public void ExpressionlessSourceManipulation()
{
var numbers = new ObservableDictionary <string, decimal>();
using (var aggregate = numbers.ActiveAverage())
{
Assert.IsNotNull(aggregate.OperationFault);
Assert.AreEqual(0, aggregate.Value);
numbers.Add("1", 1m);
Assert.IsNull(aggregate.OperationFault);
Assert.AreEqual(1m, aggregate.Value);
numbers.AddRange(System.Linq.Enumerable.Range(2, 3).ToDictionary(i => i.ToString(), i => Convert.ToDecimal(i)));
Assert.AreEqual(2.5m, aggregate.Value);
numbers.RemoveRange(new string[] { "1", "2" });
Assert.AreEqual(3.5m, aggregate.Value);
numbers.Remove("3");
Assert.AreEqual(4m, aggregate.Value);
numbers.Remove("4");
Assert.IsNotNull(aggregate.OperationFault);
Assert.AreEqual(0m, aggregate.Value);
numbers.Reset(System.Linq.Enumerable.Range(2, 3).ToDictionary(i => i.ToString(), i => Convert.ToDecimal(i)));
Assert.IsNull(aggregate.OperationFault);
Assert.AreEqual(3m, aggregate.Value);
}
}