public void ShouldImplicitlyConvertToTValue()
{
var observable = ReadOnlyObservable.Create(new[] { new Observable <int>(5) }, x => x.Sum(y => y.Value));
int value = observable;
value.ShouldBe(observable.Value);
}
public void ShouldBeAbleToChangeUnderlyingItemsAfterConstruction()
{
var item1 = new Observable <int>(1);
var item2 = new Observable <int>(2);
var observable = ReadOnlyObservable.Create(new[] { item1 }, x => x.Sum(y => y.Value));
var propertyChangedCount = 0;
observable.PropertyChanged += delegate { propertyChangedCount++; };
observable.Configure(x =>
{
x.Items.Remove(item1);
x.Items.Add(item2);
});
propertyChangedCount.ShouldBe(1);
observable.Value.ShouldBe(2);
item1.Value = 1;
propertyChangedCount.ShouldBe(1);
observable.Value.ShouldBe(2);
item2.Value = 1;
propertyChangedCount.ShouldBe(2);
observable.Value.ShouldBe(1);
}
public void ShouldProvideValueFromSource()
{
var observable = ReadOnlyObservable.Create(new[] { new Observable <int>(1), new Observable <int>(2) },
x => x.Sum(y => y.Value));
observable.Value.ShouldBe(3);
}
public void ValidValueShouldNotResultInAnyValidationErrors()
{
var observable = ReadOnlyObservable.Create(new[] { new Observable <int>() },
x => x.Sum(y => y.Value));
observable.Error.ShouldBe(string.Empty);
observable["Value"].ShouldBe(string.Empty);
}
public void ShouldBeAbleToChangeValueGetterAfterConstruction()
{
var observable = ReadOnlyObservable.Create(new[] { new Observable <double>(1), new Observable <double>(1) },
x => x.Sum(i => i.Value));
observable.Configure(x => x.ValueGetter = y => y.Average(i => i.Value));
observable.Value.ShouldBe(1);
}
public void BrokenValidationRuleShouldResultInValidationError()
{
var errorMessage = "Value can't be zero";
var observable = ReadOnlyObservable.Create(new[] { new Observable <int>() },
x => x.Sum(y => y.Value),
x => x.Validators.Add(i => i == 0 ? errorMessage : string.Empty));
observable.Error.ShouldBe(errorMessage);
observable["Value"].ShouldBe(errorMessage);
}
public void ShouldBeAbleToAddValidationAfterConstruction()
{
var errorMessage = "Value can't be zero";
var observable = ReadOnlyObservable.Create(new[] { new Observable <int>() },
x => x.Sum(y => y.Value));
observable.Configure(x => x.Validators.Add(i => i == 0 ? errorMessage : string.Empty));
observable.Error.ShouldBe(errorMessage);
observable["Value"].ShouldBe(errorMessage);
}
public void ChangesToUnderlyingCollectionShouldAffectValue()
{
var collection = new ObservableCollection <Observable <int> >(new[] { new Observable <int>(1), new Observable <int>(2) });
var observable = ReadOnlyObservable.Create(collection, x => x.Sum(y => y.Value));
var propertyChanged = false;
observable.PropertyChanged += delegate { propertyChanged = true; };
observable.Value.ShouldBe(3);
collection.Add(new Observable <int>(3));
propertyChanged.ShouldBe(true);
observable.Value.ShouldBe(6);
}
public void ChangesToTheUnderlyingItemShouldAffectValue()
{
var sourceObservable = new Observable <int>(1);
var observable = ReadOnlyObservable.Create(new[] { sourceObservable, new Observable <int>(2) },
x => x.Sum(y => y.Value));
var propertyChanged = false;
observable.PropertyChanged += delegate { propertyChanged = true; };
observable.Value.ShouldBe(3);
sourceObservable.Value = 2;
propertyChanged.ShouldBe(true);
observable.Value.ShouldBe(4);
}
