@Before
  public void setUp() {
    array = new byte[8];
    for (int i = 0; i < array.length; ++i) {
      array[i] = (byte) ('a' + i);
    }
  }
Create an array with sample data.
hbase-common/src/test/java/org/apache/hadoop/hbase/util/TestByteBufferUtils.java