### Question:
SequenceIdCollector { public boolean contains(long sequenceId) { return isInClosedRange(processedInterval.floorEntry(sequenceId), sequenceId); }  boolean contains(long sequenceId); boolean add(long sequenceId); int size(); void clear(); @Override String toString();  }### Answer:
@Test public void testEmpty() { assertFalse(sequenceIdCollector.contains(0)); }