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ActivationTests.cs
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using System;
using System.Linq;
using System.Reactive;
using System.Reactive.Disposables;
using System.Reactive.Linq;
using System.Reactive.Subjects;
using Splat;
using Xunit;
namespace ReactiveUI.Tests
{
public class ActivatingViewModel : ReactiveObject, ISupportsActivation
{
public ViewModelActivator Activator { get; protected set; }
public int IsActiveCount { get; protected set; }
public ActivatingViewModel()
{
Activator = new ViewModelActivator();
this.WhenActivated(d => {
IsActiveCount++;
d(Disposable.Create(() => IsActiveCount--));
});
}
}
public class DerivedActivatingViewModel : ActivatingViewModel
{
public int IsActiveCountAlso { get; protected set; }
public DerivedActivatingViewModel()
{
this.WhenActivated(d => {
IsActiveCountAlso++;
d(Disposable.Create(() => IsActiveCountAlso--));
});
}
}
public class ActivatingView : ReactiveObject, IViewFor<ActivatingViewModel>
{
ActivatingViewModel viewModel;
public ActivatingViewModel ViewModel
{
get { return viewModel; }
set { this.RaiseAndSetIfChanged(ref viewModel, value); }
}
object IViewFor.ViewModel
{
get { return ViewModel; }
set { ViewModel = (ActivatingViewModel)value; }
}
public ActivatingView()
{
this.WhenActivated(d => {
IsActiveCount++;
d(Disposable.Create(() => IsActiveCount--));
});
}
public int IsActiveCount { get; set; }
public Subject<Unit> Loaded = new Subject<Unit>();
public Subject<Unit> Unloaded = new Subject<Unit>();
}
public class ActivatingViewFetcher : IActivationForViewFetcher
{
public int GetAffinityForView(Type view)
{
return view == typeof(ActivatingView) ? 100 : 0;
}
public IObservable<bool> GetActivationForView(IActivatable view)
{
var av = view as ActivatingView;
return av.Loaded.Select(_ => true).Merge(av.Unloaded.Select(_ => false));
}
}
public class ActivatingViewModelTests
{
[Fact]
public void ActivationsGetRefCounted()
{
var fixture = new ActivatingViewModel();
Assert.Equal(0, fixture.IsActiveCount);
fixture.Activator.Activate();
Assert.Equal(1, fixture.IsActiveCount);
fixture.Activator.Activate();
Assert.Equal(1, fixture.IsActiveCount);
fixture.Activator.Deactivate();
Assert.Equal(1, fixture.IsActiveCount);
// Refcount drops to zero
fixture.Activator.Deactivate();
Assert.Equal(0, fixture.IsActiveCount);
}
[Fact]
public void DerivedActivationsDontGetStomped()
{
var fixture = new DerivedActivatingViewModel();
Assert.Equal(0, fixture.IsActiveCount);
Assert.Equal(0, fixture.IsActiveCountAlso);
fixture.Activator.Activate();
Assert.Equal(1, fixture.IsActiveCount);
Assert.Equal(1, fixture.IsActiveCountAlso);
fixture.Activator.Activate();
Assert.Equal(1, fixture.IsActiveCount);
Assert.Equal(1, fixture.IsActiveCountAlso);
fixture.Activator.Deactivate();
Assert.Equal(1, fixture.IsActiveCount);
Assert.Equal(1, fixture.IsActiveCountAlso);
fixture.Activator.Deactivate();
Assert.Equal(0, fixture.IsActiveCount);
Assert.Equal(0, fixture.IsActiveCountAlso);
}
}
public class ActivatingViewTests
{
[Fact]
public void ActivatingViewSmokeTest()
{
var locator = new ModernDependencyResolver();
locator.InitializeSplat();
locator.InitializeReactiveUI();
locator.Register(() => new ActivatingViewFetcher(), typeof(IActivationForViewFetcher));
using (locator.WithResolver()) {
var vm = new ActivatingViewModel();
var fixture = new ActivatingView();
fixture.ViewModel = vm;
Assert.Equal(0, vm.IsActiveCount);
Assert.Equal(0, fixture.IsActiveCount);
fixture.Loaded.OnNext(Unit.Default);
Assert.Equal(1, vm.IsActiveCount);
Assert.Equal(1, fixture.IsActiveCount);
fixture.Unloaded.OnNext(Unit.Default);
Assert.Equal(0, vm.IsActiveCount);
Assert.Equal(0, fixture.IsActiveCount);
}
}
[Fact]
public void NullingViewModelShouldDeactivateIt()
{
var locator = new ModernDependencyResolver();
locator.InitializeSplat();
locator.InitializeReactiveUI();
locator.Register(() => new ActivatingViewFetcher(), typeof(IActivationForViewFetcher));
using (locator.WithResolver()) {
var vm = new ActivatingViewModel();
var fixture = new ActivatingView();
fixture.ViewModel = vm;
Assert.Equal(0, vm.IsActiveCount);
Assert.Equal(0, fixture.IsActiveCount);
fixture.Loaded.OnNext(Unit.Default);
Assert.Equal(1, vm.IsActiveCount);
Assert.Equal(1, fixture.IsActiveCount);
fixture.ViewModel = null;
