gtest_catch_exceptions_test.py

#!/usr/bin/env python
#
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"""Tests Google Test's exception catching behavior.

This script invokes gtest_catch_exceptions_test_ and
gtest_catch_exceptions_ex_test_ (programs written with
Google Test) and verifies their output.
"""

__author__ = 'vladl@google.com (Vlad Losev)'

import os

import gtest_test_utils

# Constants.
FLAG_PREFIX = '--gtest_'
LIST_TESTS_FLAG = FLAG_PREFIX + 'list_tests'
NO_CATCH_EXCEPTIONS_FLAG = FLAG_PREFIX + 'catch_exceptions=0'
FILTER_FLAG = FLAG_PREFIX + 'filter'

# Path to the gtest_catch_exceptions_ex_test_ binary, compiled with
# exceptions enabled.
EX_EXE_PATH = gtest_test_utils.GetTestExecutablePath(
    'gtest_catch_exceptions_ex_test_')

# Path to the gtest_catch_exceptions_test_ binary, compiled with
# exceptions disabled.
EXE_PATH = gtest_test_utils.GetTestExecutablePath(
    'gtest_catch_exceptions_no_ex_test_')

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)

TEST_LIST = gtest_test_utils.Subprocess(
    [EXE_PATH, LIST_TESTS_FLAG], env=environ).output

SUPPORTS_SEH_EXCEPTIONS = 'ThrowsSehException' in TEST_LIST

if SUPPORTS_SEH_EXCEPTIONS:
  BINARY_OUTPUT = gtest_test_utils.Subprocess([EXE_PATH], env=environ).output

EX_BINARY_OUTPUT = gtest_test_utils.Subprocess(
    [EX_EXE_PATH], env=environ).output


# The tests.
if SUPPORTS_SEH_EXCEPTIONS:
  # pylint:disable-msg=C6302
  class CatchSehExceptionsTest(gtest_test_utils.TestCase):
    """Tests exception-catching behavior."""


    def TestSehExceptions(self, test_output):
      self.assert_('SEH exception with code 0x2a thrown '
                   'in the test fixture\'s constructor'
                   in test_output)
      self.assert_('SEH exception with code 0x2a thrown '
                   'in the test fixture\'s destructor'
                   in test_output)
      self.assert_('SEH exception with code 0x2a thrown in SetUpTestCase()'
                   in test_output)
      self.assert_('SEH exception with code 0x2a thrown in TearDownTestCase()'
                   in test_output)
      self.assert_('SEH exception with code 0x2a thrown in SetUp()'
                   in test_output)
      self.assert_('SEH exception with code 0x2a thrown in TearDown()'
                   in test_output)
      self.assert_('SEH exception with code 0x2a thrown in the test body'
                   in test_output)

    def testCatchesSehExceptionsWithCxxExceptionsEnabled(self):
      self.TestSehExceptions(EX_BINARY_OUTPUT)

    def testCatchesSehExceptionsWithCxxExceptionsDisabled(self):
      self.TestSehExceptions(BINARY_OUTPUT)


class CatchCxxExceptionsTest(gtest_test_utils.TestCase):
  """Tests C++ exception-catching behavior.

     Tests in this test case verify that:
     * C++ exceptions are caught and logged as C++ (not SEH) exceptions
     * Exception thrown affect the remainder of the test work flow in the
       expected manner.
  """

  def testCatchesCxxExceptionsInFixtureConstructor(self):
    self.assert_('C++ exception with description '
                 '"Standard C++ exception" thrown '
                 'in the test fixture\'s constructor'
                 in EX_BINARY_OUTPUT)
    self.assert_('unexpected' not in EX_BINARY_OUTPUT,
                 'This failure belongs in this test only if '
                 '"CxxExceptionInConstructorTest" (no quotes) '
                 'appears on the same line as words "called unexpectedly"')

  if ('CxxExceptionInDestructorTest.ThrowsExceptionInDestructor' in
      EX_BINARY_OUTPUT):

    def testCatchesCxxExceptionsInFixtureDestructor(self):
      self.assert_('C++ exception with description '
                   '"Standard C++ exception" thrown '
                   'in the test fixture\'s destructor'
                   in EX_BINARY_OUTPUT)
      self.assert_('CxxExceptionInDestructorTest::TearDownTestCase() '
                   'called as expected.'
                   in EX_BINARY_OUTPUT)

