Extension of Object-Oriented Software Testing Techniques to Agent ...

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EXTENSION OF OBJECT-ORIENTED SOFTWARE TESTING TECHNIQUES TO AGENTORIENTED SOFTWARE TESTINGThe testing techniques like random testing, behavioral testing and partition testingare black box testing techniques that can be utilized to test the agents individually. Stubshave to be written for implementing the test cases for those techniques.3 RANDOM TESTING FOR AGENTSThe random testing proposed in the paper for agent oriented systems is analogous to thatof the object oriented framework. One agent is considered at a time. The list of allpossible messages which the agent can receive is formulated. The normal sequence of themessages which can be sent to the agent is formed. The agent is tested by sending randommessages in that sequence and the response of the agent corresponding to the messagesequence is checked.In the flight air ticket booking example, the sequence of messages that the buyeragent expects is:(Propose – Inform | Failure) | RefuseTest cases for different message sequences are generated randomly. For example:• Test Case 1: Propose – Inform• Test Case 2: Propose – Failure• Test Case 3: RefuseThe agent can also be tested under test case which sends other kinds of messages whichare not known to the agent. The following is the pseudo code for testing Propose – Inform(Test Case 1) message sequence. Using this method the following test are generated.Test Case 1:Agent under testAgent goal testedCollaboration agents involvedTesting techniqueScenarioExpected resultObserved resultTest Case resultBuyer AgentBuy tickets with the cheapest sellerSeller agentRandom TestingTesting Buyer by sending PROPOSE and INFORMmessagesBuyer agent will reject the proposal.When selecting the best seller, the buyer did notconsider the price to be greater than zero. The buyerselected the seller even though it offered a price lessthan zero.Failed158 JOURNAL OF OBJECT TECHNOLOGY VOL. 7, NO. 8
Test Case 2:Agent under testGoal TestedCollaboration agents involvedTesting techniqueScenarioExpected resultObserved resultTest Case resultBuyer AgentBuy tickets with the cheapest sellerSeller agentRandom TestingTesting buyer agent by sending REJECT messagesfor accept proposalsBuyer agent will not consider the seller agent as theseller tickets for the required route.Buyer agent did not consider the seller agent as theseller tickets for the required route.PassedTest Case 3:Agent under testGoal TestedCollaboration agents involvedTesting techniqueScenarioExpected resultObserved resultTest Case resultBuyer AgentBuy tickets with the cheapest sellerSeller agentRandom TestingTesting buyer agent by sending messages not knownto the buyer after receiving a ACCEPT_PROPOSALmessage.Buyer will ignore the message and continue with itsactivity.Buyer ignored the message and continued with itsactivity.Passed4 BEHAVIOR BASED TESTING FOR AGENTSAgents can have any number of behaviors like one-shot, cyclic, parallel, sequential, FSMbehaviors. Each behavior is seen as a black box. Apart from this the programmers canwrite their own behaviors. Each behavior can send or receive any number of messages.Test cases must be designed in such a way so as to test the behaviors of the agent bysending messages. In the flight air ticket booking example, the seller agent has two cyclicbehaviors.VOL. 7, NO. 8 JOURNAL OF OBJECT TECHNOLOGY 159
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