public void Test_ClearScene_Negative() { // Arrange var scene = new SceneViewModel { Model3D = new Model3DGroup(), CoordinatesBoundingBox = new Point3DCollection(), ManipulatorValue = 10.0 }; // Act scene.ClearScene(); // Assert Assert.IsNull(scene.Model3D); Assert.IsNull(scene.CoordinatesBoundingBox); Assert.AreNotEqual(10, scene.ManipulatorValue); }