public void Count_ObservableSourceItemAdded_NoUpdateWhenDetached()
{
var update = false;
var coll = new NotifyCollection<int>() { 1, 2, 3 };
var test = Observable.Expression(() => coll.WithUpdates().Count());
test.ValueChanged += (o, e) => update = true;
Assert.AreEqual(3, test.Value);
Assert.IsFalse(update);
test.Detach();
coll.Add(4);
Assert.IsFalse(update);
test.Attach();
Assert.IsTrue(update);
Assert.AreEqual(4, test.Value);
update = true;
coll.Add(5);
Assert.IsTrue(update);
}
public void NullableIntAverage_ObservableSource_NoUpdatesWhenDetached()
{
var update = false;
var coll = new NotifyCollection <int?>()
{
1, 2, 3, null
};
var testColl = coll.WithUpdates();
var test = Observable.Expression(() => testColl.Average());
test.ValueChanged += (o, e) => update = true;
Assert.AreEqual(2, test.Value);
Assert.AreEqual(2, testColl.Average());
Assert.IsFalse(update);
test.Detach();
coll.Add(4);
Assert.IsFalse(update);
test.Attach();
Assert.IsTrue(update);
Assert.AreEqual(2.5, test.Value);
update = false;
coll.Add(5);
Assert.IsTrue(update);
}
public void Count_ObservableSourceItemAdded_NoUpdateWhenDetached()
{
var update = false;
var coll = new NotifyCollection <int>()
{
1, 2, 3
};
var test = Observable.Expression(() => coll.WithUpdates().Count());
test.ValueChanged += (o, e) => update = true;
Assert.AreEqual(3, test.Value);
Assert.IsFalse(update);
test.Detach();
coll.Add(4);
Assert.IsFalse(update);
test.Attach();
Assert.IsTrue(update);
Assert.AreEqual(4, test.Value);
update = true;
coll.Add(5);
Assert.IsTrue(update);
}
public void CountPredicate_ObservableSourceReset_Update()
{
var update = false;
var coll = new NotifyCollection <int>()
{
1, 2, 3, -1, -3
};
var test = Observable.Expression(() => coll.WithUpdates().Count(i => i > 0));
test.ValueChanged += (o, e) => update = true;
coll.Clear();
Assert.IsTrue(update);
}
public void GroupBy_ObservableSource_NoUpdatesWhenDetached()
{
var update = false;
ICollection <Dummy <string> > coll = new NotifyCollection <Dummy <string> >();
var test = coll.WithUpdates().GroupBy(d => d.Item);
test.CollectionChanged += (o, e) => update = true;
Assert.IsTrue(!test.Any());
Assert.IsFalse(update);
test.Detach();
update = false;
var testDummy = new ObservableDummy <string>()
{
Item = "42"
};
coll.Add(testDummy);
Assert.IsFalse(update);
testDummy.Item = "23";
Assert.IsFalse(update);
test.Attach();
Assert.IsTrue(update);
Assert.AreEqual("23", test.FirstOrDefault().Key);
update = false;
testDummy.Item = "42";
Assert.IsTrue(update);
update = false;
coll.Remove(testDummy);
Assert.IsTrue(update);
}
public void LambdaIntAverage_ObservableSourceItemAdded_NoUpdatesWhenDetached()
{
var update = false;
var coll = new NotifyCollection <Dummy <int> >()
{
new Dummy <int>(1), new Dummy <int>(2), new Dummy <int>(3)
};
var testColl = coll.WithUpdates();
var test = Observable.Expression(() => testColl.Average(d => d.Item));
test.ValueChanged += (o, e) => update = true;
Assert.AreEqual(2, test.Value);
Assert.AreEqual(2, testColl.Average(d => d.Item));
Assert.IsFalse(update);
test.Detach();
var testDummy = new ObservableDummy <int>(5);
coll.Add(testDummy);
Assert.IsFalse(update);
testDummy.Item = 4;
Assert.IsFalse(update);
test.Attach();
Assert.IsTrue(update);
