Unit Test Utility Methods

This generates JUnit 5 test patterns for utility classes and static methods where you don't need mocks. It covers the usual suspects: string manipulation, math helpers, validators, collection utilities. You get AssertJ assertions and parameterized test examples for testing null handling, edge cases, and boundary conditions. The skill pushes you toward descriptive test names and actually testing empty strings, whitespace, and max values instead of just happy paths. It's straightforward for pure functions but includes a rare Clock example when you do need a dependency. The constraints section is honest about floating point comparisons and thread safety, which saves you from common mistakes.

skills.sh installs: 3.9K
GitHub stars: 369
last updated: Aug 21, 2026

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Install

$ npx -y skills add giuseppe-trisciuoglio/developer-kit --skill unit-test-utility-methods --agent claude-code

Installs into .claude/skills of the current project.

Files

Unit Testing Utility Classes and Static Methods

Overview

This skill generates tests for utility classes with static helper methods and pure functions. It provides patterns for testing null handling, edge cases, boundary conditions, and common utilities like string manipulation, calculations, data validation, and collections. Pure functions require no mocking.