@Before
  public void setup() throws IOException {
    cache = new MockedBucketCache(ioEngineName, capacitySize, constructedBlockSize,
      constructedBlockSizes, writeThreads, writerQLen, null);
  }
Basic test of BucketCache.Puts and gets.
<p>
Tests will ensure that blocks' data correctness under several threads concurrency
hbase-server/src/test/java/org/apache/hadoop/hbase/io/hfile/bucket/TestBucketCache.java