public void It_Raises_CanExecute_When_Property_Changes()
{
var canExecute = true;
var property = new DynamicProperty <bool>(DefaultPropertyName, false);
var testStrategy = new TestCommandStrategy();
var strategy = new CanExecuteCommandStrategy(property)
{
InnerStrategy = testStrategy
};
var command = new DynamicCommand(DefaultCommandName, strategy);
command.CanExecuteChanged += OnCanExecuteChanged;
canExecute = command.CanExecute(null);
canExecute.Should().BeFalse();
property.Value = true;
canExecute.Should().BeTrue();
property.Value = false;
canExecute.Should().BeFalse();
void OnCanExecuteChanged(object sender, EventArgs e)
{
canExecute = command.CanExecute(null);
}
}
public async Task It_Disables_While_Executing()
{
var taskCompletionSource = new TaskCompletionSource <object>();
var testStrategy = new TestCommandStrategy(
onExecute: (_, __, ___) => taskCompletionSource.Task
);
var strategy = new DisableWhileExecutingCommandStrategy()
{
InnerStrategy = testStrategy
};
var command = new DynamicCommand(DefaultCommandName, strategy);
command.CanExecuteChanged += OnCanExecuteChanged;
var canExecute = command.CanExecute(null);
// The command should be enabled
canExecute.Should().BeTrue();
// We execute the command
var commandExecution = command.Execute();
// The command should be disabled
canExecute.Should().BeFalse();
// The command completes
taskCompletionSource.TrySetResult(null);
await commandExecution;
// The command should be enabled
canExecute.Should().BeTrue();
void OnCanExecuteChanged(object sender, EventArgs e)
{
canExecute = command.CanExecute(null);
}
}