public void ByLevel_ValidArgs()
        {
            var elevation = 100;
            var level     = Level.ByElevation(elevation);

            Assert.NotNull(level);

            var view = StructuralPlanView.ByLevel(level);

            Assert.NotNull(view);
        }
 public void ByLevel_BadArgs()
 {
     Assert.Throws(typeof(ArgumentNullException), () => StructuralPlanView.ByLevel(null));
 }