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Executable Specifications with Gherkin: Given-When-Then, Rule, Scenario Outline and Writing Declarative Scenarios

Gherkin turns the rules and examples found in Example Mapping into a specification that stakeholders can read and a test runner can execute; a good scenario describes the business rule, not the UI. Using Bookstore's institutional order rules, we cover Feature, Rule, Background, Scenario Outline, Examples and data tables, declarative versus imperative scenarios, the Turkish keyword decision and Gherkin anti-patterns.