public void Transform_ThrowsArgumentException_IfThereIsNoFieldOrPropertyWithName()
{
// Creating the expression "instance.AddNonExistentDelegate(handler)"
Expression instance = Expression.Parameter(typeof(Fixture), "instance");
Expression handler = Expression.Parameter(typeof(Action), "handler");
Expression input = Expression.Call(instance, FixtureAddNonExistentDelegate, handler);
// Validating that DelegateAddAttribute fails on non-existent field or property
DelegateAddAttribute attribute = new DelegateAddAttribute("NonExistentMember");
Assert.ThrowsException <ArgumentException>(() => attribute.Transform(input));
}
public void Transform_ReplacesMethodCallExpressionWithAddAssignExpression_ForPropertyEvents()
{
// Creating the expression "instance.AddPropertyDelegate(handler)"
ParameterExpression instance = Expression.Parameter(typeof(Fixture), "instance");
ParameterExpression handler = Expression.Parameter(typeof(Action), "handler");
Expression input = Expression.Call(instance, FixtureAddPropertyDelegate, handler);
// Validating that DelegateAddAttribute creates expression subscribing to PropertyDelegate
Expression output = new DelegateAddAttribute("PropertyDelegate").Transform(input);
Action <Fixture, Action> addPropertyDelegate = Expression.Lambda <Action <Fixture, Action> >(output, new[] { instance, handler }).Compile();
Fixture fixture = new Fixture();
Action action = () => { };
addPropertyDelegate(fixture, action);
CollectionAssert.Contains(fixture.PropertyDelegate.GetInvocationList(), action);
}