stack created HBASE-20078:
-----------------------------

             Summary: Add more unit tests of MultiByteBuff facility
                 Key: HBASE-20078
                 URL: https://issues.apache.org/jira/browse/HBASE-20078
             Project: HBase
          Issue Type: Task
          Components: test
            Reporter: stack
            Assignee: stack


Copied from the bottom of HBASE-13916, the JIRA that introduced MultiByteBuff:

[~anoop.hbase] This bit of code needs more test. It does not seem to be doing 
the right thing....

Doing something like the below, it does not seem to be returning the right 
answers....

  @Ignore // This test fails.
  @Test
  public void testGetInt() {
    ByteBuffer bb1 = ByteBuffer.allocate(1);
    bb1.put((byte)1);
    ByteBuffer bb2 = ByteBuffer.allocate(1);
    bb2.put((byte)0);
    ByteBuffer bb3 = ByteBuffer.allocate(1);
    bb3.put((byte)0);
    ByteBuffer bb4 = ByteBuffer.allocate(1);
    bb4.put((byte)1);
    MultiByteBuff mbb = new MultiByteBuff(bb1, bb2, bb3, bb4);
    // Value is wrong here ... needs adjusting but code is doing wrong thing.
    assertEquals(256, mbb.getIntAfterPosition(0));
  }
Ignore the expected answer in the above... just a place holder as i messed with 
the return... but if I make buffers of one byte, we do not seem to be moving 
into the next buffer properly... If I make the buffers of two bytes, similar. 
This stuff normally works because we are not spanning buffer boundaries... but 
if we do, response seems like it could be off sir. I'll have a go at this. You 
might have input meantime.



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