public async Task ViewModel_WhenRefreshed_ShouldDisposePreviousNotificationsSubscriptions(
IFixture fixture,
TestSchedulers scheduler,
int[] values)
{
//arrange
var notifications = scheduler.CreateColdObservable<int>();
var sut = new UpdatableObservableViewModelBuilderOptions<int, int[], int>(
_ => { },
ct => Task.FromResult(values),
() => notifications,
scheduler,
scheduler,
scheduler)
.UpdateAction((i, o) => () => { })
.ToViewModel();
const long disposeTime = 805;
//act
scheduler.Start();
await sut.RefreshAsync();
//we advance to an arbitrary time
scheduler.AdvanceBy(disposeTime);
//the subscription to the new observable should happen here
//the first subscription should be dispose at the current scheduler time
await sut.RefreshAsync();
//assert
notifications.Subscriptions[0].Unsubscribe.Should().Be(disposeTime);
}
public async Task ViewModel_ShouldReturnCorrectValue(
IFixture fixture,
TestSchedulers scheduler)
{
//arrange
const int insertionIndex = 5;
var initialList = fixture.CreateMany<int>(10).ToArray();
var addedList = fixture.CreateMany<int>(10).ToArray();
var expected = initialList.Take(insertionIndex)
.Concat(addedList.Reverse())
.Concat(initialList.Skip(insertionIndex))
.ToArray();
var notifications = scheduler.CreateColdObservable(addedList.Select((i, ii) => OnNext(Subscribed + 1 + ii, i)).ToArray());
var sut = new UpdatableObservableViewModelBuilderOptions<int, int[], int>(
_ => { },
ct => Task.FromResult(initialList),
() => notifications,
scheduler,
scheduler,
scheduler)
.UpdateAction((i, o) => () => o.Insert(insertionIndex, i))
.ToViewModel();
//act
scheduler.Start();
await sut.RefreshAsync();
scheduler.AdvanceBy(Disposed);
var actual = ((IObservableViewModel<ObservableCollection<int>>)sut).CurrentValue;
//assert
actual.ShouldAllBeEquivalentTo(expected);
}
public async Task ViewModel_WhenError_WithRefreshOnCollectionUpdateNotification_ShouldRefresh(
IFixture fixture,
TestSchedulers scheduler,
int[] expectedValue)
{
//arrange
var notifications = scheduler.CreateColdObservable(OnNext(200, 1));
var observer = scheduler.CreateObserver<ObservableViewModelNotification>();
var count = 0;
var sut = new UpdatableObservableViewModelBuilderOptions<int, int[], int>(
_ => { },
async ct =>
{
if (++count == 1)
throw new Exception();
else
return expectedValue;
},
() => notifications,
scheduler,
scheduler,
scheduler)
.UpdateAction((i, o) => () => { })
.RefreshOnCollectionUpdateNotification()
.ToViewModel();
sut.Subscribe(observer);
//act
await sut.RefreshAsync();
scheduler.AdvanceBy(300);
//assert
observer.Values().Last().Value.As<ObservableCollection<int>>().ShouldAllBeEquivalentTo(expectedValue);
}
public void Execute_WithError_ShouldExecuteErrorTask(
object obj,
Exception expected,
TestSchedulers schedulers)
{
//arrange
Exception actual = null;
var value = Observable.Throw<object>(expected, ImmediateScheduler.Instance);
Func<CancellationToken, Exception, Task> errorTask = async (ct, ex) => actual = ex;
var sut = new ObservableMvvmCommand<object, object>(_ => value, schedulers, schedulers, "name", new AlwaysTrueCanExecuteStrategy<object>(), errorTask: errorTask);
//act
sut.Execute(obj);
schedulers.AdvanceBy(200);
//assert
actual.Should().Be(expected);
}
public void Execute_ShouldBeCalledWithArg(
IObservable<object> value,
object arg,
TestSchedulers schedulers)
{
//arrange
object actual = null;
var sut = new ObservableMvvmCommand<object, object>(o =>
{
actual = o;
return value;
},
schedulers,
schedulers,
"name",
new AlwaysTrueCanExecuteStrategy<object>());
//act
sut.Execute(arg);
schedulers.AdvanceBy(200);
//assert
actual.Should().Be(arg);
}
public void Execute_WhenErrorInErrorAction_ShouldCallNotifyNotExecuting(
Mock<ICanExecuteStrategy<object>> canExecute,
Exception error,
object obj,
