public void Transform_ThrowsArgumentException_IfThereIsNoFieldOrPropertyWithName()
{
// Creating the expression "instance.RemoveNonExistentDelegate(handler)"
Expression instance = Expression.Parameter(typeof(Fixture), "instance");
Expression handler = Expression.Parameter(typeof(Action), "handler");
Expression input = Expression.Call(instance, FixtureRemoveNonExistentDelegate, handler);
// Validating that DelegateRemoveAttribute fails on non-existent field or property
DelegateRemoveAttribute attribute = new DelegateRemoveAttribute("NonExistentDelegate");
Assert.ThrowsException <ArgumentException>(() => attribute.Transform(input));
}
public void Transform_ReplacesMethodCallExpressionWithAddAssignExpression_ForPropertyEvents()
{
// Creating the expression "instance.RemovePropertyDelegate(handler)"
ParameterExpression instance = Expression.Parameter(typeof(Fixture), "instance");
ParameterExpression handler = Expression.Parameter(typeof(Action), "handler");
Expression input = Expression.Call(instance, FixtureRemovePropertyDelegate, handler);
// Validating that DelegateAddAttribute creates expression unsubscribing to PropertyDelegate
Expression output = new DelegateRemoveAttribute("PropertyDelegate").Transform(input);
Action <Fixture, Action> removePropertyDelegate = Expression.Lambda <Action <Fixture, Action> >(output, new[] { instance, handler }).Compile();
Fixture fixture = new Fixture();
Action action = () => { };
fixture.PropertyDelegate += action;
removePropertyDelegate(fixture, action);
Assert.IsNull(fixture.PropertyDelegate);
}