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//
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// 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 that Google Mock constructs can be used in a large number of
// threads concurrently.

#include "gmock/gmock.h"
#include "gtest/gtest.h"

namespace testing {
namespace {

// From gtest-port.h.
using ::testing::internal::ThreadWithParam;

// The maximum number of test threads (not including helper threads)
// to create.
const int kMaxTestThreads = 50;

// How many times to repeat a task in a test thread.
const int kRepeat = 50;

class MockFoo
{
public:
    MOCK_METHOD1(Bar, int(int n)); // NOLINT
    MOCK_METHOD2(Baz, char(const char *s1, const std::string &s2)); // NOLINT
};

// Helper for waiting for the given thread to finish and then deleting it.
template<typename T>
void JoinAndDelete(ThreadWithParam<T> *t)
{
    t->Join();
    delete t;
}

struct Dummy {
};

// Tests that different mock objects can be used in their respective
// threads.  This should generate no Google Test failure.
void TestConcurrentMockObjects(Dummy /* dummy */)
{
    // Creates a mock and does some typical operations on it.
    MockFoo foo;
    ON_CALL(foo, Bar(_))
        .WillByDefault(Return(1));
    ON_CALL(foo, Baz(_, _))
        .WillByDefault(Return('b'));
    ON_CALL(foo, Baz(_, "you"))
        .WillByDefault(Return('a'));

    EXPECT_CALL(foo, Bar(0))
        .Times(AtMost(3));
    EXPECT_CALL(foo, Baz(_, _));
    EXPECT_CALL(foo, Baz("hi", "you"))
        .WillOnce(Return('z'))
        .WillRepeatedly(DoDefault());

    EXPECT_EQ(1, foo.Bar(0));
    EXPECT_EQ(1, foo.Bar(0));
    EXPECT_EQ('z', foo.Baz("hi", "you"));
    EXPECT_EQ('a', foo.Baz("hi", "you"));
    EXPECT_EQ('b', foo.Baz("hi", "me"));
}

// Tests invoking methods of the same mock object in multiple threads.

struct Helper1Param {
    MockFoo *mock_foo;
    int *count;
};

void Helper1(Helper1Param param)
{
    for (int i = 0; i < kRepeat; i++) {
        const char ch = param.mock_foo->Baz("a", "b");
        if (ch == 'a') {
            // It was an expected call.
            (*param.count)++;
        } else {
            // It was an excessive call.
            EXPECT_EQ('\0', ch);
        }

        // An unexpected call.
        EXPECT_EQ('\0', param.mock_foo->Baz("x", "y")) << "Expected failure.";

        // An uninteresting call.
        EXPECT_EQ(1, param.mock_foo->Bar(5));
    }
}

// This should generate 3*kRepeat + 1 failures in total.
void TestConcurrentCallsOnSameObject(Dummy /* dummy */)
{
    MockFoo foo;

    ON_CALL(foo, Bar(_))
        .WillByDefault(Return(1));
    EXPECT_CALL(foo, Baz(_, "b"))
        .Times(kRepeat)
        .WillRepeatedly(Return('a'));
    EXPECT_CALL(foo, Baz(_, "c")); // Expected to be unsatisfied.

    // This chunk of code should generate kRepeat failures about
    // excessive calls, and 2*kRepeat failures about unexpected calls.
    int count1 = 0;
    const Helper1Param param = {&foo, &count1};
    ThreadWithParam<Helper1Param> *const t =
        new ThreadWithParam<Helper1Param>(Helper1, param, nullptr);

    int count2 = 0;
    const Helper1Param param2 = {&foo, &count2};
    Helper1(param2);
    JoinAndDelete(t);

    EXPECT_EQ(kRepeat, count1 + count2);

    // foo's destructor should generate one failure about unsatisfied
    // expectation.
}

// Tests using the same mock object in multiple threads when the
// expectations are partially ordered.

void Helper2(MockFoo *foo)
{
    for (int i = 0; i < kRepeat; i++) {
        foo->Bar(2);
        foo->Bar(3);
    }
}

// This should generate no Google Test failures.
void TestPartiallyOrderedExpectationsWithThreads(Dummy /* dummy */)
{
    MockFoo foo;
    Sequence s1, s2;

    {
        InSequence dummy;
        EXPECT_CALL(foo, Bar(0));
        EXPECT_CALL(foo, Bar(1))
            .InSequence(s1, s2);
    }

    EXPECT_CALL(foo, Bar(2))
        .Times(2 * kRepeat)
        .InSequence(s1)
        .RetiresOnSaturation();
    EXPECT_CALL(foo, Bar(3))
        .Times(2 * kRepeat)
        .InSequence(s2);

    {
        InSequence dummy;
        EXPECT_CALL(foo, Bar(2))
            .InSequence(s1, s2);
        EXPECT_CALL(foo, Bar(4));
    }

    foo.Bar(0);
    foo.Bar(1);

    ThreadWithParam<MockFoo *> *const t =
        new ThreadWithParam<MockFoo *>(Helper2, &foo, nullptr);
    Helper2(&foo);
    JoinAndDelete(t);

    foo.Bar(2);
    foo.Bar(4);
}

// Tests using Google Mock constructs in many threads concurrently.
TEST(StressTest, CanUseGMockWithThreads)
{
    void (*test_routines[])(Dummy dummy) = {
        &TestConcurrentMockObjects,
        &TestConcurrentCallsOnSameObject,
        &TestPartiallyOrderedExpectationsWithThreads,
    };

    const int kRoutines = sizeof(test_routines) / sizeof(test_routines[0]);
    const int kCopiesOfEachRoutine = kMaxTestThreads / kRoutines;
    const int kTestThreads = kCopiesOfEachRoutine * kRoutines;
    ThreadWithParam<Dummy> *threads[kTestThreads] = {};
    for (int i = 0; i < kTestThreads; i++) {
        // Creates a thread to run the test function.
        threads[i] = new ThreadWithParam<Dummy>(test_routines[i % kRoutines],
                                                Dummy(), nullptr);
        GTEST_LOG_(INFO) << "Thread #" << i << " running . . .";
    }

    // At this point, we have many threads running.
    for (int i = 0; i < kTestThreads; i++) {
        JoinAndDelete(threads[i]);
    }

    // Ensures that the correct number of failures have been reported.
    const TestInfo *const info = UnitTest::GetInstance()->current_test_info();
    const TestResult &result = *info->result();
    const int kExpectedFailures = (3 * kRepeat + 1) * kCopiesOfEachRoutine;
    GTEST_CHECK_(kExpectedFailures == result.total_part_count())
        << "Expected " << kExpectedFailures << " failures, but got "
        << result.total_part_count();
}

} // namespace
} // namespace testing

int main(int argc, char **argv)
{
    testing::InitGoogleMock(&argc, argv);

    const int exit_code = RUN_ALL_TESTS(); // Expected to fail.
    GTEST_CHECK_(exit_code != 0) << "RUN_ALL_TESTS() did not fail as expected";

    printf("\nPASS\n");
    return 0;
}
