### Question:
BoxPath implements Path { @Override public BoxPath getParent() { if (getNameCount() <= (isAbsolute() ? 0 : 1)) { return null; } BoxPath relativeParent = subpath(0, getNameCount() - 2); return isAbsolute() ? getRoot().resolve(relativeParent) : relativeParent; } BoxPath(BoxFileSystem fileSystem, String path); FolderLike toFilderLike(); @Override FileSystem getFileSystem(); @Override boolean isAbsolute(); @Override BoxPath getRoot(); @Override Path getFileName(); @Override BoxPath getParent(); @Override int getNameCount(); @Override BoxPath getName(int index); @Override BoxPath subpath(int beginIndex, int endIndex); @Override boolean startsWith(Path other); @Override boolean startsWith(String other); @Override boolean endsWith(Path other); @Override boolean endsWith(String other); @Override BoxPath normalize(); @Override BoxPath resolve(Path other); @Override BoxPath resolve(String other); @Override BoxPath resolveSibling(Path other); @Override BoxPath resolveSibling(String other); @Override BoxPath relativize(Path other); @Override URI toUri(); @Override BoxPath toAbsolutePath(); @Override BoxPath toRealPath(LinkOption... options); @Override File toFile(); @Override WatchKey register(WatchService watcher, WatchEvent.Kind<?>[] events, WatchEvent.Modifier... modifiers); @Override WatchKey register(WatchService watcher, WatchEvent.Kind<?>... events); @Override Iterator<Path> iterator(); @Override int compareTo(Path other); @Override String toString(); @Override int hashCode(); @Override boolean equals(Object obj);  }### Answer:
@Test public void relativeSingleElementPathHasNoParent() { assertNull(path("element").getParent()); }
@Test public void rootHasNoParent() { assertNull(path("/").getParent()); }