public void TestCanExecute_ShouldReturnTrue_IfActualCommandCanExecute()
{
ICommand command = new DelegateCommand(delegate { }); //command cannot execute as action is not null
command = new CommandDecoratorStub(command);
Assert.IsTrue(command.CanExecute(null));
}
public void TestCanExecute_ShouldReturnFalse_IfActualCommandCannotExecute()
{
ICommand command = new DelegateCommand(null); //command cannot execute as its action is null
command = new CommandDecoratorStub(command);
Assert.IsFalse(command.CanExecute(null));
}
public void TestCanExecuteChanged_ShouldBeAbleToSubscribeThisEventFromDecorator()
{
var command = new DelegateCommand(null);
var decoratedCommand = new CommandDecoratorStub(command);
bool raised = false;
EventHandler handler = (sender, args) => raised = true;
decoratedCommand.CanExecuteChanged += handler;
command.Action = delegate { }; //This will cause CanExecuteChanged raise from actual command
Assert.IsTrue(raised); //Should be able to subscrib this event from the decorator
}
public void TestCanExecuteChanged_ShouldBeAbleToUnSubscribeThisEventFromDecorator()
{
var command = new DelegateCommand(null);
var decoratedCommand = new CommandDecoratorStub(command);
bool raised = false;
EventHandler handler = (sender, args) => raised = true;
decoratedCommand.CanExecuteChanged += handler;
decoratedCommand.CanExecuteChanged -= handler;
command.Action = delegate { };
Assert.IsFalse(raised);
}
