public IEnumerator StopHighlight()
        {
            foreach (Type highlighterImplementation in ReflectionUtils.GetConcreteImplementationsOf <IHighlighter>())
            {
                // Given a GameObject with at least one Renderer
                GameObject   cube        = GameObject.CreatePrimitive(PrimitiveType.Cube);
                IHighlighter highlighter = cube.AddComponent(highlighterImplementation) as IHighlighter;;

                Assert.That(highlighter != null);
                Assert.IsFalse(highlighter.IsHighlighting);

                // When StartHighlighting
                highlighter.StartHighlighting(CreateHighlightMaterial());

                yield return(null);

                // Then the object is highlighted and then stopped.
                Assert.IsTrue(highlighter.IsHighlighting);
                highlighter.StopHighlighting();

                yield return(null);

                Assert.IsFalse(highlighter.IsHighlighting);
            }
        }