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name: gherkin-authoring description: Expert in authoring Gherkin-compliant behavior specifications (Given, When, Then). Use when defining executable scenarios for feature specifications or acceptance tests.

Gherkin Scenario Authoring

What is it?

This skill provides expertise in writing executable behavior specifications using Gherkin syntax. It translates user requirements into structured, unambiguous scenarios that serve as both documentation and automated tests.

Why use it?

• Eliminate Ambiguity: Forced structure (Given/When/Then) clarifies expectations.
• Executable Documentation: Scenarios can be verified automatically by tools like Cucumber.
• Shared Language: Simple keywords allow product, engineering, and non-technical stakeholders to collaborate on the same artifact.

How to use it?

Step 1: Define the Feature Context

Start with the Feature: keyword to group related scenarios. Use Rule: to represent specific business logic if needed.

Step 2: Establish Preconditions (Given)

Use Given to describe the initial state of the system. Avoid user interactions here; focus on system state (e.g., "Given the user is logged in").

Step 3: Describe the Action (When)

Use When to describe the trigger or event (e.g., "When the user clicks 'Submit'").

Step 4: Define the Outcome (Then)

Use Then to describe the observable result (e.g., "Then the confirmation message is displayed"). Use assertions (e.g., "should", "must") implicitly or explicitly.

Step 5: Leverage Advanced Keywords

• Use Background: for common preconditions.
• Use Scenario Outline: and Examples: for testing multiple data variations.
• Use Doc Strings (triple quotes) or Data Tables for complex inputs.

Examples

Scenario Outline: User Authentication

CopyFeature: User Login

  Scenario Outline: Successful login with valid credentials
    Given the login page is open
    When I enter "<username>" and "<password>"
    And I click "Login"
    Then I should be redirected to the "<target_page>"

    Examples:
      | username | password | target_page |
      | admin    | secret12 | dashboard   |
      | user     | pass456  | home        |

Supporting References

• GHERKIN_REFERENCE.md - Detailed Gherkin keyword documentation.

Limitations

• Syntactic Only: This skill helps authoring but does not execute tests or verify step definitions.
• Abstraction Level: Avoid tying scenarios too closely to UI implementation details (e.g., use "login" instead of "click the blue button at the top right").