Does this skill help with code coverage regression?

Yes, it establishes a coverage baseline before starting and verifies that coverage stays the same or increases after improvements are applied.

What happens if an automated test improvement causes a test to fail?

The workflow includes a verification step after every batch of changes. If tests fail, the skill will attempt to rollback the changes and notify you to prevent a broken test suite.

Does this skill change my app's production code?

By default, no. The skill is strictly constrained to modify only test files. If it discovers a genuine production bug during the process, it will pause and request your explicit approval before applying a fix.

Can I target specific areas of my project for test improvement?

Yes, you can use the 'workspace' parameter to focus on a specific directory or the 'priority' parameter to only address high-impact testing gaps.

JS Test Maintainer

Name: JS Test Maintainer
Author: cuioss

bycuioss

•

Security & Testing

Orchestrates systematic JavaScript test quality improvements and coverage enhancements while strictly maintaining production code integrity.

The JS Test Maintainer skill provides a rigorous, automated workflow for upgrading JavaScript test suites within the Claude Code environment. It identifies test anti-patterns, fills coverage gaps, and refactors test code for better maintainability using the Plan Marshall orchestration layer. By enforcing a strict 'no production changes' rule—except for user-approved bug fixes—it ensures that test suite maturation never accidentally alters application behavior. This skill is ideal for teams looking to standardize testing patterns, increase reliability, and ensure high-quality test documentation across complex JavaScript workspaces.

Key Features

01Priority-based improvement execution (High, Medium, Low)

02Automated coverage baseline generation and regression monitoring

03Comprehensive summary reporting of improvements, fixes, and coverage deltas

041 GitHub stars

05Strict production code protection with explicit bug-fix approval gates

06Systematic test quality auditing against professional standards

Use Cases

01Increasing code coverage for critical business logic without risking production regressions

02Refactoring legacy test suites to follow modern Arrange-Act-Assert (AAA) patterns

03Standardizing test helpers, factories, and mock management across multiple workspaces

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add cuioss/plan-marshall js-maintain-tests

For use in Claude.ai and ChatGPT

Download Skill