### Question:
BitmapIndexFwdNullReader implements BitmapIndexReader { @Override public boolean isOpen() { return true; }  @Override RowCursor getCursor(boolean cachedInstance, int key, long minValue, long maxValue); @Override int getKeyCount(); @Override boolean isOpen();  }### Answer:
@Test public void testAlwaysOpen() { Assert.assertTrue(reader.isOpen()); }