public void TestIsChildOf()
{
Placemark placemark = null;
Assert.That(() => placemark.IsChildOf <Folder>(),
Throws.TypeOf <ArgumentNullException>());
placemark = new Placemark();
Assert.False(placemark.IsChildOf <Folder>());
var folder = new Folder();
folder.AddFeature(placemark);
Assert.True(placemark.IsChildOf <Folder>());
Assert.False(placemark.IsChildOf <Kml>());
var kml = new Kml();
kml.Feature = folder;
Assert.True(placemark.IsChildOf <Kml>());
}