public void Multiple()
{
var numbers = new SynchronizedRangeObservableCollection <int>(Enumerable.Range(1, 3).Select(i => i * 3));
using var expr = numbers.ActiveSingleOrDefault(i => i % 3 == 0);
Assert.IsNotNull(expr.OperationFault);
Assert.AreEqual(0, expr.Value);
}
public void ExpressionlessMultiple()
{
var numbers = new SynchronizedRangeObservableCollection <int>(new int[] { 1, 1 });
using var expr = numbers.ActiveSingleOrDefault();
Assert.IsNotNull(expr.OperationFault);
Assert.AreEqual(0, expr.Value);
}
public void EmptySource()
{
var numbers = new SynchronizedRangeObservableCollection <int>();
using var expr = numbers.ActiveSingleOrDefault(i => i % 3 == 0);
Assert.IsNull(expr.OperationFault);
Assert.AreEqual(0, expr.Value);
}
public void ExpressionlessSourceManipulation()
{
var numbers = new SynchronizedRangeObservableCollection <int>(new int[] { 1 });
using var expr = numbers.ActiveSingleOrDefault();
Assert.IsNull(expr.OperationFault);
Assert.AreEqual(1, expr.Value);
numbers.Add(2);
Assert.IsNotNull(expr.OperationFault);
Assert.AreEqual(0, expr.Value);
numbers.RemoveAt(0);
Assert.IsNull(expr.OperationFault);
Assert.AreEqual(2, expr.Value);
numbers.Clear();
Assert.IsNull(expr.OperationFault);
Assert.AreEqual(0, expr.Value);
}
public void SourceManipulation()
{
var numbers = new SynchronizedRangeObservableCollection <int>(Enumerable.Range(1, 3));
using var expr = numbers.ActiveSingleOrDefault(i => i % 3 == 0);
Assert.IsNull(expr.OperationFault);
Assert.AreEqual(3, expr.Value);
numbers.RemoveAt(2);
Assert.IsNull(expr.OperationFault);
Assert.AreEqual(0, expr.Value);
numbers.Add(3);
Assert.IsNull(expr.OperationFault);
Assert.AreEqual(3, expr.Value);
numbers.Add(5);
Assert.IsNull(expr.OperationFault);
Assert.AreEqual(3, expr.Value);
numbers.Add(6);
Assert.IsNotNull(expr.OperationFault);
Assert.AreEqual(0, expr.Value);
numbers.Clear();
Assert.IsNull(expr.OperationFault);
Assert.AreEqual(0, expr.Value);
}