In general, for each story or requirement there is a single canonical path through the application in terms of the actions that the user will perform. This is known as the happy path. This is often expressed using the form “Given [a few important characteristics of the state of the system when testing begins], when [the user performs some set of actions], then [a few important characteristics of the new state of the system] will result.” This is sometimes referred to as the “given-when-then” model for tests.
