testCollection.add( new TestB() );
assertTrue(
"Adding a collection of UniverseElements to a UniverseElementComposite, where the container UniverseElementComposite already contains some, but not all, of the potential child UniverseElements in the collection, should return true.",
testElement2.addAll( testCollection ) );
assertTrue(
"Having added a collection of UniverseElements to a UniverseElementComposite, where the container UniverseElementComposite already contained some, but not all, of the potential child UniverseElements in the collection, the container UniverseElementComposite should report containing all the elements in the added collection.",
testElement2.contains( testCollection.get( 0 ) )
&& testElement2.contains( testCollection.get( 1 ) )