---
name: jordancoin-test-first
description: "TDD workflow using codemap's impact analysis. Write tests before implementation, verify with dependency awareness."
license: "MIT"
metadata:
  decimalai-skill-id: "2a65ca39-a7a5-4659-8c93-2acb58c04104"
  decimalai-version-id: "95b5e358-ce6d-4794-8bc9-0935957e1158"
  decimalai-version: "1"
  decimalai-body-sha256: "fe02c45cb1216b8d188d1af599cd612b7e47322c8cee8466e98c5c265becda2f"
  decimalai-name: "jordancoin/test-first"
  decimalai-format: "1"
  decimalai-invocation: "model"
  decimalai-category: "testing"
  decimalai-source: "https://app.decimal.ai/s/jordancoin-test-first@1/SKILL.md"
---
# Test-First Development with Code Intelligence

## The cycle

1. **Write a failing test** for the behavior you want
2. **Run the test** to confirm it fails for the right reason
3. **Implement** the minimum code to make it pass
4. **Run all tests** (not just the new one)
5. **Check hub impact**: if you touched a hub file, run importer tests too

## Using codemap for test planning

- `codemap --importers <file>`: which files depend on what you're testing?
- `codemap --deps .`: understand the dependency chain before writing mocks
- Working set shows what you've already touched: test those files

## What to test when editing hub files

Hub files affect many dependents. Test:
1. The hub file's own tests
2. Direct importers' tests
3. Integration tests that cross the hub boundary

## Test file conventions

| Language | Convention |
|----------|-----------|
| Go | `*_test.go` in same package |
| TypeScript | `*.test.ts` or `*.spec.ts` |
| Python | `test_*.py` or `*_test.py` |
| Rust | `#[cfg(test)]` module or `tests/` dir |