public void DoesSupportObservableHashSet()
{
List <string> expected;
List <int> expectedForked;
ObservableHashSet <int> source1 = new ObservableHashSet <int>();
ObservableHashSet <int> source2 = new ObservableHashSet <int>();
ObservableHashSet <int> source3 = new ObservableHashSet <int>();
List <string> projection1 = new List <string>();
List <string> projection2 = new List <string>();
List <int> projection3 = new List <int>();
Func <int, string> transformation = i => i.ToString();
Func <int, bool> filterPredicate = i => i <= 2;
ListBinding <string> binding = new ListBinding <string>()
.AddSource(source1, convert: transformation, filter: filterPredicate)
.AddSource(source2, convert: transformation, filter: filterPredicate)
.AddSource(source3, convert: transformation, filter: filterPredicate);
source1.Add(0);
source2.Add(1);
source3.Add(2);
source3.Add(3);
source2.Add(4);
binding.AddTarget(projection1);
source1.Add(5);
source2.Add(6);
binding.AddTarget(projection2);
source1.Add(7);
source3.Add(8);
expected = source1.Concat(source2).Concat(source3).Where(filterPredicate).Select(transformation).ToList();
expected.Sort();
Assert.Equal(expected, projection1);
Assert.Equal(expected, projection2);
var bindingForked = binding.Select <int>(item => int.Parse(item));
source2.Remove(4);
source1.Remove(5);
source2.Remove(6);
expected = source1.Concat(source2).Concat(source3).Where(filterPredicate).Select(transformation).ToList();
expected.Sort();
Assert.Equal(expected, projection1);
Assert.Equal(expected, projection2);
source1.Add(4);
source3.Add(5);
source1.Add(6);
expected = source1.Concat(source2).Concat(source3).Where(filterPredicate).Select(transformation).ToList();
expected.Sort();
Assert.Equal(expected, projection1);
Assert.Equal(expected, projection2);
source1.Clear();
expected = source1.Concat(source2).Concat(source3).Where(filterPredicate).Select(transformation).ToList();
expected.Sort();
Assert.Equal(expected, projection1);
Assert.Equal(expected, projection2);
source3.Clear();
source2.Clear();
expected = source1.Concat(source2).Concat(source3).Where(filterPredicate).Select(transformation).ToList();
expected.Sort();
Assert.Equal(expected, projection1);
Assert.Equal(expected, projection2);
expectedForked = source1.Concat(source2).Concat(source3).Where(filterPredicate).ToList();
expectedForked.Sort();
Assert.Equal(expectedForked, projection3);
}