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State Transition
What is State Transition Testing?
State Transition Testing is a Black Box Testing technique used to verify how a system behaves when it moves from one state to another based on different inputs or events.
👉 It checks whether the system produces the correct output for valid and invalid state changes
State Transition Testing is a testing technique used to verify that a system behaves correctly when moving from one state to another based on user actions or events.
Definition:-
Purpose of State Transition Testing
1️⃣ To verify system behavior in different states
2️⃣ To test valid and invalid state changes
3️⃣ To ensure the system responds correctly to events
4️⃣ To detect unexpected state transitions
When is State Transition Testing Used?
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When system behavior depends on previous actions
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In login systems, ATM machines, and online transactions
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When applications have multiple states
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While testing workflow-based systems
Structure of a Decision Table
| Component | Description |
|---|---|
| Conditions | Input conditions |
| Actions | System outputs |
| Rules | Combination of conditions |
| Results | Expected outcomes |
Example (ATM Machine)
States of ATM system:
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Card Inserted
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PIN Entered
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Transaction Selected
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Cash Withdrawn
Example transitions:
Example (ATM Machine)
| Current State | Event | Next State |
|---|---|---|
| Card Inserted | Enter PIN | PIN Verification |
| PIN Verified | Select Withdraw | Transaction Processing |
| Transaction Complete | Remove Card | Idle State |
This ensures the system moves correctly from one state to another.
Key Characteristics
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Tests system behavior based on states
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Validates state changes and transitions
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Useful for workflow and sequential systems
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Ensures correct response for user actions
State Transition
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