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  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 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()
  209.