jellytau/TRACES_QUICK_REF.md
Duncan Tourolle 57f8a54dac Add comprehensive test coverage for services and utilities
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
2026-02-14 08:08:22 +01:00

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# TRACES Quick Reference Guide
## What are TRACES?
TRACES are requirement identifiers embedded in code comments to track which requirements are implemented where.
Format: `// TRACES: UR-001, UR-002 | DR-003`
## Quick Examples
### TypeScript
```typescript
// TRACES: UR-005, UR-026 | DR-029
export function handlePlayback() { }
/**
* Resume playback from saved position
* TRACES: UR-019 | DR-022
*/
export async function resumePlayback(itemId: string) { }
```
### Svelte
```svelte
<!-- TRACES: UR-007, UR-008 | DR-007 -->
<script>
export let items = [];
</script>
```
### Rust
```rust
/// TRACES: UR-005 | DR-001
pub enum PlayerState { ... }
#[test]
fn test_queue_next() {
// TRACES: UR-005 | DR-005 | UT-003
}
```
## Requirement Types
| Type | Meaning | Example |
|------|---------|---------|
| **UR** | User Requirement | UR-005: Control media playback |
| **IR** | Integration Requirement | IR-003: LibMPV integration |
| **DR** | Development Requirement | DR-001: Player state machine |
| **JA** | Jellyfin API Requirement | JA-007: Get playback info |
| **UT** | Unit Test | UT-001: Player state transitions |
| **IT** | Integration Test | IT-003: Audio playback via libmpv |
## Where to Find Requirements
1. **User Requirements (UR):** [README.md](README.md#1-user-requirements)
2. **Integration Requirements (IR):** [README.md](README.md#21-integration-requirements)
3. **Development Requirements (DR):** [README.md](README.md#23-development-requirements)
4. **Jellyfin API (JA):** [README.md](README.md#22-jellyfin-api-requirements)
## How to Add TRACES
### Step 1: Find the Requirement
Look up the requirement in README.md or the traceability matrix.
Example: `UR-005: Control media playback (pause, play, skip, scrub)`
### Step 2: Add Comment
Add TRACES comment at the top of the function/type/module:
```typescript
// TRACES: UR-005
export async function playMedia(itemId: string) {
// Implementation
}
```
### Step 3: Run Extraction
Verify the trace is captured:
```bash
bun run traces:json | jq '.requirements | keys | grep "UR-005"'
```
## Common Patterns
### Single Requirement
```typescript
// TRACES: UR-005
function handlePlay() { }
```
### Multiple Requirements, Same Type
```typescript
// TRACES: UR-005, UR-026, UR-019
function handlePlaybackState() { }
```
### Multiple Types
```typescript
// TRACES: UR-005, UR-026 | DR-029
function autoplayNextEpisode() { }
```
### Test Coverage
```typescript
// TRACES: UR-005 | UT-001
#[test]
fn test_player_state_transition() { }
```
### Modules/Files
```typescript
/**
* Player event handling
* TRACES: UR-005, UR-019, UR-023 | DR-001, DR-028
*/
```
## Validation
### Check Your Changes
```bash
# View current coverage
bun run traces:json | jq '.byType'
# Generate full report
bun run traces:markdown
# Check specific requirement
bun run traces:json | jq '.requirements."UR-005"'
```
### Before Committing
1. Ensure all new code has TRACES
2. Format is correct: `// TRACES: ...`
3. Requirements exist in README.md
4. No typos in requirement IDs
## CI/CD Validation
The workflow automatically checks:
- ✅ Coverage stays >= 50%
- ✅ New files have TRACES
- ✅ JSON format is valid
- ✅ Reports are generated
See [TRACEABILITY_CI.md](docs/TRACEABILITY_CI.md) for details.
## Tips & Tricks
### Find Related Code
```bash
# Find all code tracing to UR-005
bun run traces:json | jq '.requirements."UR-005"'
# List all tests
bun run traces:json | jq '.requirements | keys | map(select(startswith("UT")))'
```
### Update Your Editor
**VS Code:**
```json
{
"editor.wordBasedSuggestions": false,
"editor.suggest.custom": [
{
"name": "TRACES Format",
"insertText": "// TRACES: $1",
"insertTextRules": "InsertAsSnippet"
}
]
}
```
### Find Untraced Code
```bash
# Files modified without TRACES
git diff --name-only | xargs grep -L "TRACES:" | head -10
```
## FAQ
**Q: Do I need TRACES on every function?**
A: Only for code that implements requirements. Internal helpers don't need TRACES.
**Q: Can I use TRACES on multiple related functions?**
A: Yes! Add at the file/module level or on individual functions.
**Q: What if code doesn't relate to any requirement?**
A: Leave it untraced. TRACES are for requirement-driven development.
**Q: How often should I regenerate reports?**
A: Automatically on push (CI/CD). Manually after changes: `bun run traces:markdown`
**Q: Can I trace to requirements that aren't implemented yet?**
A: Yes! TRACES show your implementation plan.
## See Also
- [Full Traceability Matrix](docs/TRACEABILITY.md)
- [CI/CD Pipeline Guide](docs/TRACEABILITY_CI.md)
- [Requirements Specification](README.md)
- [Extraction Script](scripts/README.md#extract-tracests)
---
**Quick Start:**
1. Add `// TRACES: UR-XXX` to new code
2. Run `bun run traces:markdown`
3. Check `docs/TRACEABILITY.md`
4. Submit PR - workflow validates automatically!