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The Given-When-Then formula is a template intended to guide the writing of acceptance tests for a User Story: (Given) some context (When) some action is carried out (Then) a particular set of observable consequences should obtain; An example: Given my bank account is in credit, and I made no withdrawals recently,
When writing acceptance criteria in this format, it provides a consistent structure. Additionally, it helps testers determine when to begin and end testing for that specific work item. Sometimes itâs difficult to construct criteria using the given, when, then, format.