XI Workshop de Testes e TolerÃ¢ncia a Falhas (WTF) - SBRC 2010

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128 Anais The third, and last state machine developed, is the Sneak Paths Behavior, shown in Fig. 7. This model consists in the expected events occurring in inopportune moments. In this model, when the OBDH software is in the acceptance state, waiting for the acceptance event from the process application, if it receives the event “CompExec_OK[----]”, the service software shall send a failure report regarding this failure, and return to its initial state. Analogously, when the service software is in execution completion state, if it receives the event “Acc_OK[----]”, it shall send the failure report to inform the failure. Note also that, as well as the model of Fig.6, the “Ack” field has the configuration “[----]”, meaning that regardless its bits values, if the those events occur, the report must be sent and the service software must return to its initial state. The error codes are mission-specific. Telecommand Verification Service – Sneak Paths Without TC TC_Arrival / - Acc_OK[----] / RepFalCompExec(Code=X4) Checking TC TC_OK / Send_TC_to_Process Waiting for Acceptance CompExec_OK[----] / RepFalAcc(Code=X3) Acc_OK [---0] / - Waiting for TC Execution Conclusion Figure 7. Telecommand Verification Sneak Paths Behavior model.
XI Workshop de Testes e Tolerância a Falhas 129 In general, the size of the finite state machine models is considered small. The biggest model has only four states and eleven transitions. 5.2. Generation of Test Cases Sixteen test cases were generated from the three developed models. The Tables 3, 4 and 5 show, respectively, some test cases from Normal Behavior Model, Specified Exceptions Behavior Model and Sneak Paths Behavior Model. A test case is a sequence of inputs and outputs. Table 3. Test cases for Normal Behavior Model. CASE NUMBER INPUT OUTPUT TC_Arrival - 2 TC_OK Send_TC_to_Process Acc_OK[---1] RepSucAcc CompExec_OK[---0] - TC_Arrival - 4 TC_OK Send_TC_to_Process Acc_OK[---1] CompExec_OK[---1] RepSucAcc RepSucCompExec Table 4. Test cases for Specified Exceptions Behavior Model. CASE NUMBER INPUT OUTPUT 7 TC_Arrival - APID_NOK RepFalAcc(Code=0) 8 TC_Arrival - Length_NOK RepFalAcc(Code=1) 9 TC_Arrival - Checksum_NOK RepFalAcc(Code=2) 10 TC_Arrival - Type_NOK RepFalAcc(Code=3)
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XXVIII Simpósio Brasileiro de Rede
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XI Workshop de Testes e Tolerância
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4 Anais tais problemas. Portanto, h
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6 Anais consenso para o modelo ass
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8 Anais em andamento (por exemplo,
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10 Anais cada partição síncrona,
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12 Anais A tarefa T 4 é executada
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14 Anais • Assumimos que o proces
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16 Anais Veríssimo, P. and Casimir
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18 Anais Entretanto, em caso de fal
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20 Anais à aplicação: SafeSendT
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22 Anais Na fase de inicialização
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24 Anais acesso a C e nem a C d . E
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26 Anais Prova. 1. Se t + 1 /∈ C
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28 Anais algoritmo de término. Vá
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32 Anais [Chandra and Toueg 1996].
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34 Anais Every JXTA-FD instance exe
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36 Anais 3.4. GossipTask A rotina G
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38 Anais mecanismo foi adotado para
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40 Anais Tempo de Detecção e Recu
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44 Anais Fischer, M. J., Lynch, N.
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46 Anais 1. Introdução Sistemas d
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50 Anais Figura 1. Interface do QoS
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56 Anais O DSCP utilizado para o Se
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XI Workshop de Testes e TolerÃ¢ncia a Falhas (WTF) - SBRC 2010

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