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Testing Throw-on-Failure Configuration Management in Telegram

This test suite validates Google Test’s throw-on-failure functionality when exceptions are disabled, providing comprehensive verification of failure behavior control through environment variables and command line flags.

Test Coverage Overview

The test suite provides thorough coverage of Google Test’s throw-on-failure mode configuration options and behaviors.

Tests default throw-on-failure behavior
Validates GTEST_THROW_ON_FAILURE environment variable controls
Verifies –gtest_throw_on_failure flag functionality
Tests flag override behavior over environment variables

Implementation Analysis

The implementation uses a systematic approach to test various combinations of configuration settings.

The test suite employs helper methods for environment variable manipulation and command execution, with clear separation of test setup and verification logic. Python’s unittest framework is leveraged for structured test organization.

Technical Details

Uses Python unittest framework
Implements custom test utilities (gtest_test_utils)
Manages environment variables programmatically
Executes and validates compiled test program behavior
Handles subprocess execution and exit code verification

Best Practices Demonstrated

The test suite exemplifies several testing best practices for system-level integration testing.

Clear test case organization and naming
Comprehensive documentation of test scenarios
Proper test isolation through environment cleanup
Reusable test utilities
Detailed failure messages for debugging

drklo/telegram

TMessagesProj/jni/boringssl/third_party/googletest/test/googletest-throw-on-failure-test.py

            
#!/usr/bin/env python
#
# Copyright 2009, 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.

"""Tests Google Test's throw-on-failure mode with exceptions disabled.

This script invokes googletest-throw-on-failure-test_ (a program written with
Google Test) with different environments and command line flags.
"""

import os
import gtest_test_utils


# Constants.

# The command line flag for enabling/disabling the throw-on-failure mode.
THROW_ON_FAILURE = 'gtest_throw_on_failure'

# Path to the googletest-throw-on-failure-test_ program, compiled with
# exceptions disabled.
EXE_PATH = gtest_test_utils.GetTestExecutablePath(
    'googletest-throw-on-failure-test_')


# Utilities.


def SetEnvVar(env_var, value):
  """Sets an environment variable to a given value; unsets it when the
  given value is None.
  """

  env_var = env_var.upper()
  if value is not None:
    os.environ[env_var] = value
  elif env_var in os.environ:
    del os.environ[env_var]


def Run(command):
  """Runs a command; returns True/False if its exit code is/isn't 0."""

  print('Running "%s". . .' % ' '.join(command))
  p = gtest_test_utils.Subprocess(command)
  return p.exited and p.exit_code == 0


# The tests.
class ThrowOnFailureTest(gtest_test_utils.TestCase):
  """Tests the throw-on-failure mode."""

  def RunAndVerify(self, env_var_value, flag_value, should_fail):
    """Runs googletest-throw-on-failure-test_ and verifies that it does
    (or does not) exit with a non-zero code.

    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.
      should_fail:      True iff the program is expected to fail.
    """

    SetEnvVar(THROW_ON_FAILURE, 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' % THROW_ON_FAILURE
    else:
      flag = '--%s' % THROW_ON_FAILURE

    command = [EXE_PATH]
    if flag:
      command.append(flag)

    if should_fail:
      should_or_not = 'should'
    else:
      should_or_not = 'should not'

    failed = not Run(command)

    SetEnvVar(THROW_ON_FAILURE, None)

    msg = ('when %s%s, an assertion failure in "%s" %s cause a non-zero '
           'exit code.' %
           (THROW_ON_FAILURE, env_var_value_msg, ' '.join(command),
            should_or_not))
    self.assert_(failed == should_fail, msg)

  def testDefaultBehavior(self):
    """Tests the behavior of the default mode."""

    self.RunAndVerify(env_var_value=None, flag_value=None, should_fail=False)

  def testThrowOnFailureEnvVar(self):
    """Tests using the GTEST_THROW_ON_FAILURE environment variable."""

    self.RunAndVerify(env_var_value='0',
                      flag_value=None,
                      should_fail=False)
    self.RunAndVerify(env_var_value='1',
                      flag_value=None,
                      should_fail=True)

  def testThrowOnFailureFlag(self):
    """Tests using the --gtest_throw_on_failure flag."""

    self.RunAndVerify(env_var_value=None,
                      flag_value='0',
                      should_fail=False)
    self.RunAndVerify(env_var_value=None,
                      flag_value='1',
                      should_fail=True)

  def testThrowOnFailureFlagOverridesEnvVar(self):
    """Tests that --gtest_throw_on_failure overrides GTEST_THROW_ON_FAILURE."""

    self.RunAndVerify(env_var_value='0',
                      flag_value='0',
                      should_fail=False)
    self.RunAndVerify(env_var_value='0',
                      flag_value='1',
                      should_fail=True)
    self.RunAndVerify(env_var_value='1',
                      flag_value='0',
                      should_fail=False)
    self.RunAndVerify(env_var_value='1',
                      flag_value='1',
                      should_fail=True)


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