Can I set a specific coverage target?

The skill is currently pre-configured to target an 80% coverage threshold, identifying any files falling below this mark for improvement.

Does it support end-to-end testing?

Yes, beyond simple unit tests, it can generate integration tests for APIs and E2E tests for critical user flows.

Which testing frameworks does this skill work with?

This skill is optimized for JavaScript and TypeScript projects using npm or pnpm that generate a standard coverage-summary.json report.

How does it handle complex edge cases?

The skill specifically analyzes untested code paths to generate scenarios for null, undefined, empty values, and boundary conditions.

Test Coverage Optimizer

Name: Test Coverage Optimizer
Author: sc30gsw

bysc30gsw

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Security & Testing

Analyzes code coverage reports and generates comprehensive unit, integration, and E2E tests to reach an 80% coverage threshold.

The Test Coverage Optimizer skill enables Claude to autonomously improve your project's reliability by identifying and filling testing gaps. By parsing standard coverage reports, it pinpoints under-tested files and logic branches, then generates high-quality test cases for happy paths, complex edge cases, and boundary conditions. This skill is ideal for developers looking to harden legacy codebases or ensure new features meet strict quality standards before deployment, providing before-and-after metrics to verify progress.

Key Features

01Targeted coverage improvements to reach 80%+ thresholds

02Automated analysis of coverage-summary.json reports

03Comparison metrics showing coverage improvements before and after execution

048 GitHub stars

05Multi-level test generation including unit, integration, and E2E

06Specific focus on edge cases, null/undefined checks, and boundary conditions

Use Cases

01Generating automated tests for new feature branches before PR submission

02Hardening critical API endpoints with missing integration and error-handling tests

03Increasing test coverage in legacy JavaScript or TypeScript projects

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add sc30gsw/claude-code-customes test-coverage

For use in Claude.ai and ChatGPT

Download Skill