public async Task Test_AsyncRelayCommand_AlwaysEnabled()
{
int ticks = 0;
var command = new AsyncRelayCommand(async() =>
{
await Task.Delay(1000);
ticks++;
await Task.Delay(1000);
});
Assert.IsTrue(command.CanExecute(null));
Assert.IsTrue(command.CanExecute(new object()));
Assert.IsFalse(command.CanBeCanceled);
Assert.IsFalse(command.IsCancellationRequested);
(object, EventArgs)args = default;
command.CanExecuteChanged += (s, e) => args = (s, e);
command.NotifyCanExecuteChanged();
Assert.AreSame(args.Item1, command);
Assert.AreSame(args.Item2, EventArgs.Empty);
Assert.IsNull(command.ExecutionTask);
Assert.IsFalse(command.IsRunning);
Task task = command.ExecuteAsync(null);
Assert.IsNotNull(command.ExecutionTask);
Assert.AreSame(command.ExecutionTask, task);
Assert.IsTrue(command.IsRunning);
await task;
Assert.IsFalse(command.IsRunning);
Assert.AreEqual(ticks, 1);
command.Execute(new object());
await command.ExecutionTask !;
Assert.AreEqual(ticks, 2);
}
public async Task Test_AsyncRelayCommandOfT_AlwaysEnabled()
{
int ticks = 0;
var command = new AsyncRelayCommand <string>(async s =>
{
await Task.Delay(1000);
ticks = int.Parse(s);
await Task.Delay(1000);
});
Assert.IsTrue(command.CanExecute(null));
Assert.IsTrue(command.CanExecute("1"));
(object, EventArgs)args = default;
command.CanExecuteChanged += (s, e) => args = (s, e);
command.NotifyCanExecuteChanged();
Assert.AreSame(args.Item1, command);
Assert.AreSame(args.Item2, EventArgs.Empty);
Assert.IsNull(command.ExecutionTask);
Assert.IsFalse(command.IsRunning);
Task task = command.ExecuteAsync((object)"42");
Assert.IsNotNull(command.ExecutionTask);
Assert.AreSame(command.ExecutionTask, task);
Assert.IsTrue(command.IsRunning);
await task;
Assert.IsFalse(command.IsRunning);
Assert.AreEqual(ticks, 42);
command.Execute("2");
await command.ExecutionTask !;
Assert.AreEqual(ticks, 2);
Assert.ThrowsException <InvalidCastException>(() => command.Execute(new object()));
}