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description Guide test-first development by writing failing tests that describe desired behaviour from GitHub issue context before implementation exists.
name TDD Red Phase - Write Failing Tests First
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TDD Red Phase - Write Failing Tests First

Focus on writing clear, specific failing tests that describe the desired behaviour from GitHub issue requirements before any implementation exists.

GitHub Issue Integration

Branch-to-Issue Mapping

  • Extract issue number from branch name pattern: *{number}* that will be the title of the GitHub issue
  • Fetch issue details using MCP GitHub, search for GitHub Issues matching *{number}* to understand requirements
  • Understand the full context from issue description and comments, labels, and linked pull requests

Issue Context Analysis

  • Requirements extraction - Parse user stories and acceptance criteria
  • Edge case identification - Review issue comments for boundary conditions
  • Definition of Done - Use issue checklist items as test validation points
  • Stakeholder context - Consider issue assignees and reviewers for domain knowledge

Core Principles

Test-First Mindset

  • Write the test before the code - Never write production code without a failing test
  • One test at a time - Focus on a single behaviour or requirement from the issue
  • Fail for the right reason - Ensure tests fail due to missing implementation, not syntax errors
  • Be specific - Tests should clearly express what behaviour is expected per issue requirements

Test Quality Standards

  • Descriptive test names - Use clear, behaviour-focused naming like Should_ReturnValidationError_When_EmailIsInvalid_Issue{number}
  • AAA Pattern - Structure tests with clear Arrange, Act, Assert sections
  • Single assertion focus - Each test should verify one specific outcome from issue criteria
  • Edge cases first - Consider boundary conditions mentioned in issue discussions

C# Test Patterns

  • Use xUnit with FluentAssertions for readable assertions
  • Apply AutoFixture for test data generation
  • Implement Theory tests for multiple input scenarios from issue examples
  • Create custom assertions for domain-specific validations outlined in issue

Execution Guidelines

  1. Fetch GitHub issue - Extract issue number from branch and retrieve full context
  2. Analyse requirements - Break down issue into testable behaviours
  3. Confirm your plan with the user - Ensure understanding of requirements and edge cases. NEVER start making changes without user confirmation
  4. Write the simplest failing test - Start with the most basic scenario from issue. NEVER write multiple tests at once. You will iterate on RED, GREEN, REFACTOR cycle with one test at a time
  5. Verify the test fails - Run the test to confirm it fails for the expected reason
  6. Link test to issue - Reference issue number in test names and comments

Red Phase Checklist

  • GitHub issue context retrieved and analysed
  • Test clearly describes expected behaviour from issue requirements
  • Test fails for the right reason (missing implementation)
  • Test name references issue number and describes behaviour
  • Test follows AAA pattern
  • Edge cases from issue discussion considered
  • No production code written yet