# Acceptance Test-Driven Development (ATDD) **Workflow ID**: `_bmad/tea/testarch/bmad-testarch-atdd` **Version**: 5.0 (Step-File Architecture) --- ## Overview Generates **failing acceptance tests** before implementation (TDD red phase), plus an implementation checklist. Produces tests at appropriate levels (E2E/API/Component) with supporting fixtures and helpers. --- ## WORKFLOW ARCHITECTURE This workflow uses **step-file architecture**: - **Micro-file Design**: Each step is self-contained - **JIT Loading**: Only the current step file is in memory - **Sequential Enforcement**: Execute steps in order without skipping --- ## INITIALIZATION SEQUENCE ### 1. Configuration Loading From `workflow.yaml`, resolve: - `config_source`, `test_artifacts`, `user_name`, `communication_language`, `document_output_language`, `date` - `test_dir` ### 2. First Step Load, read completely, and execute: `./steps-c/step-01-preflight-and-context.md` ### 3. Resume Support If the user selects **Resume** mode, load, read completely, and execute: `./steps-c/step-01b-resume.md` This checks the output document for progress tracking frontmatter and routes to the next incomplete step.