public void ShouldThrowIfExecuteMethodDelegateNull()
{
Assert.Throws <ArgumentNullException>(
() =>
{
var command = new CanExecuteObserverCommand(null);
});
}
public void RelayCommandThrowsIfExecuteDelegateIsNull()
{
Assert.Throws <ArgumentNullException>(
() =>
{
var command = new CanExecuteObserverCommand(null);
});
}
public void CanExecuteReturnsTrueWithoutCanExecuteDelegate()
{
var handlers = new DelegateHandlers();
var command = new CanExecuteObserverCommand(handlers.Execute);
var condition = command.CanExecute();
Assert.True(condition);
}
public void RelayCommandExecuteShouldInvokeExecuteAction()
{
var executed = false;
var command = new CanExecuteObserverCommand(() => executed = true) as ICommand;
command.Execute(new object());
Assert.True(executed);
}
public void RaiseCanExecuteWithExceptionChangedNoRaiseCanExecuteChanged()
{
var handlers = new DelegateHandlers();
var command = new CanExecuteObserverCommand(handlers.Execute, () => true);
var canExecuteChangedRaised = false;
command.CanExecuteChanged += delegate { canExecuteChangedRaised = true; };
Assert.False(canExecuteChangedRaised);
}
public void CanExecuteCallsPassedInCanExecuteDelegate()
{
var handlers = new DelegateHandlers();
var command = new CanExecuteObserverCommand(handlers.Execute, handlers.CanExecute);
handlers.CanExecuteReturnValue = true;
var actual = command.CanExecute();
Assert.AreEqual(handlers.CanExecuteReturnValue, actual);
}
public void RelayCommandNotObservingPropertiesShouldNotRaiseOnEmptyPropertyName()
{
var canExecuteChangedRaised = false;
var commandTestObject = new CommandTestObject();
var command = new CanExecuteObserverCommand(() => { });
command.CanExecuteChanged += delegate { canExecuteChangedRaised = true; };
commandTestObject.RaisePropertyChanged(null);
Assert.False(canExecuteChangedRaised);
}
public void RaiseCanExecuteChangedRaisesCanExecuteChanged()
{
var canExecuteChangedRaised = false;
var handlers = new DelegateHandlers();
var command = new CanExecuteObserverCommand(handlers.Execute, () => false);
command.CanExecuteChanged += delegate { canExecuteChangedRaised = true; };
CommandManager.InvalidateRequerySuggested();
Dispatcher.CurrentDispatcher.Invoke(DispatcherPriority.Background, new Action(() => { }));
Assert.True(canExecuteChangedRaised);
}
public void CanRemoveCanExecuteChangedHandler()
{
var command = new CanExecuteObserverCommand(() => { });
var canExecuteChangedRaised = false;
void Handler(object s, EventArgs e) => canExecuteChangedRaised = true;
command.CanExecuteChanged += Handler;
command.CanExecuteChanged -= Handler;
CommandManager.InvalidateRequerySuggested();
Dispatcher.CurrentDispatcher.Invoke(DispatcherPriority.Background, new Action(() => { }));
Assert.False(canExecuteChangedRaised);
}
public void RelayCommandCanExecuteShouldInvokeCanExecuteFunc()
{
var invoked = false;
var command = new CanExecuteObserverCommand(
() => { },
() =>
{
invoked = true;
return(true);
});
var canExecute = command.CanExecute();
Assert.True(invoked);
Assert.True(canExecute);
}
