Gmock waiting for EXPECT_CALL Using Condition Variables and Mutex instead of QTest::qWait(ms)

Currently, my unittest uses a QTest::qWait(ms) to give enough time for a DBUS signal to be caught and the slot to execute in order to satisfy the EXPECT_CALL test. I want to remove the wait, and make GMock EXPECT_CALL, using std::condition_variable and std::mutex, to wait for the call.

Using the info found here: Expecting googlemock calls from another thread I ended up with the following code;

    std::condition_variable cv;
    std::mutex mu;
    bool ready{false};

    BatteryLevelEvent batteryFlatEvt(EventType::EVT_BATTERY_FLAT, 12,
                                     "MockEvent");
    // setting up the expected call on the DB    EXPECT_CALL(mock_db_, Insert(batteryFlatEvt.ToString()))
        .Times(1)
        .WillOnce(InvokeWithoutArgs([&]() {
            std::lock_guard<std::mutex> lock(mu);
            ready = true;
            cv.notify_one();
        }));

    // send DBUS message to trigger the Insert(...) call on mock_db_
    connection.send(batteryLevelEventSignal);

    // QTest::qWait(1000);  //<-- test passes with this!

    // test fails after 5 seconds
    std::unique_lock<std::mutex> lock(mu);
    EXPECT_TRUE(
        cv.wait_for(lock, std::chrono::seconds(5), [&ready] { return ready; }));
    lock.unlock();

    Mock::VerifyAndClearExpectations(&mock_db_);

The signal is definitely being sent as I can see it on dbus-monitor

Thanks heaps for your help.

Using;

• C++11,

• Gtest Master Branch,

Results...

Actual function call count doesn't match EXPECT_CALL(mock_db_, Insert(batteryFlatEvt.ToString()))...
         Expected: to be called once
           Actual: never called - unsatisfied and active
[  FAILED  ] EventServiceTester.TestReceivingEventSignals (5002 ms)

using QTest:qWait(ms)

[       OK ] EventServiceTester.TestReceivingEventSignals (1002 ms)