#!/usr/bin/env python
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"""Tests the --help flag of Google C++ Testing and Mocking Framework.
SYNOPSIS
gtest_help_test.py --build_dir=BUILD/DIR
# where BUILD/DIR contains the built gtest_help_test_ file.
gtest_help_test.py
"""
import os
import re
import gtest_test_utils
IS_LINUX = os.name == 'posix' and os.uname()[0] == 'Linux'
IS_WINDOWS = os.name == 'nt'
PROGRAM_PATH = gtest_test_utils.GetTestExecutablePath('gtest_help_test_')
FLAG_PREFIX = '--gtest_'
DEATH_TEST_STYLE_FLAG = FLAG_PREFIX + 'death_test_style'
STREAM_RESULT_TO_FLAG = FLAG_PREFIX + 'stream_result_to'
UNKNOWN_FLAG = FLAG_PREFIX + 'unknown_flag_for_testing'
LIST_TESTS_FLAG = FLAG_PREFIX + 'list_tests'
INCORRECT_FLAG_VARIANTS = [re.sub('^--', '-', LIST_TESTS_FLAG),
re.sub('^--', '/', LIST_TESTS_FLAG),
re.sub('_', '-', LIST_TESTS_FLAG)]
INTERNAL_FLAG_FOR_TESTING = FLAG_PREFIX + 'internal_flag_for_testing'
SUPPORTS_DEATH_TESTS = "DeathTest" in gtest_test_utils.Subprocess(
[PROGRAM_PATH, LIST_TESTS_FLAG]).output
# The help message must match this regex.
HELP_REGEX = re.compile(
FLAG_PREFIX + r'list_tests.*' +
FLAG_PREFIX + r'filter=.*' +
FLAG_PREFIX + r'also_run_disabled_tests.*' +
FLAG_PREFIX + r'repeat=.*' +
FLAG_PREFIX + r'shuffle.*' +
FLAG_PREFIX + r'random_seed=.*' +
FLAG_PREFIX + r'color=.*' +
FLAG_PREFIX + r'print_time.*' +
FLAG_PREFIX + r'output=.*' +
FLAG_PREFIX + r'break_on_failure.*' +
FLAG_PREFIX + r'throw_on_failure.*' +
FLAG_PREFIX + r'catch_exceptions=0.*',
re.DOTALL)
def RunWithFlag(flag):
"""Runs gtest_help_test_ with the given flag.
Returns:
the exit code and the text output as a tuple.
Args:
flag: the command-line flag to pass to gtest_help_test_, or None.
"""
if flag is None:
command = [PROGRAM_PATH]
else:
command = [PROGRAM_PATH, flag]
child = gtest_test_utils.Subprocess(command)
return child.exit_code, child.output
class GTestHelpTest(gtest_test_utils.TestCase):
"""Tests the --help flag and its equivalent forms."""
def TestHelpFlag(self, flag):
"""Verifies correct behavior when help flag is specified.
The right message must be printed and the tests must
skipped when the given flag is specified.
Args:
flag: A flag to pass to the binary or None.
"""
exit_code, output = RunWithFlag(flag)
self.assertEquals(0, exit_code)
self.assert_(HELP_REGEX.search(output), output)
if IS_LINUX:
self.assert_(STREAM_RESULT_TO_FLAG in output, output)
else:
self.assert_(STREAM_RESULT_TO_FLAG not in output, output)
if SUPPORTS_DEATH_TESTS and not IS_WINDOWS:
self.assert_(DEATH_TEST_STYLE_FLAG in output, output)
else:
self.assert_(DEATH_TEST_STYLE_FLAG not in output, output)
def TestNonHelpFlag(self, flag):
"""Verifies correct behavior when no help flag is specified.
Verifies that when no help flag is specified, the tests are run
and the help message is not printed.
Args:
flag: A flag to pass to the binary or None.
"""
exit_code, output = RunWithFlag(flag)
self.assert_(exit_code != 0)
self.assert_(not HELP_REGEX.search(output), output)
def testPrintsHelpWithFullFlag(self):
self.TestHelpFlag('--help')
def testPrintsHelpWithShortFlag(self):
self.TestHelpFlag('-h')
def testPrintsHelpWithQuestionFlag(self):
self.TestHelpFlag('-?')
def testPrintsHelpWithWindowsStyleQuestionFlag(self):
self.TestHelpFlag('/?')
def testPrintsHelpWithUnrecognizedGoogleTestFlag(self):
self.TestHelpFlag(UNKNOWN_FLAG)
def testPrintsHelpWithIncorrectFlagStyle(self):
for incorrect_flag in INCORRECT_FLAG_VARIANTS:
self.TestHelpFlag(incorrect_flag)
def testRunsTestsWithoutHelpFlag(self):
"""Verifies that when no help flag is specified, the tests are run
and the help message is not printed."""
self.TestNonHelpFlag(None)
def testRunsTestsWithGtestInternalFlag(self):
"""Verifies that the tests are run and no help message is printed when
a flag starting with Google Test prefix and 'internal_' is supplied."""
self.TestNonHelpFlag(INTERNAL_FLAG_FOR_TESTING)
if __name__ == '__main__':
gtest_test_utils.Main()