### Question:
BatchUtil { public static boolean shouldRetain(int i, int maxRetention, int length) { int retentionCutoff = length - maxRetention; boolean retain = (i >= retentionCutoff) ? true : false; return retain; }  static boolean shouldRetain(int i, int maxRetention, int length); static int getBatchCount(int length, int batchSize); static List<Range<E>> getRanges(Collection<E> collection,
      int batchSize);  }### Answer:
@Test public void testShouldRetain() { assertTrue(BatchUtil.shouldRetain(0, 1, 1)); assertTrue(BatchUtil.shouldRetain(5, 5, 10)); assertFalse(BatchUtil.shouldRetain(0, 1, 2)); assertFalse(BatchUtil.shouldRetain(4, 5, 10)); assertFalse(BatchUtil.shouldRetain(4, 100000, 155690)); }