I wrote a little monkeypatch to the Rails MySQLAdapter and want to package it up to use it in my other projects. I am trying to write some tests for it but I am still new to testing and I am not sure how to test this. Can someone help get me started?

Here is the code I want to test:

unless RAILS_ENV == 'production'
      module ActiveRecord
        module ConnectionAdapters
          class MysqlAdapter < AbstractAdapter
            def select_with_explain(sql, name = nil)
              explanation = execute_with_disable_logging('EXPLAIN ' + sql)
              e = explanation.all_hashes.first
              exp = e.collect{|k,v| " | #{k}: #{v} "}.join
              log(exp, 'Explain')
              select_without_explain(sql, name)
            end

            def execute_with_disable_logging(sql, name = nil) #:nodoc:
              #Run a query without logging
              @connection.query(sql)
            rescue ActiveRecord::StatementInvalid => exception
              if exception.message.split(":").first =~ /Packets out of order/
                raise ActiveRecord::StatementInvalid, "'Packets out of order' error was received from the database. Please update your mysql bindings (gem install mysql) and read http://dev.mysql.com/doc/mysql/en/password-hashing.html for more information.  If you're on Windows, use the Instant Rails installer to get the updated mysql bindings."
              else
                raise
              end
            end
            alias_method_chain :select, :explain
          end
        end
      end
    end

Thanks.