Skill: Coverage Mapping

Overview

This skill maps product features to test coverage:

• Feature coverage analysis
• Risk-based coverage mapping
• Gap identification
• Coverage recommendations

Purpose

Understand what features are tested and at what level. Use this skill:

• For release planning
• During risk assessment
• To identify testing gaps
• For coverage optimization

Execution Flow

1. INVENTORY product features
2. ANALYZE test coverage
3. MAP features to tests
4. CALCULATE coverage levels
5. IDENTIFY gaps
6. ASSESS risk
7. GENERATE recommendations

Input Parameters

Parameter	Type	Description	Required
featurePath	string	Path to feature list	No
coveragePath	string	Path to coverage report	No
riskModel	string	Risk model to use	No

Coverage Levels

Level	Description	Criteria
Full	Complete coverage	All paths, all cases
High	Good coverage	Main paths + edge cases
Medium	Basic coverage	Happy path only
Low	Minimal coverage	Few tests
None	No coverage	No tests

Output Format

# Coverage Mapping Report

**Product:** MyApplication v2.1.0
**Features:** 42
**Generated:** [timestamp]

## Coverage Summary

| Coverage Level | Features | Percentage |
|----------------|----------|------------|
| Full | 12 | 29% |
| High | 15 | 36% |
| Medium | 8 | 19% |
| Low | 4 | 9% |
| None | 3 | 7% |

## Coverage by Category

| Category | Full | High | Medium | Low | None |
|----------|------|------|--------|-----|------|
| Authentication | 4 | 1 | - | - | - |
| User Management | 2 | 3 | 1 | - | - |
| Payments | 3 | 2 | - | - | - |
| Reporting | 1 | 4 | 2 | 1 | - |
| Admin | 2 | 3 | 3 | 2 | 1 |
| Integration | - | 2 | 2 | 1 | 2 |

## Risk Assessment

### High Risk (Low/No Coverage)

| Feature | Category | Risk Score | Tests | Recommendation |
|---------|----------|------------|-------|----------------|
| Bulk Import | User Mgmt | 85 | 0 | Add 5+ tests |
| Audit Log | Admin | 78 | 1 | Add 3+ tests |
| Webhook Delivery | Integration | 72 | 0 | Add 4+ tests |

### Medium Risk (Medium Coverage)

| Feature | Category | Risk Score | Tests | Recommendation |
|---------|----------|------------|-------|----------------|
| Report Export | Reporting | 45 | 3 | Add edge cases |
| User Roles | Admin | 42 | 4 | Add permission tests |
| Email Templates | Integration | 38 | 2 | Add rendering tests |

## Feature Coverage Details

### Authentication (100% Coverage)

| Feature | Coverage | Tests | Lines |
|---------|----------|-------|-------|
| Email Login | Full | 8 | 95% |
| SSO Login | Full | 6 | 92% |
| Password Reset | High | 5 | 88% |
| Session Management | Full | 7 | 94% |
| MFA | High | 4 | 85% |

### Payments (92% Coverage)

| Feature | Coverage | Tests | Lines |
|---------|----------|-------|-------|
| Credit Card | Full | 12 | 96% |
| PayPal | High | 6 | 88% |
| Refunds | High | 5 | 85% |
| Invoices | High | 4 | 82% |
| Subscriptions | Full | 8 | 92% |

### Integration (58% Coverage)

| Feature | Coverage | Tests | Lines |
|---------|----------|-------|-------|
| API v1 | Full | 10 | 94% |
| API v2 | High | 8 | 88% |
| Webhooks | None | 0 | 0% |
| Email Service | Medium | 3 | 65% |
| SMS Service | Low | 1 | 30% |

## Gap Analysis

### Critical Gaps

1. **Webhook Delivery (0% coverage)**
   - Risk: High
   - Business Impact: Customer notifications fail silently
   - Recommended Tests: 5
   - Estimated Effort: 4 hours

2. **Bulk Import (0% coverage)**
   - Risk: High
   - Business Impact: Data corruption in production
   - Recommended Tests: 6
   - Estimated Effort: 6 hours

