Avoid branching logic

Performances are written a lot like scripts. Where possible, Performables should avoid branching or looping logic. This is particularly true when Screenplay is being used as a tool for testing. Good test logic has a cyclomatic complexity of precisely one.

Sometimes looping logic is unavoidable and desirable in a Screenplay, imagine a performable which has an Actor repeat a process N times. This is acceptable if used judiciously.

Performables should always avoid branching logic like if or switch though, and should never contain such logic when being used for tests. If more than one mode of operation is required then write more than one performable. The path through a Performance should be completely deterministic, short of an unexpected error or failure.