Assert.AreEqual(2.5, test.Value);
update = false;
testDummy.Item = 5;
Assert.IsTrue(update);
update = false;
coll.Remove(testDummy);
}
public void Distinct_ObservableSourceReset_Update()
{
var update = false;
var coll = new NotifyCollection <int>()
{
1, 2, 2, 3
};
var test = coll.WithUpdates().Distinct();
test.CollectionChanged += (o, e) =>
{
update = true;
Assert.AreEqual(NotifyCollectionChangedAction.Reset, e.Action);
};
coll.Clear();
Assert.IsTrue(update);
Assert.AreEqual(0, test.Count());
}
public void GroupBy_ObservableSource_NoUpdatesWhenDetached()
{
var update = false;
ICollection<Dummy<string>> coll = new NotifyCollection<Dummy<string>>();
var test = coll.WithUpdates().GroupBy(d => d.Item);
test.CollectionChanged += (o, e) => update = true;
Assert.IsTrue(!test.Any());
Assert.IsFalse(update);
test.Detach();
update = false;
var testDummy = new ObservableDummy<string>() { Item = "42" };
coll.Add(testDummy);
Assert.IsFalse(update);
testDummy.Item = "23";
Assert.IsFalse(update);
test.Attach();
Assert.IsTrue(update);
Assert.AreEqual("23", test.FirstOrDefault().Key);
update = false;
testDummy.Item = "42";
Assert.IsTrue(update);
update = false;
coll.Remove(testDummy);
Assert.IsTrue(update);
}
public void LambdaIntAverage_ObservableSourceItemAdded_NoUpdatesWhenDetached()
{
var update = false;
var coll = new NotifyCollection<Dummy<int>>() { new Dummy<int>(1), new Dummy<int>(2), new Dummy<int>(3) };
var testColl = coll.WithUpdates();
var test = Observable.Expression(() => testColl.Average(d => d.Item));
test.ValueChanged += (o, e) => update = true;
Assert.AreEqual(2, test.Value);
Assert.AreEqual(2, testColl.Average(d => d.Item));
Assert.IsFalse(update);
test.Detach();
var testDummy = new ObservableDummy<int>(5);
coll.Add(testDummy);
Assert.IsFalse(update);
testDummy.Item = 4;
Assert.IsFalse(update);
test.Attach();
Assert.IsTrue(update);
Assert.AreEqual(2.5, test.Value);
update = false;
testDummy.Item = 5;
Assert.IsTrue(update);
update = false;
coll.Remove(testDummy);
}
public void Contains_ObservableSourceReset_Update()
{
var update = false;
var coll = new NotifyCollection<int>() { 1, 2, 3 };
var test = Observable.Expression(() => coll.WithUpdates().Contains(2));
test.ValueChanged += (o, e) => update = true;
coll.Clear();
Assert.IsTrue(update);
}
public void Distinct_ObservableSourceReset_Update()
{
var update = false;
var coll = new NotifyCollection<int>() { 1, 2, 2, 3 };
var test = coll.WithUpdates().Distinct();
test.CollectionChanged += (o, e) =>
{
update = true;
Assert.AreEqual(NotifyCollectionChangedAction.Reset, e.Action);
};
coll.Clear();
Assert.IsTrue(update);
Assert.AreEqual(0, test.Count());
}
public void NullableIntAverage_ObservableSource_NoUpdatesWhenDetached()
{
var update = false;
var coll = new NotifyCollection<int?>() { 1, 2, 3, null };
var testColl = coll.WithUpdates();
var test = Observable.Expression(() => testColl.Average());
test.ValueChanged += (o, e) => update = true;
Assert.AreEqual(2, test.Value);
Assert.AreEqual(2, testColl.Average());
Assert.IsFalse(update);
test.Detach();
coll.Add(4);
Assert.IsFalse(update);
test.Attach();
Assert.IsTrue(update);
Assert.AreEqual(2.5, test.Value);
update = false;
coll.Add(5);
Assert.IsTrue(update);
}
