### Question:
ReadOnlyIndexReference extends IndexReference { @Override public boolean checkAndClearStale() { return false; } ReadOnlyIndexReference( IndexIdentifier identifier, IndexSearcher searcher ); @Override IndexWriter getWriter(); @Override synchronized void dispose(); @Override boolean checkAndClearStale(); @Override void setStale();  }### Answer:
@Test void checkAndClearStaleAlwaysFalse() { assertFalse( indexReference.checkAndClearStale() ); }