Assert.Equal(0, vm.IsActiveCount);
}
}
[Fact]
public void SwitchingViewModelShouldDeactivateIt()
{
var locator = new ModernDependencyResolver();
locator.InitializeSplat();
locator.InitializeReactiveUI();
locator.Register(() => new ActivatingViewFetcher(), typeof(IActivationForViewFetcher));
using (locator.WithResolver()) {
var vm = new ActivatingViewModel();
var fixture = new ActivatingView();
fixture.ViewModel = vm;
Assert.Equal(0, vm.IsActiveCount);
Assert.Equal(0, fixture.IsActiveCount);
fixture.Loaded.OnNext(Unit.Default);
Assert.Equal(1, vm.IsActiveCount);
Assert.Equal(1, fixture.IsActiveCount);
var newVm = new ActivatingViewModel();
Assert.Equal(0, newVm.IsActiveCount);
fixture.ViewModel = newVm;
Assert.Equal(0, vm.IsActiveCount);
Assert.Equal(1, newVm.IsActiveCount);
}
}
[Fact]
public void SettingViewModelAfterLoadedShouldLoadIt()
{
var locator = new ModernDependencyResolver();
locator.InitializeSplat();
locator.InitializeReactiveUI();
locator.Register(() => new ActivatingViewFetcher(), typeof(IActivationForViewFetcher));
using (locator.WithResolver()) {
var vm = new ActivatingViewModel();
var fixture = new ActivatingView();
Assert.Equal(0, vm.IsActiveCount);
Assert.Equal(0, fixture.IsActiveCount);
fixture.Loaded.OnNext(Unit.Default);
Assert.Equal(1, fixture.IsActiveCount);
fixture.ViewModel = vm;
Assert.Equal(1, fixture.IsActiveCount);
Assert.Equal(1, vm.IsActiveCount);
fixture.Unloaded.OnNext(Unit.Default);
Assert.Equal(0, fixture.IsActiveCount);
Assert.Equal(0, vm.IsActiveCount);
}
}
[Fact]
public void CanUnloadAndLoadViewAgain()
{
var locator = new ModernDependencyResolver();
locator.InitializeSplat();
locator.InitializeReactiveUI();
locator.Register(() => new ActivatingViewFetcher(), typeof(IActivationForViewFetcher));
using (locator.WithResolver()) {
var vm = new ActivatingViewModel();
var fixture = new ActivatingView();
fixture.ViewModel = vm;
Assert.Equal(0, vm.IsActiveCount);
Assert.Equal(0, fixture.IsActiveCount);
fixture.Loaded.OnNext(Unit.Default);
Assert.Equal(1, vm.IsActiveCount);
Assert.Equal(1, fixture.IsActiveCount);
fixture.Unloaded.OnNext(Unit.Default);
Assert.Equal(0, vm.IsActiveCount);
Assert.Equal(0, fixture.IsActiveCount);
fixture.Loaded.OnNext(Unit.Default);
Assert.Equal(1, vm.IsActiveCount);
Assert.Equal(1, fixture.IsActiveCount);
}
}
}
public class ViewModelActivatorTests
{
[Fact]
public void ActivatingTicksActivatedObservable()
{
var viewModelActivator = new ViewModelActivator();
var activated = viewModelActivator.Activated.CreateCollection();
viewModelActivator.Activate();
Assert.Equal(1, activated.Count);
}
[Fact]
public void DeactivatingIgnoringRefCountTicksDeactivatedObservable()
{
var viewModelActivator = new ViewModelActivator();
var deactivated = viewModelActivator.Deactivated.CreateCollection();
viewModelActivator.Deactivate(true);
Assert.Equal(1, deactivated.Count);
}
[Fact]
public void DeactivatingCountDoesntTickDeactivatedObservable()
{
var viewModelActivator = new ViewModelActivator();
var deactivated = viewModelActivator.Deactivated.CreateCollection();
viewModelActivator.Deactivate(false);
Assert.Equal(0, deactivated.Count);
}
[Fact]
public void DeactivatingFollowingActivatingTicksDeactivatedObservable()
{
var viewModelActivator = new ViewModelActivator();
var deactivated = viewModelActivator.Deactivated.CreateCollection();
viewModelActivator.Activate();
viewModelActivator.Deactivate(false);
Assert.Equal(1, deactivated.Count);
}
}
public class CanActivateViewFetcherTests
{
private class CanActivateStub : ICanActivate
{
public IObservable<Unit> Activated { get; }
public IObservable<Unit> Deactivated { get; }
}
[Fact]
public void ReturnsPositiveForICanActivate()
{
var canActivateViewFetcher = new CanActivateViewFetcher();
var affinity = canActivateViewFetcher.GetAffinityForView(typeof(ICanActivate));
Assert.True(affinity > 0);
}
[Fact]
public void ReturnsPositiveForICanActivateDerivatives()
{
var canActivateViewFetcher = new CanActivateViewFetcher();
var affinity = canActivateViewFetcher.GetAffinityForView(typeof(CanActivateStub));
Assert.True(affinity > 0);
}
[Fact]
public void ReturnsZeroForNonICanActivateDerivatives()
{
var canActivateViewFetcher = new CanActivateViewFetcher();
var affinity = canActivateViewFetcher.GetAffinityForView(typeof(CanActivateViewFetcherTests));
Assert.Equal(0, affinity);
}
}
}