public void SourceManipulation()
{
var things = new SynchronizedRangeObservableCollection <object>(new object[]
{
0,
false,
"John",
DateTime.Now,
"Emily",
Guid.NewGuid(),
"Charles",
TimeSpan.Zero,
new object()
});
using var strings = things.ActiveOfType <string>();
void checkStrings(params string[] against) => Assert.IsTrue(strings.OrderBy(s => s).SequenceEqual(against));
checkStrings("Charles", "Emily", "John");
things.Add("Bridget");
things.Remove("John");
things.Move(things.Count - 1, 0);
checkStrings("Bridget", "Charles", "Emily");
things.Reset(new object[]
{
new object(),
TimeSpan.Zero,
"George",
Guid.NewGuid(),
"Craig",
DateTime.Now,
"Cliff",
false,
0
});
checkStrings("Cliff", "Craig", "George");
}