### Question:
BitmapIndexFwdNullReader implements BitmapIndexReader { @Override public int getKeyCount() { return 1; }  @Override RowCursor getCursor(boolean cachedInstance, int key, long minValue, long maxValue); @Override int getKeyCount(); @Override boolean isOpen();  }### Answer:
@Test public void testKeyCount() { Assert.assertEquals(1, reader.getKeyCount()); }