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diff --git a/external/gtest/googletest/test/gtest_help_test.py b/external/gtest/googletest/test/gtest_help_test.py
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+#!/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 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 sys
+from googletest.test import gtest_test_utils
+
+
+FREEBSD = ('FreeBSD', 'GNU/kFreeBSD')
+NETBSD = ('NetBSD',)
+OPENBSD = ('OpenBSD',)
+
+
+def is_bsd_based_os() -> bool:
+  """Determine whether or not the OS is BSD-based."""
+  if os.name != 'posix':
+    return False
+
+  return os.uname()[0] in (FREEBSD + NETBSD + OPENBSD)
+
+
+IS_DARWIN = os.name == 'posix' and os.uname()[0] == 'Darwin'
+IS_LINUX = os.name == 'posix' and os.uname()[0] == 'Linux'
+IS_GNUHURD = os.name == 'posix' and os.uname()[0] == 'GNU'
+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'
+LIST_TESTS_FLAG = FLAG_PREFIX + 'list_tests'
+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
+)
+
+HAS_ABSL_FLAGS = '--has_absl_flags' in sys.argv
+
+# 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'brief.*'
+    + 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 run_with_flag(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 test_prints_help_with_full_flag(self):
+    """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.
+    """
+
+    exit_code, output = run_with_flag('--help')
+    if HAS_ABSL_FLAGS:
+      # The Abseil flags library prints the ProgramUsageMessage() with
+      # --help and returns 1.
+      self.assertEqual(1, exit_code)
+    else:
+      self.assertEqual(0, exit_code)
+
+    self.assertTrue(HELP_REGEX.search(output), output)
+
+    if IS_DARWIN or IS_LINUX or IS_GNUHURD or is_bsd_based_os():
+      self.assertIn(STREAM_RESULT_TO_FLAG, output)
+    else:
+      self.assertNotIn(STREAM_RESULT_TO_FLAG, output)
+
+    if SUPPORTS_DEATH_TESTS and not IS_WINDOWS:
+      self.assertIn(DEATH_TEST_STYLE_FLAG, output)
+    else:
+      self.assertNotIn(DEATH_TEST_STYLE_FLAG, output)
+
+  def test_runs_tests_without_help_flag(self):
+    """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.
+    """
+
+    exit_code, output = run_with_flag(None)
+    self.assertNotEqual(exit_code, 0)
+    self.assertFalse(HELP_REGEX.search(output), output)
+
+  def test_runs_tests_with_gtest_internal_flag(self):
+    """Verifies correct behavior when internal testing flag is specified.
+
+    Verifies that the tests are run and no help message is printed when
+    a flag starting with Google Test prefix and 'internal_' is supplied.
+    """
+
+    exit_code, output = run_with_flag(INTERNAL_FLAG_FOR_TESTING)
+    self.assertNotEqual(exit_code, 0)
+    self.assertFalse(HELP_REGEX.search(output), output)
+
+
+if __name__ == '__main__':
+  if '--has_absl_flags' in sys.argv:
+    sys.argv.remove('--has_absl_flags')
+  gtest_test_utils.Main()