@Override
      public Void answer(InvocationOnMock invocation) throws Throwable {
        MiniBatchOperationInProgress<Mutation> mb = invocation.getArgument(0);
        mb.addOperationsFromCP(0, new Mutation[] { addPut });
        return null;
      }
Tests that there is server-side filtering for invalid timestamp upper bound. Note that the
timestamp lower bound is automatically handled for us by the TTL field.
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestHRegion.java