public void SumAggregatorCalculate()
{
var numbers = new object[] {1, 2, 4};
var aggregator = numbers.AsBindable<object, int>().Sum();
var eventCatcher = new PropertyEventMonitor(aggregator);
Assert.AreEqual(1 + 2 + 4, aggregator.Current);
Assert.AreEqual(1, eventCatcher.Count);
}
public void CustomAggregatorAccumulateTypeCalculate()
{
var names = new[] {"Paul", "Jackie", "Tom"};
var aggregator = names.AsBindable().Aggregate(0, (i, name) => i + name.Length);
var eventCatcher = new PropertyEventMonitor(aggregator);
Assert.AreEqual(4 + 6 + 3, aggregator.Current);
Assert.AreEqual(1, eventCatcher.Count);
}
public void SumAggregatorCollectionChangeCausesRefresh()
{
var numbers = new ObservableCollection<object>();
numbers.AddRange(1, 2, 4);
var aggregator = numbers.AsBindable<object, int>().Sum();
var eventCatcher = new PropertyEventMonitor(aggregator);
Assert.AreEqual(1 + 2 + 4, aggregator.Current);
Assert.AreEqual(1, eventCatcher.Count);
// Test an Add
numbers.Add(8);
Assert.AreEqual(1 + 2 + 4 + 8, aggregator.Current);
Assert.AreEqual(2, eventCatcher.Count);
// Test a Remove
numbers.RemoveAt(0);
Assert.AreEqual(2 + 4 + 8, aggregator.Current);
Assert.AreEqual(3, eventCatcher.Count);
// Test a Replace
numbers[0] = 4;
Assert.AreEqual(4 + 4 + 8, aggregator.Current);
Assert.AreEqual(4, eventCatcher.Count);
// Test an AddRange
numbers.AddRange(4, 5);
Assert.AreEqual(4 + 4 + 8 + 4 + 5, aggregator.Current);
Assert.AreEqual(5, eventCatcher.Count);
// Test a replace with the same value - no events should be raised
numbers[0] = numbers[0];
Assert.AreEqual(4 + 4 + 8 + 4 + 5, aggregator.Current);
Assert.AreEqual(5, eventCatcher.Count);
// Test an add with 0
numbers.Add(0);
Assert.AreEqual(4 + 4 + 8 + 4 + 5, aggregator.Current);
Assert.AreEqual(5, eventCatcher.Count);
}
