Raising delegate (non-EventHandler) events

[dtchepak]

Event is declared as delegate (i.e. not an EventHandler). So can't use Raise.Action or Raise.Event.

    [Test]
    public void CanRaiseNotifyPropertyChangedEvent()
    {
        var sub = Substitute.For<INotifyPropertyChanged>();
        sub.PropertyChanged += Raise.Event(); // <---Won't compile
    }

Another example is: _AppDomain.UnhandledException event

[dtchepak]

Can force an overload to be called that returns delegatecallwrapper:

    [Test]
    public void CanRaiseNotifyPropertyChangedEvent()
    {
        var sub = Substitute.For<INotifyPropertyChanged>();
        var wasRaised = false;
        sub.PropertyChanged += (sender, args) => wasRaised = true;
        sub.PropertyChanged += Raise.Event<PropertyChangedEventHandler>(this, new PropertyChangedEventArgs("test"));
        Assert.That(wasRaised);
    }

Probably need a more obvious way to calls these (possibly with arg defaults/detection?). Unfortunately generic constraints can't constrain to delegate types, so may need to introduce Raise.DelegateEvent(...) or similar.

Another option is to make the current arg defaulting more robust, and let the dev cast the delegate to the correct type (adding cast to EventHandlerWrapper).

[dtchepak]

Fixed over multiple commits, ending with 0b6739.