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# Acceptance Test-Driven Development (ATDD)

**Workflow ID**: `_bmad/tea/testarch/bmad-testarch-atdd`
**Version**: 5.0 (Step-File Architecture)

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## 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.

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## 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

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## 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.
