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#!/usr/bin/env python

#

# Copyright 2006, Google Inc.

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"""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_')

environ = gtest_test_utils.environ

SetEnvVar = gtest_test_utils.SetEnvVar

# Tests in this file run a Google-Test-based test program and expect it

# to terminate prematurely.  Therefore they are incompatible with

# the premature-exit-file protocol by design.  Unset the

# premature-exit filepath to prevent Google Test from creating

# the file.

SetEnvVar(gtest_test_utils.PREMATURE_EXIT_FILE_ENV_VAR, None)

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;

    """

    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()