c# - Waiting for all the threads spawned by async method while unit Testing -

i unit testing viewmodel in wpf application , there delegate command calls method further calls async method inside . have wait every task finished before calling assert statement. method called delegate command :

private void methodcalled() {     this.uiservice.setbusystate();     uiexecutehelper executehelper = new uiexecutehelper(viewname.window);     executehelper.executeasync(() =>         {             // stuff              method1();          } } 

now waiting method in following way in unit test:

try {     var task = task.factory.startnew(() =>         {             classobj.delegatecommand.execute();         });     var aftertask = task.continuewith((myobject)=>         {             classobj.load();             assert.areequal(true, someflag);         }, taskcontinuationoptions.onlyonrantocompletion);  } 

but still not waiting inner tasks spawned finished. please suggest

there delegate command calls method further calls async method inside it.

@jimwooley correctly identified root of problem. 1 of reasons avoid async void because async void methods not (easily) testable.

the best solution suggested:

• factor actual logic of command separate, task-returning method.
• within delegate command, await method.
• your unit tests can call async task method rather invoking delegate command.

however, if insist on doing hard way, you'll need install custom synchronizationcontext , track number of asynchronous operations. or can use asynccontext type you:

await asynccontext.run(() => classobj.delegatecommand.execute()); classobj.load(); assert.areequal(true, someflag);