public async Task AddCompletionCallback_ContinuationsRunOnCorrectSynchronozationContext()
{
// Arrange
var op = new AsyncCompletionSource();
var op2 = new AsyncCompletionSource();
var sc = Substitute.For <SynchronizationContext>();
var tid = 0;
var tidActual = 0;
op.AddCompletionCallback(new Action(() => { }), sc);
op2.AddCompletionCallback(new Action(() => tidActual = Thread.CurrentThread.ManagedThreadId), null);
// Act
await Task.Run(() => op.SetCompleted());
await Task.Run(() => { tid = Thread.CurrentThread.ManagedThreadId; op2.SetCompleted(); });
// Assert
sc.Received(1).Post(Arg.Any <SendOrPostCallback>(), Arg.Any <object>());
Assert.Equal(tid, tidActual);
}
