### Question:
TreePathFinder extends AbstractVisitor implements Resettable { public Map<Node, List<Node>> getPaths(){ return Collections.unmodifiableMap(this.paths); }  @Override void reset(); @Override VisitorAction visit(Node node); Map<Node, List<Node>> getPaths();  }### Answer:
@Test public void find(){ Node node1a = new BranchNode(); Node node2a = new LeafNode(); Node node2b = new BranchNode(); Node node2c = new BranchNode(); node1a.addNodes(node2a, node2b, node2c); Node node3a = new BranchNode(); Node node3b = new LeafNode(); node2b.addNodes(node3a); node2c.addNodes(node3b); Node node4a = new LeafNode(); node3a.addNodes(node4a); TreeModel treeModel = new TreeModel(MiningFunction.CLASSIFICATION, new MiningSchema(), node1a); TreePathFinder finder = new TreePathFinder(); finder.applyTo(treeModel); Map<Node, List<Node>> paths = finder.getPaths(); assertEquals(3, paths.size()); assertEquals(Arrays.asList(node1a, node2a), paths.get(node2a)); assertEquals(Arrays.asList(node1a, node2b, node3a, node4a), paths.get(node4a)); assertEquals(Arrays.asList(node1a, node2c, node3b), paths.get(node3b)); }