public void TestClone()
{
Placemark placemark = null;
Assert.That(() => placemark.Clone(),
Throws.TypeOf <ArgumentNullException>());
placemark = new Placemark();
placemark.Id = "ID";
placemark.Geometry = new Point();
var clone = placemark.Clone();
Assert.That(clone, Is.Not.SameAs(placemark));
Assert.That(clone.Id, Is.EqualTo(placemark.Id)); // Test attribute
Assert.That(clone.Geometry, Is.Not.Null); // Test element
// Make sure as we change one the other doesn't
((Point)clone.Geometry).Extrude = true;
Assert.That(((Point)clone.Geometry).Extrude,
Is.Not.EqualTo(((Point)placemark.Geometry).Extrude));
Folder folder = new Folder();
folder.AddFeature(placemark);
folder.AddFeature(new Document());
var copy = folder.Clone();
Assert.That(copy.Features.Count(), Is.EqualTo(folder.Features.Count()));
placemark.Id = "changed";
Assert.That(folder.FindFeature(placemark.Id), Is.Not.Null);
Assert.That(copy.FindFeature(placemark.Id), Is.Null);
}