No events to be sent to Amplitude with amplitude SDK when running in a junit 5 test unit

A very simple code like the following:

Amplitude client = Amplitude.getInstance();<br />        client.init(".....");<br />        Event e = new Event("TestEvent","TestUser");<br />        client.logEvent(e);<br />        client.flushEvents();<br />        client.shutdown();

The event can be sent to amplitude when I run these code in a java main() method, but cannot in a test unit.

There is no any errors when running a test unit, just cannot see the events in amplitude.

Is there anything I should concern ? I notice that the Amplitude SDK use a new Thread to send the event to amplitude, is that related with my issue?

Thanks.

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Accepted answers

Denis Holmes

Hi kenny ,

I am not entirely sure of the reason for this but you should be able to use it in a JUnit test, unless something is blocking it. Have you run the exact same code in both the JUNit test and the main method? I don’t believe there should be a reason for it to not work. Is the code running? Are there any errors given?

Kind Regards,
Denis

All comments

Denis Holmes

Hi kenny ,

Kind Regards,
Denis

kenny

Hi Denis, thanks for your reply. Yes, I run the exact same code in both the junit test and the main method. No errors in both codes.

I guess it’s related with Amplitude Java SDK. The SDK uses a new Thread to send the events. It seems that the junit test main thread ends before the events are sent to Amplitude. So, I have resolve the problem, the following codes can send the events to Amplitude now in a junit test:

    @Test<br />    void sendDataToAmplitude_with_callback() throws Exception{<br />        Amplitude client = Amplitude.getInstance();<br />        client.init("apiKeyXXXXXX");<br />        Event e = new Event("TestEvent","TestUser");<br /><br />        var countDownLatch = new CountDownLatch(1);<br />        AmplitudeCallbacks callbacks =new AmplitudeCallbacks(){<br />            @Override<br />            public void onLogEventServerResponse(Event event, int status, String message) {<br />                countDownLatch.countDown();<br />            }<br />        };<br />        client.logEvent(e, callbacks);<br />        client.flushEvents();<br />        countDownLatch.await();<br />        client.shutdown();<br />    }

We need to wait for the response.

Denis Holmes

Hi kenny ,

My apologies for my delayed response, I was OOO. Is the event now sending successfully?

Kind Regards,
Denis

kenny

Sorry for the horrible late reply, thanks Denis, yes, it works.

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