ceph/src/spawn/test/dependency/googletest/googletest/test/googletest-break-on-failure-unittest.py

   1 #!/usr/bin/env python
   2 #
   3 # Copyright 2006, Google Inc.
   4 # All rights reserved.
   5 #
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   7 # modification, are permitted provided that the following conditions are
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  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
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  15 # distribution.
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  17 # contributors may be used to endorse or promote products derived from
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  19 #
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  30 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31
  32 """Unit test for Google Test's break-on-failure mode.
  33
  34 A user can ask Google Test to seg-fault when an assertion fails, using
  35 either the GTEST_BREAK_ON_FAILURE environment variable or the
  36 --gtest_break_on_failure flag.  This script tests such functionality
  37 by invoking googletest-break-on-failure-unittest_ (a program written with
  38 Google Test) with different environments and command line flags.
  39 """
  40
  41 import os
  42 import gtest_test_utils
  43
  44 # Constants.
  45
  46 IS_WINDOWS = os.name == 'nt'
  47
  48 # The environment variable for enabling/disabling the break-on-failure mode.
  49 BREAK_ON_FAILURE_ENV_VAR = 'GTEST_BREAK_ON_FAILURE'
  50
  51 # The command line flag for enabling/disabling the break-on-failure mode.
  52 BREAK_ON_FAILURE_FLAG = 'gtest_break_on_failure'
  53
  54 # The environment variable for enabling/disabling the throw-on-failure mode.
  55 THROW_ON_FAILURE_ENV_VAR = 'GTEST_THROW_ON_FAILURE'
  56
  57 # The environment variable for enabling/disabling the catch-exceptions mode.
  58 CATCH_EXCEPTIONS_ENV_VAR = 'GTEST_CATCH_EXCEPTIONS'
  59
  60 # Path to the googletest-break-on-failure-unittest_ program.
  61 EXE_PATH = gtest_test_utils.GetTestExecutablePath(
  62     'googletest-break-on-failure-unittest_')
  63
  64
  65 environ = gtest_test_utils.environ
  66 SetEnvVar = gtest_test_utils.SetEnvVar
  67
  68 # Tests in this file run a Google-Test-based test program and expect it
  69 # to terminate prematurely.  Therefore they are incompatible with
  70 # the premature-exit-file protocol by design.  Unset the
  71 # premature-exit filepath to prevent Google Test from creating
  72 # the file.
  73 SetEnvVar(gtest_test_utils.PREMATURE_EXIT_FILE_ENV_VAR, None)
  74
  75
  76 def Run(command):
  77   """Runs a command; returns 1 if it was killed by a signal, or 0 otherwise."""
  78
  79   p = gtest_test_utils.Subprocess(command, env=environ)
  80   if p.terminated_by_signal:
  81     return 1
  82   else:
  83     return 0
  84
  85
  86 # The tests.
  87
  88
  89 class GTestBreakOnFailureUnitTest(gtest_test_utils.TestCase):
  90   """Tests using the GTEST_BREAK_ON_FAILURE environment variable or
  91   the --gtest_break_on_failure flag to turn assertion failures into
  92   segmentation faults.
  93   """
  94
  95   def RunAndVerify(self, env_var_value, flag_value, expect_seg_fault):
  96     """Runs googletest-break-on-failure-unittest_ and verifies that it does
  97     (or does not) have a seg-fault.
  98
  99     Args:
 100       env_var_value:    value of the GTEST_BREAK_ON_FAILURE environment
 101                         variable; None if the variable should be unset.
 102       flag_value:       value of the --gtest_break_on_failure flag;
 103                         None if the flag should not be present.
 104       expect_seg_fault: 1 if the program is expected to generate a seg-fault;
 105                         0 otherwise.
 106     """
 107
 108     SetEnvVar(BREAK_ON_FAILURE_ENV_VAR, env_var_value)
 109
 110     if env_var_value is None:
 111       env_var_value_msg = ' is not set'
 112     else:
 113       env_var_value_msg = '=' + env_var_value
 114
 115     if flag_value is None:
 116       flag = ''
 117     elif flag_value == '0':
 118       flag = '--%s=0' % BREAK_ON_FAILURE_FLAG
 119     else:
 120       flag = '--%s' % BREAK_ON_FAILURE_FLAG
 121
 122     command = [EXE_PATH]
 123     if flag:
 124       command.append(flag)
 125
 126     if expect_seg_fault:
 127       should_or_not = 'should'
 128     else:
 129       should_or_not = 'should not'
 130
 131     has_seg_fault = Run(command)
 132
 133     SetEnvVar(BREAK_ON_FAILURE_ENV_VAR, None)
 134
 135     msg = ('when %s%s, an assertion failure in "%s" %s cause a seg-fault.' %
 136            (BREAK_ON_FAILURE_ENV_VAR, env_var_value_msg, ' '.join(command),
 137             should_or_not))
 138     self.assert_(has_seg_fault == expect_seg_fault, msg)
 139
 140   def testDefaultBehavior(self):
 141     """Tests the behavior of the default mode."""
 142
 143     self.RunAndVerify(env_var_value=None,
 144                       flag_value=None,
 145                       expect_seg_fault=0)
 146
 147   def testEnvVar(self):
 148     """Tests using the GTEST_BREAK_ON_FAILURE environment variable."""
 149
 150     self.RunAndVerify(env_var_value='0',
 151                       flag_value=None,
 152                       expect_seg_fault=0)
 153     self.RunAndVerify(env_var_value='1',
 154                       flag_value=None,
 155                       expect_seg_fault=1)
 156
 157   def testFlag(self):
 158     """Tests using the --gtest_break_on_failure flag."""
 159
 160     self.RunAndVerify(env_var_value=None,
 161                       flag_value='0',
 162                       expect_seg_fault=0)
 163     self.RunAndVerify(env_var_value=None,
 164                       flag_value='1',
 165                       expect_seg_fault=1)
 166
 167   def testFlagOverridesEnvVar(self):
 168     """Tests that the flag overrides the environment variable."""
 169
 170     self.RunAndVerify(env_var_value='0',
 171                       flag_value='0',
 172                       expect_seg_fault=0)
 173     self.RunAndVerify(env_var_value='0',
 174                       flag_value='1',
 175                       expect_seg_fault=1)
 176     self.RunAndVerify(env_var_value='1',
 177                       flag_value='0',
 178                       expect_seg_fault=0)
 179     self.RunAndVerify(env_var_value='1',
 180                       flag_value='1',
 181                       expect_seg_fault=1)
 182
 183   def testBreakOnFailureOverridesThrowOnFailure(self):
 184     """Tests that gtest_break_on_failure overrides gtest_throw_on_failure."""
 185
 186     SetEnvVar(THROW_ON_FAILURE_ENV_VAR, '1')
 187     try:
 188       self.RunAndVerify(env_var_value=None,
 189                         flag_value='1',
 190                         expect_seg_fault=1)
 191     finally:
 192       SetEnvVar(THROW_ON_FAILURE_ENV_VAR, None)
 193
 194   if IS_WINDOWS:
 195     def testCatchExceptionsDoesNotInterfere(self):
 196       """Tests that gtest_catch_exceptions doesn't interfere."""
 197
 198       SetEnvVar(CATCH_EXCEPTIONS_ENV_VAR, '1')
 199       try:
 200         self.RunAndVerify(env_var_value='1',
 201                           flag_value='1',
 202                           expect_seg_fault=1)
 203       finally:
 204         SetEnvVar(CATCH_EXCEPTIONS_ENV_VAR, None)
 205
 206
 207 if __name__ == '__main__':
 208   gtest_test_utils.Main()