java - Asynchronous callback not invoked during test using Mockito -

i trying test application using mockito framework. following example works perfectly:

    val dl = mock(classof[dichlistener])     val = argumentcaptor.forclass(classof[int])     when(dl.test(i.capture())).thencallrealmethod()     dl.test(666)     i.getvalue shouldbe 666 

however, similar (but waiting asynchronous response), next 1 doesn't:

    when(dl.echoreqcallback(c.capture(), m.capture())).thencallrealmethod()     // not working:     // verify(dl).echoreqcallback(c.capture(), m.capture())      n2.sendechorequest("hello!")      thread.sleep(1000)     println(m.getvalue) 

echoreqcallback called after sendechorequest, dl mocked object. echoreqcallback run response network message, not invoke after line:

n2.sendechorequest("hello!") 

i tried using longer sleep time, result same: callback method not invoked m variable didn't value.

log: using verify:

> [info]   org.mockito.exceptions.verification.wantedbutnotinvoked: > wanted not invoked:                                             > [info] dichlistener.echoreqcallback(                                   > [info]     <capturing argument>,                                       > [info]     <capturing argument>                                        > [info] ); 

using when:

> [info]   org.mockito.exceptions.base.mockitoexception: no argument > value captured!                                                > [info] might have forgotten use argument.capture() in > verify()...                                                            > [info] ...or used capture() in stubbing stubbed method not > called.                                                        [info] > aware recommended use capture() verify()    > [info]                                                                 > [info] examples of correct argument capturing:                         > [info]     argumentcaptor<person> argument = > argumentcaptor.forclass(person.class);                                 > [info]     verify(mock).dosomething(argument.capture());               > [info]     assertequals("john", argument.getvalue().getname()); 

edit: n1 connected n2. want send echo_request n2 n1 , check if listener (dl) attach after mocking n1 (n1.listener = dl) fire echoreqcallback. logic working beneath testing code.