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 PopHandler_should_set_lastHandlerType_null_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;
service.PopHandler(handler);
Assert.Null(service.GetTestAccessor().LastHandlerType);
}
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 PopHandler_should_raise_changedEvent_if_handler_found_on_stack()
{
var service = new EventHandlerService(null);
A a = new A();
service.PushHandler(a);
int callCount = 0;
service.EventHandlerChanged += (s, e) => { callCount++; };
service.PopHandler(a);
Assert.Equal(1, callCount);
}
public void PopHandler_should_raise_changedEvent_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;
int callCount = 0;
service.EventHandlerChanged += (s, e) => { callCount++; };
service.PopHandler(handler);
Assert.Equal(1, callCount);
}
public void PopHandler_should_pop_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;
service.PopHandler(handler);
var depth = 0;
for (HandlerEntry entry = service.GetTestAccessor().HandlerHead; entry != null; entry = entry.next)
{
depth++;
}
Assert.Equal(1, depth);
}
public void PopHandler_should_not_pop_if_handler_not_found_on_stack()
{
// we expect to hit Debug.Assert and unless we clear listeners we will crash to xUnit runner:
// "The active test run was aborted. Reason: Test host process crashed : Assertion Failed"
using (new TraceListenerlessContext())
{
var service = new EventHandlerService(null);
service.GetTestAccessor().LastHandlerType = typeof(Button);
var stackHead = CreateStack();
service.GetTestAccessor().HandlerHead = stackHead;
service.PopHandler(typeof(ComboBox));
var depth = 0;
for (HandlerEntry entry = service.GetTestAccessor().HandlerHead; entry != null; entry = entry.next)
{
depth++;
}
Assert.Equal(3, depth);
}
}
public void PopHandler_should_not_throw_if_stack_empty()
{
var service = new EventHandlerService(null);
service.PopHandler(typeof(ComboBox));
}
public void PopHandler_should_throw_if_handler_null()
{
var service = new EventHandlerService(null);
Assert.Throws <ArgumentNullException>(() => service.PopHandler(null));
}