<aside> ⚠️ Note: The code above uses the thingUnderTest_TriggerOfTest_ResultOfTest format to name the test function name:

• thingUnderTest = gameViewModel

• TriggerOfTest = CorrectWordGuessed

• ResultOfTest = ScoreUpdatedAndErrorFlagUnset </aside>

• Success path: The success path tests - also known as happy path tests, focus on testing the functionality for a positive flow. A positive flow is a flow that has no exception or error conditions. Compared to the error path and boundary case scenarios, it is easy to create an exhaustive list of scenarios for success paths, since they focus on intended behavior for your app.

• Error path: The error path tests focus on testing the functionality for a negative flow–that is, to check how the app responds to error conditions or invalid user input. It is quite challenging to determine all the possible error flows because there are lots of possible outcomes when intended behavior is not achieved.

• Boundary case: A boundary case focuses on testing boundary conditions in the app. In the Unscramble app, a boundary is checking the UI state when the app loads and the UI state after the user plays a maximum number of words.