text: // Copyright 2009, Google Inc.
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  //
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  //     * 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.
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  // this software without specific prior written permission.
  //
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  // "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,
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  // 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 enabled.
  
  #include "gtest/gtest.h"
  
  #include <stdlib.h>
  #include <stdio.h>
  #include <string.h>
  #include <stdexcept>
  
  // Prints the given failure message and exits the program with
  // non-zero.  We use this instead of a Google Test assertion to
  // indicate a failure, as the latter is been tested and cannot be
  // relied on.
  void Fail(const char* msg) {
    printf("FAILURE: %s\n", msg);
    fflush(stdout);
    exit(1);
  }
  
  // Tests that an assertion failure throws a subclass of
  // std::runtime_error.
  void TestFailureThrowsRuntimeError() {
    testing::GTEST_FLAG(throw_on_failure) = true;
  
    // A successful assertion shouldn't throw.
    try {
      EXPECT_EQ(3, 3);
    } catch(...) {
      Fail("A successful assertion wrongfully threw.");
    }
  
    // A failed assertion should throw a subclass of std::runtime_error.
    try {
      EXPECT_EQ(2, 3) << "Expected failure";
    } catch(const std::runtime_error& e) {
      if (strstr(e.what(), "Expected failure") != nullptr) return;
  
      printf("%s",
             "A failed assertion did throw an exception of the right type, "
             "but the message is incorrect.  Instead of containing \"Expected "
             "failure\", it is:\n");
      Fail(e.what());
    } catch(...) {
      Fail("A failed assertion threw the wrong type of exception.");
    }
    Fail("A failed assertion should've thrown but didn't.");
  }
  
  int main(int argc, char** argv) {
    testing::InitGoogleTest(&argc, argv);
  
    // We want to ensure that people can use Google Test assertions in
    // other testing frameworks, as long as they initialize Google Test
    // properly and set the thrown-on-failure mode.  Therefore, we don't
    // use Google Test's constructs for defining and running tests
    // (e.g. TEST and RUN_ALL_TESTS) here.
  
    TestFailureThrowsRuntimeError();
    return 0;
  }
  