public async Task ExecuteNotifiesCanExecuteChanged()
{
var count = 0;
var tcs = new TaskCompletionSource <int>();
using (var command = new AsyncCommand(() => tcs.Task))
{
command.CanExecuteChanged += (_, __) => count++;
var isExecutingCount = 0;
using (command.ObservePropertyChangedSlim(nameof(command.IsExecuting), signalInitial: false)
.Subscribe(_ => isExecutingCount++))
{
Assert.AreEqual(0, isExecutingCount);
Assert.IsFalse(command.IsExecuting);
Assert.IsFalse(command.CancelCommand.CanExecute());
command.Execute();
Assert.AreEqual(1, isExecutingCount);
Assert.IsTrue(command.IsExecuting);
Assert.IsFalse(command.CancelCommand.CanExecute());
Assert.AreEqual(1, count);
tcs.SetResult(1);
await command.Execution.Task.ConfigureAwait(false);
Assert.AreEqual(2, isExecutingCount);
Assert.IsFalse(command.IsExecuting);
Assert.AreEqual(2, count);
}
}
}