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---
name: tdd-stub-first
description: Test-Driven Development with Stub-First approach.
tier: 1
version: 1.1
---
# TDD & Stub-First Strategy
## 1. Stubbing Phase
1. **Create Structure:** Files, classes, methods.
2. **Implement Stubs:** Use `NotImplementedError`, `return None`, or hardcoded values.
3. **Docstrings:** Add detailed docstrings describing future logic.
4. **E2E Test (Stub):** Write an E2E test that asserts the hardcoded behavior.
- *Example:* asserting `discount == 100.0` (stubbed value).
5. **Scope:** the stubbing phase touches the component — its files, classes, tests and fixtures.
Proxy or container configuration, resource limits, performance budgets and hardening are not
stubs; they are separate tasks reviewed as infrastructure.
## 2. Implementation Phase
1. **Verify Stubs:** Ensure E2E test passes on stubs.
2. **Replace Stubs:** Implement real logic.
3. **Unit Tests:** Add unit tests for specific methods and edge cases.
4. **Update E2E:** Update E2E test to assert real behavior.
- *Example:* asserting `discount == 150.0` (calculated value).
## 3. Testing Rules
- **No Mocking LLMs:** Use recorded responses or separate integration environments.
- **Regression:** Always run full regression suite.
