public void StopOperation_EntersCanceledState()
{
var command = new CancelCommand();
var operation = command.StartOperation();
var token = command.CancellationToken;
object observedSender = null;
bool observedCanExecute = true;
EventHandler subscription = (s, _) =>
{
observedSender = s;
observedCanExecute = ((ICommand)command).CanExecute(null);
};
((ICommand)command).CanExecuteChanged += subscription;
operation.Dispose();
Assert.True(token.IsCancellationRequested);
Assert.True(command.CancellationToken.IsCancellationRequested);
Assert.True(command.IsCancellationRequested);
Assert.False(((ICommand)command).CanExecute(null));
Assert.Same(command, observedSender);
Assert.False(observedCanExecute);
((ICommand)command).CanExecuteChanged -= subscription;
}
public void Operations_AreReferenceCounted()
{
var command = new CancelCommand();
var operation1 = command.StartOperation();
var operation2 = command.StartOperation();
operation2.Dispose();
Assert.False(command.CancellationToken.IsCancellationRequested);
Assert.False(command.IsCancellationRequested);
Assert.True(((ICommand)command).CanExecute(null));
operation1.Dispose();
Assert.True(command.CancellationToken.IsCancellationRequested);
Assert.True(command.IsCancellationRequested);
Assert.False(((ICommand)command).CanExecute(null));
}