#!/usr/bin/env python # # 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 for Google Test's break-on-failure mode. A user can ask Google Test to seg-fault when an assertion fails, using either the GTEST_BREAK_ON_FAILURE environment variable or the --gtest_break_on_failure flag. This script tests such functionality by invoking gtest_break_on_failure_unittest_ (a program written with Google Test) with different environments and command line flags. """ __author__ = 'wan@google.com (Zhanyong Wan)' import gtest_test_utils import os import sys # Constants. IS_WINDOWS = os.name == 'nt' # The environment variable for enabling/disabling the break-on-failure mode. BREAK_ON_FAILURE_ENV_VAR = 'GTEST_BREAK_ON_FAILURE' # The command line flag for enabling/disabling the break-on-failure mode. BREAK_ON_FAILURE_FLAG = 'gtest_break_on_failure' # The environment variable for enabling/disabling the throw-on-failure mode. THROW_ON_FAILURE_ENV_VAR = 'GTEST_THROW_ON_FAILURE' # The environment variable for enabling/disabling the catch-exceptions mode. CATCH_EXCEPTIONS_ENV_VAR = 'GTEST_CATCH_EXCEPTIONS' # Path to the gtest_break_on_failure_unittest_ program. EXE_PATH = gtest_test_utils.GetTestExecutablePath( 'gtest_break_on_failure_unittest_') # Utilities. environ = os.environ.copy() def SetEnvVar(env_var, value): """Sets an environment variable to a given value; unsets it when the given value is None. """ if value is not None: environ[env_var] = value elif env_var in environ: del environ[env_var] def Run(command): """Runs a command; returns 1 if it was killed by a signal, or 0 otherwise.""" p = gtest_test_utils.Subprocess(command, env=environ) if p.terminated_by_signal: return 1 else: return 0 # The tests. class GTestBreakOnFailureUnitTest(gtest_test_utils.TestCase): """Tests using the GTEST_BREAK_ON_FAILURE environment variable or the --gtest_break_on_failure flag to turn assertion failures into segmentation faults. """ def RunAndVerify(self, env_var_value, flag_value, expect_seg_fault): """Runs gtest_break_on_failure_unittest_ and verifies that it does (or does not) have a seg-fault. Args: env_var_value: value of the GTEST_BREAK_ON_FAILURE environment variable; None if the variable should be unset. flag_value: value of the --gtest_break_on_failure flag; None if the flag should not be present. expect_seg_fault: 1 if the program is expected to generate a seg-fault; 0 otherwise. """ SetEnvVar(BREAK_ON_FAILURE_ENV_VAR, env_var_value) if env_var_value is None: env_var_value_msg = ' is not set' else: env_var_value_msg = '=' + env_var_value if flag_value is None: flag = '' elif flag_value == '0': flag = '--%s=0' % BREAK_ON_FAILURE_FLAG else: flag = '--%s' % BREAK_ON_FAILURE_FLAG command = [EXE_PATH] if flag: command.append(flag) if expect_seg_fault: should_or_not = 'should' else: should_or_not = 'should not' has_seg_fault = Run(command) SetEnvVar(BREAK_ON_FAILURE_ENV_VAR, None) msg = ('when %s%s, an assertion failure in "%s" %s cause a seg-fault.' % (BREAK_ON_FAILURE_ENV_VAR, env_var_value_msg, ' '.join(command), should_or_not)) self.assert_(has_seg_fault == expect_seg_fault, msg) def testDefaultBehavior(self): """Tests the behavior of the default mode.""" self.RunAndVerify(env_var_value=None, flag_value=None, expect_seg_fault=0) def testEnvVar(self): """Tests using the GTEST_BREAK_ON_FAILURE environment variable.""" self.RunAndVerify(env_var_value='0', flag_value=None, expect_seg_fault=0) self.RunAndVerify(env_var_value='1', flag_value=None, expect_seg_fault=1) def testFlag(self): """Tests using the --gtest_break_on_failure flag.""" self.RunAndVerify(env_var_value=None, flag_value='0', expect_seg_fault=0) self.RunAndVerify(env_var_value=None, flag_value='1', expect_seg_fault=1) def testFlagOverridesEnvVar(self): """Tests that the flag overrides the environment variable.""" self.RunAndVerify(env_var_value='0', flag_value='0', expect_seg_fault=0) self.RunAndVerify(env_var_value='0', flag_value='1', expect_seg_fault=1) self.RunAndVerify(env_var_value='1', flag_value='0', expect_seg_fault=0) self.RunAndVerify(env_var_value='1', flag_value='1', expect_seg_fault=1) def testBreakOnFailureOverridesThrowOnFailure(self): """Tests that gtest_break_on_failure overrides gtest_throw_on_failure.""" SetEnvVar(THROW_ON_FAILURE_ENV_VAR, '1') try: self.RunAndVerify(env_var_value=None, flag_value='1', expect_seg_fault=1) finally: SetEnvVar(THROW_ON_FAILURE_ENV_VAR, None) if IS_WINDOWS: def testCatchExceptionsDoesNotInterfere(self): """Tests that gtest_catch_exceptions doesn't interfere.""" SetEnvVar(CATCH_EXCEPTIONS_ENV_VAR, '1') try: self.RunAndVerify(env_var_value='1', flag_value='1', expect_seg_fault=1) finally: SetEnvVar(CATCH_EXCEPTIONS_ENV_VAR, None) if __name__ == '__main__': gtest_test_utils.Main()