@Test
 public void exceptionsInMidst() {
   ValidTxnList txns = new ValidCompactorTxnList(new long[] {8}, 8, 15);
   ValidTxnList.RangeResponse rsp = txns.isTxnRangeValid(7, 9);
   Assert.assertEquals(ValidTxnList.RangeResponse.NONE, rsp);
 }
 @Test
 public void minTxnHighNoExceptions() {
   ValidTxnList txns = new ValidCompactorTxnList(new long[0], -1, 5);
   ValidTxnList.RangeResponse rsp = txns.isTxnRangeValid(7, 9);
   Assert.assertEquals(ValidTxnList.RangeResponse.NONE, rsp);
 }
 @Test
 public void maxTxnLowNoExceptions() {
   ValidTxnList txns = new ValidCompactorTxnList(new long[0], -1, 15);
   ValidTxnList.RangeResponse rsp = txns.isTxnRangeValid(7, 9);
   Assert.assertEquals(ValidTxnList.RangeResponse.ALL, rsp);
 }
 @Test
 public void maxTxnLow() {
   ValidTxnList txns = new ValidCompactorTxnList(new long[] {13, 14}, 13, 15);
   ValidTxnList.RangeResponse rsp = txns.isTxnRangeValid(7, 9);
   Assert.assertEquals(ValidTxnList.RangeResponse.ALL, rsp);
 }