State transition testing is a testing technique used to verify how a system behaves when moving between different states based on user actions or system events. Many applications operate through defined workflows where the system’s response depends on its current state. This method ensures that each transition between states follows the expected rules and produces the correct outcome.

In state transition testing, testers identify possible states of the system and the events that trigger movement from one state to another. These states and transitions are often represented through state diagrams or state tables. Test cases are then created to validate both valid transitions and invalid ones, ensuring that the system handles each scenario appropriately.

This testing technique is particularly useful for applications with structured processes, such as login systems, transaction processing, and workflow management tools. By thoroughly verifying state changes, state transition testing helps uncover logical flaws and ensures that the system behaves consistently across different sequences of events.