Unit testing Service Fabric Reliable Service and Actors with Mocks and Moqs

Install-Package Moq
Install-Package ServiceFabric.Mocks

Some key bits of code you'll need:

this.mockRepository = new MockRepository(MockBehavior.Strict);

var statefulServiceContext = MockStatefulServiceContextFactory.Create(
codePackageActivationContext: this.mockRepository.Create<ICodePackageActivationContext>().Object,
serviceTypeName: String.Concat(typeof(MyActorService).Name, "Type"),
serviceName: new Uri("fabric:/MockApplicationType/MyActorServiceType"),
partitionId: Guid.NewGuid(),
replicaId: 1
);

this.mockServiceDependencyThing = this.mockRepository.Create<IServiceDependencyThing>();

MockActorService<MyActorService> actorServiceForActor = MockActorServiceFactory.CreateActorServiceForActor<MyActorService>((actorService, actorId) => new MyActorService(actorService, actorId, this.mockServiceDependencyThing.Object));

this.sut = new MyActorService(actorServiceForActor, new ActorId(Guid.NewGuid()), this.mockServiceDependencyThing.Object);