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 an INVALID 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
Comprehensive and Detailed In-Depth Explanation:
State transition testing validates valid and invalid state transitions based on defined rules.
D is invalid because it transitions from DIAGNOSTIC MODE directly to EMERGENCY MODE, which is not a valid state change in most systems.
Other options follow valid sequences according to state transition rules.
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