public void ChildOfType()
        {
            string  json     = ReflectionUtilities.GetResourceAsString("UnitTests.Core.ApsimFile.JsonUtilitiesTestsEnsureChildrenWorks.json");
            JObject rootNode = JObject.Parse(json);

            var clocks = JsonUtilities.ChildrenOfType(rootNode, "Clock");

            Assert.AreEqual(clocks.Count, 3);

            var folders = JsonUtilities.ChildrenOfType(rootNode, "Folder");

            Assert.AreEqual(folders.Count, 1);

            var empty = JsonUtilities.ChildrenOfType(rootNode, "XYZ");

            Assert.AreEqual(empty.Count, 0);
        }