: name of the test binary that the test script runs.
149 build_dir: directory where to look for executables, by default
150 the result of GetBuildDir().
153 The absolute path of the test binary.
156 path = os.path.abspath(os.path.join(build_dir or GetBuildDir(),
158 if (IS_WINDOWS or IS_CYGWIN) and not path.endswith('.exe'):
161 if not os.path.exists(path):
163 'Unable to find the test binary. Please make sure to provide path\n'
164 'to the binary via the --gtest_build_dir flag or the GTEST_BUILD_DIR\n'
165 'environment variable. For convenient use, invoke this script via\n'
167 # TODO(vladl@google.com): change mk_test.py to test.py after renaming
169 'Please run mk_test.py -h for help.')
170 print >> sys.stderr, message
176 def GetExitStatus(exit_code):
177 """Returns the argument to exit(), or -1 if exit() wasn't called.
180 exit_code: the result value of os.system(command).
184 # On Windows, os.WEXITSTATUS() doesn't work and os.system() returns
185 # the argument to exit() directly.
188 # On Unix, os.WEXITSTATUS() must be used to extract the exit status
189 # from the result of os.system().
190 if os.WIFEXITED(exit_code):
191 return os.WEXITSTATUS(exit_code)
197 def __init__(self, command, working_dir=None, capture_stderr=True, env=None):
198 """Changes into a specified directory, if provided, and executes a command.
200 Restores the old directory afterwards.
203 command: The command to run, in the form of sys.argv.
204 working_dir: The directory to change into.
205 capture_stderr: Determines whether to capture stderr in the output member
207 env: Dictionary with environment to pass to the subprocess.
210 An object that represents outcome of the executed process. It has the
211 following attributes:
212 terminated_by_signal True iff the child process has been terminated
214 signal Sygnal that terminated the child process.
215 exited True iff the child process exited normally.
216 exit_code The code with which the child process exited.
217 output Child process's stdout and stderr output
218 combined in a string.
221 # The subprocess module is the preferrable way of running programs
222 # since it is available and behaves consistently on all platforms,
223 # including Windows. But it is only available starting in python 2.4.
224 # In earlier python versions, we revert to the popen2 module, which is
225 # available in python 2.0 and later but doesn't provide required
226 # functionality (Popen4) under Windows. This allows us to support Mac
227 # OS X 10.4 Tiger, which has python 2.3 installed.
228 if _SUBPROCESS_MODULE_AVAILABLE:
230 stderr = subprocess.STDOUT
232 stderr = subprocess.PIPE
234 p = subprocess.Popen(command,
235 stdout=subprocess.PIPE, stderr=stderr,
236 cwd=working_dir, universal_newlines=True, env=env)
237 # communicate returns a tuple with the file obect for the child's
239 self.output = p.communicate()[0]
240 self._return_code = p.returncode
242 old_dir = os.getcwd()
244 def _ReplaceEnvDict(dest, src):
245 # Changes made by os.environ.clear are not inheritable by child
246 # processes until Python 2.6. To produce inheritable changes we have
247 # to delete environment items with the del statement.
252 # When 'env' is not None, backup the environment variables and replace
253 # them with the passed 'env'. When 'env' is None, we simply use the
254 # current 'os.environ' for compatibility with the subprocess.Popen
255 # semantics used above.
257 old_environ = os.environ.copy()
258 _ReplaceEnvDict(os.environ, env)
261 if working_dir is not None:
262 os.chdir(working_dir)
264 p = popen2.Popen4(command)
266 p = popen2.Popen3(command)
268 self.output = p.fromchild.read()
273 # Restore the old environment variables
274 # if they were replaced.
276 _ReplaceEnvDict(os.environ, old_environ)
278 # Converts ret_code to match the semantics of
279 # subprocess.Popen.returncode.
280 if os.WIFSIGNALED(ret_code):
281 self._return_code = -os.WTERMSIG(ret_code)
282 else: # os.WIFEXITED(ret_code) should return True here.
283 self._return_code = os.WEXITSTATUS(ret_code)
285 if self._return_code < 0:
286 self.terminated_by_signal = True
288 self.signal = -self._return_code
290 self.terminated_by_signal = False
292 self.exit_code = self._return_code
296 """Runs the unit test."""
298 # We must call _ParseAndStripGTestFlags() before calling
299 # unittest.main(). Otherwise the latter will be confused by the
301 _ParseAndStripGTestFlags(sys.argv)
302 # The tested binaries should not be writing XML output files unless the
303 # script explicitly instructs them to.
304 # TODO(vladl@google.com): Move this into Subprocess when we implement
305 # passing environment into it as a parameter.
306 if GTEST_OUTPUT_VAR_NAME in os.environ:
307 del os.environ[GTEST_OUTPUT_VAR_NAME]