### Question:
ClearedLedgersSet { public boolean okToClear() { return gaps().size() == 0; }  TreeSet<Long> cleared(); int size(); void clear(long ledger_index); void clearIfNoGaps(); TreeSet<Long> gaps(); boolean okToClear(); boolean contains(long ledger_index); static boolean DEBUG; }### Answer:
@Test public void testOkToClear() throws Exception { assertFalse(set.okToClear()); }