  def testCatchesCxxExceptionsInSetUpTestCase(self):
    self.assert_('C++ exception with description "Standard C++ exception"'
                 ' thrown in SetUpTestCase()'
                 in EX_BINARY_OUTPUT)
    self.assert_('CxxExceptionInConstructorTest::TearDownTestCase() '
                 'called as expected.'
                 in EX_BINARY_OUTPUT)
    self.assert_('CxxExceptionInSetUpTestCaseTest constructor '
                 'called as expected.'
                 in EX_BINARY_OUTPUT)
    self.assert_('CxxExceptionInSetUpTestCaseTest destructor '
                 'called as expected.'
                 in EX_BINARY_OUTPUT)
    self.assert_('CxxExceptionInSetUpTestCaseTest::SetUp() '
                 'called as expected.'
                 in EX_BINARY_OUTPUT)
    self.assert_('CxxExceptionInSetUpTestCaseTest::TearDown() '
                 'called as expected.'
                 in EX_BINARY_OUTPUT)
    self.assert_('CxxExceptionInSetUpTestCaseTest test body '
                 'called as expected.'
                 in EX_BINARY_OUTPUT)

  def testCatchesCxxExceptionsInTearDownTestCase(self):
    self.assert_('C++ exception with description "Standard C++ exception"'
                 ' thrown in TearDownTestCase()'
                 in EX_BINARY_OUTPUT)

  def testCatchesCxxExceptionsInSetUp(self):
    self.assert_('C++ exception with description "Standard C++ exception"'
                 ' thrown in SetUp()'
                 in EX_BINARY_OUTPUT)
    self.assert_('CxxExceptionInSetUpTest::TearDownTestCase() '
                 'called as expected.'
                 in EX_BINARY_OUTPUT)
    self.assert_('CxxExceptionInSetUpTest destructor '
                 'called as expected.'
                 in EX_BINARY_OUTPUT)
    self.assert_('CxxExceptionInSetUpTest::TearDown() '
                 'called as expected.'
                 in EX_BINARY_OUTPUT)
    self.assert_('unexpected' not in EX_BINARY_OUTPUT,
                 'This failure belongs in this test only if '
                 '"CxxExceptionInSetUpTest" (no quotes) '
                 'appears on the same line as words "called unexpectedly"')

  def testCatchesCxxExceptionsInTearDown(self):
    self.assert_('C++ exception with description "Standard C++ exception"'
                 ' thrown in TearDown()'
                 in EX_BINARY_OUTPUT)
    self.assert_('CxxExceptionInTearDownTest::TearDownTestCase() '
                 'called as expected.'
                 in EX_BINARY_OUTPUT)
    self.assert_('CxxExceptionInTearDownTest destructor '
                 'called as expected.'
                 in EX_BINARY_OUTPUT)

  def testCatchesCxxExceptionsInTestBody(self):
    self.assert_('C++ exception with description "Standard C++ exception"'
                 ' thrown in the test body'
                 in EX_BINARY_OUTPUT)
    self.assert_('CxxExceptionInTestBodyTest::TearDownTestCase() '
                 'called as expected.'
                 in EX_BINARY_OUTPUT)
    self.assert_('CxxExceptionInTestBodyTest destructor '
                 'called as expected.'
                 in EX_BINARY_OUTPUT)
    self.assert_('CxxExceptionInTestBodyTest::TearDown() '
                 'called as expected.'
                 in EX_BINARY_OUTPUT)

  def testCatchesNonStdCxxExceptions(self):
    self.assert_('Unknown C++ exception thrown in the test body'
                 in EX_BINARY_OUTPUT)

  def testUnhandledCxxExceptionsAbortTheProgram(self):
    # Filters out SEH exception tests on Windows. Unhandled SEH exceptions
    # cause tests to show pop-up windows there.
    FITLER_OUT_SEH_TESTS_FLAG = FILTER_FLAG + '=-*Seh*'
    # By default, Google Test doesn't catch the exceptions.
    uncaught_exceptions_ex_binary_output = gtest_test_utils.Subprocess(
        [EX_EXE_PATH,
         NO_CATCH_EXCEPTIONS_FLAG,
         FITLER_OUT_SEH_TESTS_FLAG],
        env=environ).output

    self.assert_('Unhandled C++ exception terminating the program'
                 in uncaught_exceptions_ex_binary_output)
    self.assert_('unexpected' not in uncaught_exceptions_ex_binary_output)


if __name__ == '__main__':
  gtest_test_utils.Main()