### Question:
NodeRef implements Bounded, Comparable<NodeRef> { public static List<String> split(final @NonNull String path) { if (NodeRef.ROOT.equals(path)) { return new ArrayList<>(); } List<String> split = Splitter.on(PATH_SEPARATOR).splitToList(path); return split; } NodeRef(@NonNull Node node, String parentPath, @NonNull ObjectId metadataId); NodeRef update(final ObjectId newId, final @Nullable Envelope newBounds); static NodeRef createRoot(Node node); static NodeRef create(String parentPath, Node node); static NodeRef create(String parentPath, Node node, ObjectId metadataId); String getParentPath(); Node getNode(); String path(); String name(); @Override ObjectId getObjectId(); ObjectId getMetadataId(); ObjectId getDefaultMetadataId(); RevObject.TYPE getType(); @Override boolean equals(Object o); @Override int hashCode(); @Override int compareTo(NodeRef o); @Override String toString(); static @Nullable String parentPath(@Nullable String fullPath); static void checkValidPath(final String path); static @Nullable String nodeFromPath(@Nullable String fullPath); static boolean isDirectChild(@NonNull String parentPath, @NonNull String nodePath); static boolean isChild(@NonNull String parentPath, @NonNull String nodePath); static List<String> allPathsTo(final @NonNull String path); static List<String> split(final @NonNull String path); static String appendChild(String parentTreePath, @NonNull String childName); @Override boolean intersects(Envelope env); @Override void expand(Envelope env); static int depth(String path); static String removeParent(final String parentPath, final String childPath); @Override Optional<Envelope> bounds(); static NodeRef tree(@NonNull String treePath, @NonNull ObjectId id,
            @NonNull ObjectId metadataId); static final String ROOT; static final char PATH_SEPARATOR; }### Answer:
@Test public void testSplit() { assertEquals(ImmutableList.of("Points", "sub", "points.1"), NodeRef.split("Points/sub/points.1")); assertEquals(Collections.emptyList(), NodeRef.split("")); assertThrows(NullPointerException.class, () -> NodeRef.split(null)); }