public async Task ExecuteNotifiesTaskStatus()
{
// http://stackoverflow.com/questions/34811639/is-there-a-way-to-be-notified-when-task-status-changes-to-running
var tcs = new TaskCompletionSource <int>();
using (var command = new AsyncCommand(() => tcs.Task))
{
var taskStatuses = new List <TaskStatus>();
using (command.ObservePropertyChangedWithValue(x => x.Execution.Status)
.Subscribe(x => taskStatuses.Add(x.EventArgs.Value)))
{
Assert.IsFalse(command.IsExecuting);
Assert.IsFalse(command.CancelCommand.CanExecute());
command.Execute();
Assert.IsTrue(command.IsExecuting);
Assert.IsFalse(command.CancelCommand.CanExecute());
var expectedStatuses = new List <TaskStatus> {
TaskStatus.Created, TaskStatus.WaitingForActivation, TaskStatus.Running,
};
CollectionAssert.AreEqual(expectedStatuses, taskStatuses);
tcs.SetResult(1);
await command.Execution.Task.ConfigureAwait(false);
Assert.IsFalse(command.IsExecuting);
expectedStatuses.Add(TaskStatus.RanToCompletion);
CollectionAssert.AreEqual(expectedStatuses, taskStatuses);
}
}
}