Is Unit Testing ReactiveProperties Possible?

[kgc00]

Hi,

Is it possible to Unit Test reactive properties? I've got a simple sandbox with:

    public class ReactiveThing {
        public ReactiveProperty<int> rpInt { get; private set; }
        public SomeModel Model;
        public ReactiveThing() {
            Model = new SomeModel();
            rpInt = ReactiveProperty.FromObject(Model, x => x.someInt);
        }
    }

    public class SomeModel {
        public int someInt { get; set; }
        public void Update() => someInt += 1;
    }

        [Test]
        public void Board_Has_Observable() {
            var rt = new ReactiveThing();

            rt.Model.Update();
            rt.Model.Update();

            rt.rpInt.Value.ShouldBe(2);
        }

But my test fails with:

Shouldly.ShouldAssertException : rt.copyOfObservale.Value
    should be
2
    but was
0

Do tests need to be structured in some kind of way to facilitate reactive proprty updates?

[runceel]

@kgc00 FromObject method works as 'one way to source binding'. In this case, the source is SomeModel class, the target is the Reactiveproperty instance.

If you want to sync between SomeModel and ReactiveProperty, then you have to implement INotifyPropertyChanged interface to SomeModel, and then change ReactiveThing class like below:

    public class ReactiveThing {
        public ReactiveProperty<int> rpInt { get; private set; }
        public SomeModel Model;
        public ReactiveThing() {
            Model = new SomeModel();
            // ObserveProperty is defined as an extension method of INotifyPropertyChanged interface
            rpInt = Model.ObserveProperty(x => x.someInt).ToReactiveProperty();
        }
    }

[runceel]

@kgc00 I have created a sample project. Please check the following link: https://github.com/runceel/Issue212/blob/master/Issue212/UnitTest1.cs

[kgc00]

Hi @runceel,

I see now what I was doing wrong. Thanks for the help!

[runceel]

@kgc00 No problem.