1 #!/usr/bin/env python 2 # 3 # Copyright 2006, Google Inc. 4 # All rights reserved. 5 # 6 # Redistribution and use in source and binary forms, with or without 7 # modification, are permitted provided that the following conditions are 8 # met: 9 # 10 # * Redistributions of source code must retain the above copyright 11 # notice, this list of conditions and the following disclaimer. 12 # * Redistributions in binary form must reproduce the above 13 # copyright notice, this list of conditions and the following disclaimer 14 # in the documentation and/or other materials provided with the 15 # distribution. 16 # * Neither the name of Google Inc. nor the names of its 17 # contributors may be used to endorse or promote products derived from 18 # this software without specific prior written permission. 19 # 20 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 23 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 24 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 25 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 26 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 30 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 32 """Unit test utilities for Google C++ Testing Framework.""" 33 34 __author__ = 'wan (at] google.com (Zhanyong Wan)' 35 36 import atexit 37 import os 38 import shutil 39 import sys 40 import tempfile 41 import unittest 42 _test_module = unittest 43 44 # Suppresses the 'Import not at the top of the file' lint complaint. 45 # pylint: disable-msg=C6204 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 IS_WINDOWS = os.name == 'nt' 57 IS_CYGWIN = os.name == 'posix' and 'CYGWIN' in os.uname()[0] 58 59 # Here we expose a class from a particular module, depending on the 60 # environment. The comment suppresses the 'Invalid variable name' lint 61 # complaint. 62 TestCase = _test_module.TestCase # pylint: disable-msg=C6409 63 64 # Initially maps a flag to its default value. After 65 # _ParseAndStripGTestFlags() is called, maps a flag to its actual value. 66 _flag_map = {'source_dir': os.path.dirname(sys.argv[0]), 67 'build_dir': os.path.dirname(sys.argv[0])} 68 _gtest_flags_are_parsed = False 69 70 71 def _ParseAndStripGTestFlags(argv): 72 """Parses and strips Google Test flags from argv. This is idempotent.""" 73 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: 78 return 79 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()] 85 86 # The command line flag overrides the environment variable. 87 i = 1 # Skips the program name. 88 while i < len(argv): 89 prefix = '--' + flag + '=' 90 if argv[i].startswith(prefix): 91 _flag_map[flag] = argv[i][len(prefix):] 92 del argv[i] 93 break 94 else: 95 # We don't increment i in case we just found a --gtest_* flag 96 # and removed it from argv. 97 i += 1 98 99 100 def GetFlag(flag): 101 """Returns the value of the given flag.""" 102 103 # In case GetFlag() is called before Main(), we always call 104 # _ParseAndStripGTestFlags() here to make sure the --gtest_* flags 105 # are parsed. 106 _ParseAndStripGTestFlags(sys.argv) 107 108 return _flag_map[flag] 109 110 111 def GetSourceDir(): 112 """Returns the absolute path of the directory where the .py files are.""" 113 114 return os.path.abspath(GetFlag('source_dir')) 115 116 117 def GetBuildDir(): 118 """Returns the absolute path of the directory where the test binaries are.""" 119 120 return os.path.abspath(GetFlag('build_dir')) 121 122 123 _temp_dir = None 124 125 def _RemoveTempDir(): 126 if _temp_dir: 127 shutil.rmtree(_temp_dir, ignore_errors=True) 128 129 atexit.register(_RemoveTempDir) 130 131 132 def GetTempDir(): 133 """Returns a directory for temporary files.""" 134 135 global _temp_dir 136 if not _temp_dir: 137 _temp_dir = tempfile.mkdtemp() 138 return _temp_dir 139 140 141 def GetTestExecutablePath(executable_name, build_dir=None): 142 """Returns the absolute path of the test binary given its name. 143 144 The function will print a message and abort the program if the resulting file 145 doesn't exist. 146 147 Args: 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(). 151 152 Returns: 153 The absolute path of the test binary. 154 """ 155 156 path = os.path.abspath(os.path.join(build_dir or GetBuildDir(), 157 executable_name)) 158 if (IS_WINDOWS or IS_CYGWIN) and not path.endswith('.exe'): 159 path += '.exe' 160 161 if not os.path.exists(path): 162 message = ( 163 'Unable to find the test binary. Please make sure to provide path\n' 164 'to the binary via the --build_dir flag or the BUILD_DIR\n' 165 'environment variable.') 166 print >> sys.stderr, message 167 sys.exit(1) 168 169 return path 170 171 172 def GetExitStatus(exit_code): 173 """Returns the argument to exit(), or -1 if exit() wasn't called. 