### Recommended Test Additions

| Priority | Feature | Tests Needed | Effort |
|----------|---------|--------------|--------|
| P1 | Webhook Delivery | 5 | 4h |
| P1 | Bulk Import | 6 | 6h |
| P2 | Audit Log | 4 | 3h |
| P2 | SMS Service | 3 | 2h |
| P3 | Report Export | 2 | 1h |

## Coverage Trend

| Week | Full | High | Medium | Low | None |
|------|------|------|--------|-----|------|
| W1 | 25% | 30% | 20% | 15% | 10% |
| W2 | 27% | 32% | 20% | 14% | 7% |
| W3 | 28% | 34% | 19% | 12% | 7% |
| W4 | 29% | 36% | 19% | 9% | 7% |

## Coverage Recommendations

1. **Immediate:** Add tests for webhook delivery (0% → 80%)
2. **Immediate:** Add tests for bulk import (0% → 80%)
3. **This Week:** Improve audit log coverage (20% → 70%)
4. **This Month:** Improve integration coverage (58% → 80%)

Example Usage

Example 1: Full Coverage Map

USER: /coverage-mapping

SKILL OUTPUT:
# Coverage Mapping Report

## Summary
- 42 features analyzed
- 65% have high/full coverage
- 3 critical gaps identified

## Top Recommendations
1. Add webhook tests (Risk: 85)
2. Add bulk import tests (Risk: 78)
3. Add audit log tests (Risk: 72)

Example 2: Risk-Based Analysis

USER: /coverage-mapping --risk

SKILL OUTPUT:
# Risk-Based Coverage Analysis

## Risk Distribution

| Risk Level | Features | Action |
|------------|----------|--------|
| Critical | 3 | Immediate testing |
| High | 5 | Priority testing |
| Medium | 8 | Scheduled testing |
| Low | 26 | Maintain coverage |

## Critical Risk Features

1. **Webhook Delivery** - 0% coverage
   - Impact: Customer notifications
   - Likelihood: High failure rate
   - Risk Score: 85/100

2. **Bulk Import** - 0% coverage
   - Impact: Data integrity
   - Likelihood: Medium failure rate
   - Risk Score: 78/100

Example 3: Category Focus

USER: /coverage-mapping --category Integration

SKILL OUTPUT:
# Coverage Map: Integration Category

## Features (5)

| Feature | Coverage | Tests | Gap |
|---------|----------|-------|-----|
| API v1 | Full | 10 | - |
| API v2 | High | 8 | - |
| Webhooks | None | 0 | Critical |
| Email | Medium | 3 | Warning |
| SMS | Low | 1 | Warning |

## Category Coverage: 58%

**Target:** 80%
**Gap:** 22%
**Tests Needed:** ~15

Feature Coverage Template

feature:
  id: FEAT-001
  name: User Authentication
  category: Authentication
  risk: High
  coverage:
    level: Full
    percentage: 95%
    tests: 8
    lastUpdated: 2026-02-17
  mapping:
    requirements:
      - REQ-001
      - REQ-002
    testCases:
      - TC-001
      - TC-002
      - TC-003
    codePaths:
      - src/auth/login.ts
      - src/auth/session.ts

Risk Model

interface RiskModel {
    factors: {
        businessImpact: number;    // 1-10
        failureLikelihood: number; // 1-10
        codeComplexity: number;    // 1-10
        usageFrequency: number;    // 1-10
    };
    calculate(): number; // Returns risk score 0-100
}

// Risk = (Impact × Likelihood × Complexity × Frequency) / 40 × 100

Configuration

{
    "coverageMapping": {
        "featuresPath": "docs/features.yaml",
        "coverageReportPath": "coverage/coverage-final.json",
        "riskModel": "default",
        "thresholds": {
            "full": 90,
            "high": 75,
            "medium": 50,
            "low": 25
        },
        "riskWeights": {
            "businessImpact": 0.4,
            "failureLikelihood": 0.3,
            "codeComplexity": 0.2,
            "usageFrequency": 0.1
        }
    }
}

Best Practices

1. Prioritize by Risk - Test high-risk features first
2. Track Trends - Monitor coverage over time
3. Set Targets - Define coverage goals by category
4. Review Gaps - Regularly review uncovered features
5. Automate - Run coverage mapping in CI/CD

Integration

This skill integrates with:

• coverage-analysis: Line/branch coverage data
• spec-traceability: Requirement coverage
• Risk management tools
• Release planning tools