2 Why We Need Model-Based Testing

Advanced Topics 243
values "Inactive", "Activating", or"Active". Initially the value of setupMode is
"Inactive". The guarded update rule for ResSetup in M = M1 × M2 can be given
as
[Action("ResSetup(m,_,s)")]
public static void ResSetup(int m, Status s)
{
mode = mode.RemoveKey(m);
if (s == Status.Cancelled)
setupMode = "Inactive";
else
setupMode = "Active";
}
public static bool ResSetupEnabled(int m, Status s)
{
return
setupMode == "Activating" &&
mode.ContainsKey(m) &&
(s != Status.Cancelled || mode[m] == Mode.CancelRequested);
}
The guarded update rule for ResWork in M1 × M2 can be given as
[Action("ResWork(m,_,s)")]
public static void ResWork(int m, Status s)
{
mode = mode.RemoveKey(m);
}
public static bool ResWorkEnabled(int m, Status s)
{
return
setupMode == "Active" &&
mode.ContainsKey(m) &&
(s != Status.Cancelled || mode[m] == Mode.CancelRequested);
}
In M1 × M2 the guarded update rule of Cancel is the same as in M2, because in M1
Cancel is a self-loop. The following is a trace of M1 × M2:
ReqSetup(3)
ResSetup(3,_,STATUS("Completed"))
ReqWork(7)
Cancel(7)
ResWork(7,_,STATUS("Completed"))
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