private static JimfsAsynchronousFileChannel channel(
      RegularFile file, ExecutorService executor, OpenOption... options) throws IOException {
    JimfsFileChannel channel =
        new JimfsFileChannel(
            file,
            Options.getOptionsForChannel(ImmutableSet.copyOf(options)),
            new FileSystemState(new FakeFileTimeSource(), Runnables.doNothing()));
    return new JimfsAsynchronousFileChannel(channel, executor);
  }
Tests for {@link JimfsAsynchronousFileChannel}.

@author Colin Decker
jimfs/src/test/java/com/google/common/jimfs/JimfsAsynchronousFileChannelTest.java