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// 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;
}
