public IEnumerator showGridUITest()
        {
            SceneManager.LoadScene("Scene", LoadSceneMode.Single);
            yield return(new WaitForSeconds(1.0f));

            GameObject[] go = SceneManager.GetActiveScene().GetRootGameObjects();

            HexMapEditor editor = go[3].transform.Find("Hex Map Editor").GetComponent <HexMapEditor>();

            editor.ShowUI(true);
            CollectionAssert.DoesNotContain(editor.terrainMaterial.shaderKeywords, "GRID_ON");

            foreach (GameObject g in go)
            {
                GameObject.Destroy(g);
            }
            SceneManager.UnloadScene("Scene");
        }