TestSchedulers schedulers)
{
//arrange
var value = Observable.Throw<object>(error, ImmediateScheduler.Instance);
Func<CancellationToken, Exception, Task> errorTask = async (ct, ex) =>
{
throw new Exception();
};
var sut = new ObservableMvvmCommand<object, object>(_ => value, schedulers, schedulers, "name", canExecute.Object, errorTask: errorTask);
//act
sut.Execute(obj);
schedulers.AdvanceBy(200);
//assert
canExecute.Verify(c => c.NotifyNotExecuting(obj), Times.Once());
}
public void Execute_WithObservableYielding3Values_ShouldReturnCorrectResult(
object value1,
object value2,
object value3,
TestSchedulers schedulers,
ThrowingTestScheduler scheduler)
{
//arrange
var observable = scheduler.CreateColdObservable(OnNext(10, value1),
OnNext(20, value2),
OnNext(30, value3),
OnCompleted(40, new object()));
var observer = scheduler.CreateObserver<object>();
var sut = new ObservableMvvmCommand<object, object>(o => observable, schedulers, schedulers, "name", new AlwaysTrueCanExecuteStrategy<object>(), doObserver: () => observer, doScheduler: ImmediateScheduler.Instance);
//act
sut.Execute(null);
//allow any work scheduled with the schedulers to advance
schedulers.AdvanceBy(200);
//allow notifications to advance
scheduler.AdvanceBy(200);
//assert
observer.Messages.AssertEqual(OnNext(10, value1),
OnNext(20, value2),
OnNext(30, value3),
OnCompleted(40, new object()));
}
public void Execute_WhenError_ShouldCallNotifyNotExecuting(
Mock<ICanExecuteStrategy<object>> canExecute,
Exception error,
object obj,
TestSchedulers schedulers)
{
//arrange
var value = Observable.Throw<object>(error, ImmediateScheduler.Instance);
var sut = new ObservableMvvmCommand<object, object>(_ => value, schedulers, schedulers, "name", canExecute.Object);
//act
sut.Execute(obj);
schedulers.AdvanceBy(200);
//assert
canExecute.Verify(c => c.NotifyNotExecuting(obj), Times.Once());
}
public void Execute_ShouldCallNotifyExecuting(
[Frozen]Mock<ICanExecuteStrategy<object>> canExecute,
ObservableMvvmCommand<object, object> sut,
[Frozen]object obj,
TestSchedulers schedulers)
{
//arrange
//act
sut.Execute(obj);
schedulers.AdvanceBy(200);
//assert
canExecute.Verify(c => c.NotifyExecuting(obj), Times.Once());
}
public void Execute_ShouldCallOnError(
Exception expected,
TestSchedulers schedulers)
{
//arrange
Exception actual = null;
var value = Observable.Throw<object>(expected, ImmediateScheduler.Instance);
var sut = new ObservableMvvmCommand<object, object>(
o => value,
schedulers,
schedulers,
"name",
new AlwaysTrueCanExecuteStrategy<object>(),
doObserver: () => Observer.Create<object>(_ => { }, e => actual = e),
doScheduler: ImmediateScheduler.Instance);
//act
sut.Execute(null);
schedulers.AdvanceBy(200);
//assert
actual.Should().Be(expected);
}
public void Execute_ShouldCallCallback(
object expected,
TestSchedulers schedulers)
{
//arrange
object actual = null;
var value = Observable.Return(expected, ImmediateScheduler.Instance);
var sut = new ObservableMvvmCommand<object, object>(
o => value,
schedulers,
schedulers,
"name",
new AlwaysTrueCanExecuteStrategy<object>(),
doObserver: () => Observer.Create<object>(o => actual = o),
doScheduler: ImmediateScheduler.Instance);
//act
sut.Execute(null);
schedulers.AdvanceBy(200);
//assert
actual.Should().Be(expected);
}
public void Execute_ShouldExecuteObservable(
TestSchedulers schedulers)
{
//arrange
bool observableCalled = false;
var value = Observable.Return(Unit.Default, ImmediateScheduler.Instance)
.Do(unit => observableCalled = true);
var sut = new ObservableMvvmCommand<object, System.Reactive.Unit>(o => value, schedulers, schedulers, "name", new AlwaysTrueCanExecuteStrategy<object>());
//act
sut.Execute(null);
schedulers.AdvanceBy(200);
//assert
observableCalled.Should().BeTrue();
}