@SuppressWarnings("GuardedByChecker")
  private static void addBytesToStore(JimfsOutputStream out, int... bytes) throws IOException {
    RegularFile file = out.file;
    long pos = file.sizeWithoutLocking();
    for (int b : bytes) {
      file.write(pos++, (byte) b);
    }
  }
Tests for {@link JimfsOutputStream}.

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