@Test(expected = AssertionError.class)
    public void testNoSortByParam() {
        Material sameMat1 = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");
        Material sameMat2 = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");
        
        sameMat1.setName("MatRed");
        sameMat1.setColor("Color", ColorRGBA.Red);
        
        sameMat2.setName("MatBlue");
        sameMat2.setColor("Color", ColorRGBA.Blue);
        
        testSort(sameMat1, sameMat2);
    }
Given a correctly sorted list of materials, check if the 
opaque comparator can sort a reversed list of them.

Each material will be cloned so that none of them will be equal to each other
in reference, forcing the comparator to compare the material sort ID.

E.g. for a list of materials A, B, C, the following list will be generated:
<pre>C, B, A, C, B, A, C, B, A</pre>, it should result in
<pre>A, A, A, B, B, B, C, C, C</pre>.

@param materials The pre-sorted list of materials to check sorting for.
jme3-core/src/test/java/com/jme3/renderer/OpaqueComparatorTest.java