### Question:
GlusterFileSystemProvider extends FileSystemProvider { FileChannel newFileChannelHelper(Path path, Set<? extends OpenOption> options, FileAttribute<?>[] attrs) throws IOException { GlusterFileChannel channel = new GlusterFileChannel(); channel.init((GlusterFileSystem) getFileSystem(path.toUri()), path, options, attrs); return channel; }  @Override String getScheme(); @Override FileSystem newFileSystem(URI uri, Map<String, ?> stringMap); @Override FileSystem getFileSystem(URI uri); @Override Path getPath(URI uri); @Override SeekableByteChannel newByteChannel(Path path, Set<? extends OpenOption> openOptions, FileAttribute<?>... fileAttributes); @Override FileChannel newFileChannel(Path path, Set<? extends OpenOption> options, FileAttribute<?>... attrs); @Override DirectoryStream<Path> newDirectoryStream(Path path, DirectoryStream.Filter<? super Path> filter); @Override void createDirectory(Path path, FileAttribute<?>... fileAttributes); @Override void delete(Path path); @Override void copy(Path path, Path path2, CopyOption... copyOptions); @Override void move(Path path, Path path2, CopyOption... copyOptions); @Override boolean isSameFile(Path path, Path path2); @Override boolean isHidden(Path path); @Override FileStore getFileStore(Path path); @Override void checkAccess(Path path, AccessMode... accessModes); @Override V getFileAttributeView(Path path, Class<V> vClass, LinkOption... linkOptions); @Override A readAttributes(Path path, Class<A> type, LinkOption... linkOptions); @Override Map<String, Object> readAttributes(Path path, String s, LinkOption... linkOptions); @Override void setAttribute(Path path, String s, Object o, LinkOption... linkOptions); @Override Path readSymbolicLink(Path link); @Override void createSymbolicLink(Path link, Path target, FileAttribute<?>... attrs); static final String GLUSTER; static final int GLUSTERD_PORT; static final String TCP; }### Answer:
@Test public void testNewFileChannelHelper() throws Exception { Set<? extends OpenOption> options = new HashSet<OpenOption>(); FileAttribute<?> attrs[] = new FileAttribute[0]; URI uri = new URI("foo: doReturn(uri).when(mockPath).toUri(); doReturn(mockFileSystem).when(provider).getFileSystem(uri); whenNew(GlusterFileChannel.class).withNoArguments().thenReturn(mockChannel); doNothing().when(mockChannel).init(mockFileSystem, mockPath, options, attrs); FileChannel channel = provider.newFileChannel(mockPath, options, attrs); verify(mockChannel).init(mockFileSystem, mockPath, options, attrs); verify(provider).getFileSystem(uri); verify(mockPath).toUri(); verifyNew(GlusterFileChannel.class).withNoArguments(); assertEquals(mockChannel, channel); }