174 175 Args: 176 exit_code: the result value of os.system(command). 177 """ 178 179 if os.name == 'nt': 180 # On Windows, os.WEXITSTATUS() doesn't work and os.system() returns 181 # the argument to exit() directly. 182 return exit_code 183 else: 184 # On Unix, os.WEXITSTATUS() must be used to extract the exit status 185 # from the result of os.system(). 186 if os.WIFEXITED(exit_code): 187 return os.WEXITSTATUS(exit_code) 188 else: 189 return -1 190 191 192 class Subprocess: 193 def __init__(self, command, working_dir=None, capture_stderr=True, env=None): 194 """Changes into a specified directory, if provided, and executes a command. 195 196 Restores the old directory afterwards. 197 198 Args: 199 command: The command to run, in the form of sys.argv. 200 working_dir: The directory to change into. 201 capture_stderr: Determines whether to capture stderr in the output member 202 or to discard it. 203 env: Dictionary with environment to pass to the subprocess. 204 205 Returns: 206 An object that represents outcome of the executed process. It has the 207 following attributes: 208 terminated_by_signal True iff the child process has been terminated 209 by a signal. 210 signal Sygnal that terminated the child process. 211 exited True iff the child process exited normally. 212 exit_code The code with which the child process exited. 213 output Child process's stdout and stderr output 214 combined in a string. 215 """ 216 217 # The subprocess module is the preferrable way of running programs 218 # since it is available and behaves consistently on all platforms, 219 # including Windows. But it is only available starting in python 2.4. 220 # In earlier python versions, we revert to the popen2 module, which is 221 # available in python 2.0 and later but doesn't provide required 222 # functionality (Popen4) under Windows. This allows us to support Mac 223 # OS X 10.4 Tiger, which has python 2.3 installed. 224 if _SUBPROCESS_MODULE_AVAILABLE: 225 if capture_stderr: 226 stderr = subprocess.STDOUT 227 else: 228 stderr = subprocess.PIPE 229 230 p = subprocess.Popen(command, 231 stdout=subprocess.PIPE, stderr=stderr, 232 cwd=working_dir, universal_newlines=True, env=env) 233 # communicate returns a tuple with the file obect for the child's 234 # output. 235 self.output = p.communicate()[0] 236 self._return_code = p.returncode 237 else: 238 old_dir = os.getcwd() 239 240 def _ReplaceEnvDict(dest, src): 241 # Changes made by os.environ.clear are not inheritable by child 242 # processes until Python 2.6. To produce inheritable changes we have 243 # to delete environment items with the del statement. 244 for key in dest.keys(): 245 del dest[key] 246 dest.update(src) 247 248 # When 'env' is not None, backup the environment variables and replace 249 # them with the passed 'env'. When 'env' is None, we simply use the 250 # current 'os.environ' for compatibility with the subprocess.Popen 251 # semantics used above. 252 if env is not None: 253 old_environ = os.environ.copy() 254 _ReplaceEnvDict(os.environ, env) 255 256 try: 257 if working_dir is not None: 258 os.chdir(working_dir) 259 if capture_stderr: 260 p = popen2.Popen4(command) 261 else: 262 p = popen2.Popen3(command) 263 p.tochild.close() 264 self.output = p.fromchild.read() 265 ret_code = p.wait() 266 finally: 267 os.chdir(old_dir) 268 269 # Restore the old environment variables 270 # if they were replaced. 271 if env is not None: 272 _ReplaceEnvDict(os.environ, old_environ) 273 274 # Converts ret_code to match the semantics of 275 # subprocess.Popen.returncode. 276 if os.WIFSIGNALED(ret_code): 277 self._return_code = -os.WTERMSIG(ret_code) 278 else: # os.WIFEXITED(ret_code) should return True here. 279 self._return_code = os.WEXITSTATUS(ret_code) 280 281 if self._return_code < 0: 282 self.terminated_by_signal = True 283 self.exited = False 284 self.signal = -self._return_code 285 else: 286 self.terminated_by_signal = False 287 self.exited = True 288 self.exit_code = self._return_code 289 290 291 def Main(): 292 """Runs the unit test.""" 293 294 # We must call _ParseAndStripGTestFlags() before calling 295 # unittest.main(). Otherwise the latter will be confused by the 296 # --gtest_* flags. 297 _ParseAndStripGTestFlags(sys.argv) 298 # The tested binaries should not be writing XML output files unless the 299 # script explicitly instructs them to. 300 # TODO(vladl (at] google.com): Move this into Subprocess when we implement 301 # passing environment into it as a parameter. 302 if GTEST_OUTPUT_VAR_NAME in os.environ: 303 del os.environ[GTEST_OUTPUT_VAR_NAME] 304 305 _test_module.main() 306
