code: @Override
      public synchronized Object getBeliefValue(String agent_name, String belief_name,
              Connector connector) {
          return JadeAgentIntrospector.getInstance().dataToTest.get(agent_name).get(belief_name);
      }
docs: /* (non-Javadoc)
  @see es.upm.dit.gsi.beast.platform.AgentIntrospector#getBeliefValue(java.lang.String, java.lang.String, es.upm.dit.gsi.beast.platform.Connector)