MockTreeLeaf treeLeaf = new MockTreeLeaf();
treeLeaf.setState(CoreDataCreatorForTests.createSpecificTreeLeafState());
universe.addFallenLeaf(treeLeaf);
MockTree tree = new MockTree();
tree.setState(CoreDataCreatorForTests.createSpecificTreeState());
universe.addTree(tree);
universe3D.initFromUniverse(universe);
assertTrue(universe3D.getElements3D().contains(universe.getEnvironment().getEnvironment3D().getGroup()));
assertTrue(universe3D.getElements3D().contains(universe.getPhysics().getPhysics3D().getGroup()));