code: public StaticBuffer get(final AbstractDynamoDbStore store, final StaticBuffer key, final StaticBuffer column) {
          // This method assumes the caller has called contains(..) and received a positive response
          return expectedValues.get(store).get(key).get(column);
      }
docs: Gets the expected value for a particular key and column, if any
  @param store the store to put the expected key column value
  @param key the key to get the expected value for
  @param column the column to get the expected value for
  @return the expected value of the given key-column pair, if any.