public void GetHandler_should_not_remove_from_handlers()
{
var service = new EventHandlerService(null);
A a = new A();
service.PushHandler(a);
var foundHandler = service.GetHandler(typeof(A));
Assert.Same(a, foundHandler);
foundHandler = service.GetHandler(typeof(A));
Assert.Same(a, foundHandler);
}
public void GetHandler_should_return_null_if_handler_not_found_on_stack()
{
var service = new EventHandlerService(null);
service.GetTestAccessor().LastHandlerType = typeof(Button);
service.GetTestAccessor().HandlerHead = CreateStack();
Assert.Null(service.GetHandler(typeof(ComboBox)));
}
public void PopHandler_should_pop_if_handler_found_on_stack()
{
var service = new EventHandlerService(null);
A a = new A();
service.PushHandler(a);
service.PopHandler(a);
Assert.Null(service.GetHandler(typeof(A)));
}
public void GetHandler_should_return_lastHandlerType_if_matches()
{
var service = new EventHandlerService(null);
var handler = new Button();
service.GetTestAccessor().LastHandlerType = typeof(Button);
service.GetTestAccessor().LastHandler = handler;
Assert.Same(handler, service.GetHandler(typeof(Button)));
}
public void GetHandler_should_set_lastHandlerType_if_handler_found_on_stack()
{
var service = new EventHandlerService(null);
service.GetTestAccessor().LastHandlerType = typeof(Button);
service.GetTestAccessor().HandlerHead = CreateStack();
var foundHandler = service.GetHandler(typeof(TextBox));
Assert.Same(typeof(TextBox), service.GetTestAccessor().LastHandlerType);
}
public void GetHandler_should_return_null_if_handler_type_not_found()
{
var service = new EventHandlerService(null);
service.PushHandler("Handler");
// PopHandler asserts when an item isn't found
using (new NoAssertContext())
{
Assert.Null(service.GetHandler(typeof(int)));
}
}
public void GetHandler_should_return_last_inserted_handler_of_type()
{
var service = new EventHandlerService(null);
service.PushHandler(new A());
object second = new A();
service.PushHandler(second);
Assert.Same(second, service.GetHandler(typeof(A)));
}
public void PushHandler_should_set_handlerHead_to_new_handler()
{
var service = new EventHandlerService(null);
A a1 = new A();
service.PushHandler(a1);
A a2 = new A();
service.PushHandler(a2);
Assert.Same(a2, service.GetHandler(typeof(A)));
}
public void GetHandler_should_set_lastHandler_if_handler_found_on_stack()
{
var service = new EventHandlerService(null);
service.GetTestAccessor().LastHandlerType = typeof(Button);
var stackHead = CreateStack();
var handler = stackHead.next.handler;
service.GetTestAccessor().HandlerHead = stackHead;
var foundHandler = service.GetHandler(handler.GetType());
Assert.Same(handler, service.GetTestAccessor().LastHandler);
}
public void GetHandler_should_return_derived_handler_if_found()
{
var service = new EventHandlerService(null);
A a = new A();
service.PushHandler(a);
B b = new B();
service.PushHandler(b);
var foundHandler = service.GetHandler(typeof(A));
Assert.Same(b, foundHandler);
}
public void PopHandler_should_not_pop_if_handler_not_found_on_stack()
{
var service = new EventHandlerService(null);
A a = new A();
service.PushHandler(a);
// PopHandler asserts when an item isn't found
using (new NoAssertContext())
{
service.PopHandler(new B());
}
Assert.Same(a, service.GetHandler(typeof(A)));
}
public void GetHandler_should_return_null_if_lastHandlerType_null()
{
var service = new EventHandlerService(null);
Assert.Null(service.GetHandler(typeof(object)));
}
public void GetHandler_should_throw_if_handlerType_null()
{
var service = new EventHandlerService(null);
Assert.Throws <ArgumentNullException>(() => service.GetHandler(null));
}