test-coverage-analyzer

// Analyze test coverage and identify gaps before migration to ensure adequate safety nets

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updated:March 4, 2026

SKILL.mdreadonly

SKILL.md Frontmatter

nametest-coverage-analyzer

descriptionAnalyze test coverage and identify gaps before migration to ensure adequate safety nets

allowed-toolsBash,Read,Write,Grep,Glob,Edit

Test Coverage Analyzer Skill

Analyzes test coverage comprehensively to identify gaps and ensure adequate test safety nets before undertaking migration efforts.

Purpose

Enable comprehensive test coverage analysis for:

Pre-migration coverage assessment
Critical path coverage verification
Coverage gap identification
Test strategy planning
Regression risk assessment

Capabilities

1. Line/Branch/Path Coverage Measurement

Calculate line coverage percentages
Measure branch coverage
Analyze path coverage
Track condition coverage

2. Coverage Gap Identification

Find untested code paths
Identify missing edge cases
Detect uncovered error handlers
Map coverage blind spots

3. Critical Path Coverage Analysis

Identify business-critical paths
Prioritize coverage by importance
Map risk vs coverage
Generate focused test recommendations

4. Integration Test Coverage Mapping

Track integration point coverage
Map API endpoint testing
Assess database operation coverage
Verify external service testing

5. Coverage Trend Analysis

Track coverage over time
Identify coverage regression
Monitor improvement progress
Generate trend reports

Tool Integrations

Tool	Language	Integration Method
Istanbul/nyc	JavaScript/TypeScript	CLI
JaCoCo	Java	CLI / Maven/Gradle
Cobertura	Java/Python	CLI
Coverage.py	Python	CLI
SimpleCov	Ruby	CLI
go test -cover	Go	CLI
dotCover	.NET	CLI

Output Schema

{
  "analysisId": "string",
  "timestamp": "ISO8601",
  "coverage": {
    "line": {
      "percentage": "number",
      "covered": "number",
      "total": "number"
    },
    "branch": {
      "percentage": "number",
      "covered": "number",
      "total": "number"
    },
    "function": {
      "percentage": "number",
      "covered": "number",
      "total": "number"
    }
  },
  "gaps": [
    {
      "file": "string",
      "uncoveredLines": ["number"],
      "uncoveredBranches": ["string"],
      "criticality": "high|medium|low",
      "recommendation": "string"
    }
  ],
  "criticalPaths": {
    "covered": "number",
    "total": "number",
    "uncoveredPaths": []
  }
}

Integration with Migration Processes

migration-testing-strategy: Coverage baseline establishment
code-refactoring: Pre-refactoring safety assessment
framework-upgrade: Regression protection verification

Related Skills

characterization-test-generator: Generate tests for gaps
static-code-analyzer: Combined quality analysis

Related Agents

migration-testing-strategist: Uses for test planning
regression-detector: Uses for regression prevention