public void ReplaceAllShouldClearAndAddRange()
{
// arrange
var oldItems = new List<object>() { new object(), new object(), new object() };
var newItems = new List<object>() { new object(), new object(), new object() };
var target = new Collection<object>();
target.AddRange( oldItems );
// act
target.ReplaceAll( newItems );
// assert
Assert.Equal( newItems.Count, target.Count );
Assert.True( target.SequenceEqual( newItems ) );
}