A state transition diagram describes a control system’s behavior in different operational modes. The initial state is“NORMAL MODE”.
Which ONE of the following test cases covers anINVALID sequence?
NORMAL MODE → DIAGNOSTIC MODE → DEGRADED MODE → EMERGENCY MODE → DIAGNOSTIC MODE → NORMAL MODE → DIAGNOSTIC MODE
NORMAL MODE → DEGRADED MODE → NORMAL MODE → DIAGNOSTIC MODE → DEGRADED MODE → EMERGENCY MODE → DIAGNOSTIC MODE
NORMAL MODE → DIAGNOSTIC MODE → DEGRADED MODE → EMERGENCY MODE → DIAGNOSTIC MODE → NORMAL MODE → DEGRADED MODE
NORMAL MODE → DIAGNOSTIC MODE → NORMAL MODE → DIAGNOSTIC MODE → EMERGENCY MODE → DIAGNOSTIC MODE → NORMAL MODE
State transition testing validatesvalid and invalid state transitionsbased on defined rules.
D is invalidbecause it transitionsfrom DIAGNOSTIC MODE directly to EMERGENCY MODE, which isnot a valid state changein most systems.
Other options follow valid sequences according tostate transition rules.
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