summaryrefslogtreecommitdiffstats
path: root/googletest/test/gtest_test_utils.py
blob: 964fa9fa50d438c26d7737557c9184c2a80c90b3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
# 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=g-import-not-at-top

import os
import subprocess
import sys

IS_WINDOWS = os.name == 'nt'
IS_CYGWIN = os.name == 'posix' and 'CYGWIN' in os.uname()[0]
IS_OS2 = os.name == 'os2'

import atexit
import shutil
import tempfile
import unittest as _test_module
# pylint: enable=g-import-not-at-top

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.
TestCase = _test_module.TestCase

# 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."""

  global _gtest_flags_are_parsed
  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 or IS_OS2) 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(message, file=sys.stderr)
    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 if and only if the child process has been
                               terminated by a signal.
        exited                 True if and only if 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.
    """

    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

    if bool(self._return_code & 0x80000000):
      self.terminated_by_signal = True
      self.exited = False
    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.
  if GTEST_OUTPUT_VAR_NAME in os.environ:
    del os.environ[GTEST_OUTPUT_VAR_NAME]

  _test_module.main()