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diff --git a/external/gtest/googletest/test/gtest_environment_test.cc b/external/gtest/googletest/test/gtest_environment_test.cc
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+++ b/external/gtest/googletest/test/gtest_environment_test.cc
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+// Copyright 2007, 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 using global test environments.
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "gtest/gtest.h"
+#include "src/gtest-internal-inl.h"
+
+namespace {
+
+enum FailureType { NO_FAILURE, NON_FATAL_FAILURE, FATAL_FAILURE };
+
+// Was SetUp run?
+bool set_up_was_run;
+// Was TearDown run?
+bool tear_down_was_run;
+// Was the TEST run?
+bool test_was_run;
+
+// For testing using global test environments.
+class MyEnvironment : public testing::Environment {
+ public:
+  // Depending on the value of failure_in_set_up_, SetUp() will
+  // generate a non-fatal failure, generate a fatal failure, or
+  // succeed.
+  void SetUp() override {
+    set_up_was_run = true;
+
+    switch (failure_in_set_up_) {
+      case NON_FATAL_FAILURE:
+        ADD_FAILURE() << "Expected non-fatal failure in global set-up.";
+        break;
+      case FATAL_FAILURE:
+        FAIL() << "Expected fatal failure in global set-up.";
+        break;
+      default:
+        break;
+    }
+  }
+
+  // Generates a non-fatal failure.
+  void TearDown() override {
+    tear_down_was_run = true;
+    ADD_FAILURE() << "Expected non-fatal failure in global tear-down.";
+  }
+
+  // We call this function to set the type of failure SetUp() should
+  // generate.
+  void set_failure_in_set_up(FailureType type) { failure_in_set_up_ = type; }
+
+ private:
+  FailureType failure_in_set_up_;
+};
+
+// The sole purpose of this TEST is to enable us to check whether it
+// was run.
+TEST(FooTest, Bar) { test_was_run = true; }
+
+// Prints the message and aborts the program if condition is false.
+void Check(bool condition, const char* msg) {
+  if (!condition) {
+    printf("FAILED: %s\n", msg);
+    testing::internal::posix::Abort();
+  }
+}
+
+// Runs the tests.  Return true if and only if successful.
+//
+// The 'failure' parameter specifies the type of failure that should
+// be generated by the global set-up.
+int RunAllTests(MyEnvironment* env, FailureType failure) {
+  set_up_was_run = false;
+  tear_down_was_run = false;
+  test_was_run = false;
+  env->set_failure_in_set_up(failure);
+  testing::internal::GetUnitTestImpl()->ClearAdHocTestResult();
+  return RUN_ALL_TESTS();
+}
+
+// Registers a global test environment, and verifies that the
+// registration function returns its argument.
+MyEnvironment* RegisterTestEnv() {
+  MyEnvironment* const env = new MyEnvironment;
+  Check(testing::AddGlobalTestEnvironment(env) == env,
+        "AddGlobalTestEnvironment() should return its argument.");
+  return env;
+}
+
+// Verifies that RUN_ALL_TESTS() runs the tests when the global
+// set-up is successful.
+void TestGlobalSetUp() {
+  MyEnvironment* const env = RegisterTestEnv();
+  Check(RunAllTests(env, NO_FAILURE) != 0,
+        "RUN_ALL_TESTS() should return non-zero, as the global tear-down "
+        "should generate a failure.");
+  Check(test_was_run,
+        "The tests should run, as the global set-up should generate no "
+        "failure");
+  Check(tear_down_was_run,
+        "The global tear-down should run, as the global set-up was run.");
+}
+
+// Verifies that RUN_ALL_TESTS() runs the tests when the global
+// set-up generates no fatal failure.
+void TestTestsRun() {
+  MyEnvironment* const env = RegisterTestEnv();
+  Check(RunAllTests(env, NON_FATAL_FAILURE) != 0,
+        "RUN_ALL_TESTS() should return non-zero, as both the global set-up "
+        "and the global tear-down should generate a non-fatal failure.");
+  Check(test_was_run,
+        "The tests should run, as the global set-up should generate no "
+        "fatal failure.");
+  Check(tear_down_was_run,
+        "The global tear-down should run, as the global set-up was run.");
+}
+
+// Verifies that RUN_ALL_TESTS() runs no test when the global set-up
+// generates a fatal failure.
+void TestNoTestsRunSetUpFailure() {
+  MyEnvironment* const env = RegisterTestEnv();
+  Check(RunAllTests(env, FATAL_FAILURE) != 0,
+        "RUN_ALL_TESTS() should return non-zero, as the global set-up "
+        "should generate a fatal failure.");
+  Check(!test_was_run,
+        "The tests should not run, as the global set-up should generate "
+        "a fatal failure.");
+  Check(tear_down_was_run,
+        "The global tear-down should run, as the global set-up was run.");
+}
+
+// Verifies that RUN_ALL_TESTS() doesn't do global set-up or
+// tear-down when there is no test to run.
+void TestNoTestsSkipsSetUp() {
+  MyEnvironment* const env = RegisterTestEnv();
+  GTEST_FLAG_SET(filter, "-*");
+  Check(RunAllTests(env, NO_FAILURE) == 0,
+        "RUN_ALL_TESTS() should return zero, as there is no test to run.");
+  Check(!set_up_was_run,
+        "The global set-up should not run, as there is no test to run.");
+  Check(!tear_down_was_run,
+        "The global tear-down should not run, "
+        "as the global set-up was not run.");
+}
+
+}  // namespace
+
+int main(int argc, char** argv) {
+  testing::InitGoogleTest(&argc, argv);
+
+  TestGlobalSetUp();
+  TestTestsRun();
+  TestNoTestsRunSetUpFailure();
+  TestNoTestsSkipsSetUp();
+
+  printf("PASS\n");
+  return 0;
+}