public void Transform_ThrowsArgumentException_IfThereIsNoFieldOrPropertyWithName()
{
// Creating the expression "instance.AddNonExistentEvent(handler)"
Expression instance = Expression.Parameter(typeof(Fixture), "instance");
Expression handler = Expression.Parameter(typeof(EventHandler), "handler");
Expression input = Expression.Call(instance, FixtureAddNonExistentEvent, handler);
// Validating that EventAddAttribute fails on non-existent event
EventAddAttribute attribute = new EventAddAttribute("NonExistentEvent");
Assert.ThrowsException <ArgumentException>(() => attribute.Transform(input));
}
public void Transform_ReplacesMethodCallExpressionWithAddAssignExpression_ForFieldEvents()
{
// Creating the expression "instance.AddEvent(handler)"
ParameterExpression instance = Expression.Parameter(typeof(Fixture), "instance");
ParameterExpression handler = Expression.Parameter(typeof(EventHandler), "handler");
Expression input = Expression.Call(instance, FixtureAddEvent, handler);
// Validating that EventAddAttribute creates expression subscribing to Event
Expression output = new EventAddAttribute("Event").Transform(input);
Action <Fixture, EventHandler> addEvent = Expression.Lambda <Action <Fixture, EventHandler> >(output, new[] { instance, handler }).Compile();
bool eventEmitted = false;
Fixture fixture = new Fixture();
EventHandler eventHandler = (sender, e) => eventEmitted = true;
addEvent(fixture, eventHandler);
fixture.TriggerEvent();
Assert.IsTrue(eventEmitted);
}
