junit4

Generate JUnit 4 test templates for Java 8 projects.

Updated Apr 15, 2026
One-click install
npx skills add https://github.com/philmcneely/tdd-coach-public --skill junit4
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: junit4
Source: https://github.com/philmcneely/tdd-coach-public/tree/main/frameworks/junit4
Command: npx skills add https://github.com/philmcneely/tdd-coach-public --skill junit4

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill provides structured guidance and templates for writing solid JUnit 4 tests in Java 8, reducing boilerplate and preventing common testing mistakes.

Core Features & Use Cases

  • Test structure templates: Pre-built patterns for setup, teardown, and test lifecycle annotations (Before, After, BeforeClass, AfterClass).
  • Mockito integration: Demonstrates standard mocking, stub setup, and verification flows without Spring.
  • Parameterized testing & categories: Examples of Parameterized tests and @Category usage for test organization.
  • Best practices & conventions: Guidance on naming, exception testing, and assertion styles (AssertJ).

Quick Start

Create a sample JUnit 4 test class in Java 8 using the provided patterns to verify a simple method.

Frequently Asked Questions about junit4

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I structure a JUnit 4 test class using setup and teardown lifecycle annotations?

Structure JUnit 4 test classes using lifecycle annotations like @Before, @After, @BeforeClass, and @AfterClass. This Skill provides structured templates to manage setup and teardown, reducing boilerplate and preventing common test lifecycle mistakes in Java 8 projects.

What is the best way to write parameterized tests in Java 8 without Spring?

The best way to write parameterized tests in Java 8 without Spring is using JUnit 4 Parameterized runners. This Skill provides concrete templates and examples for parameterized testing, along with @Category usage for organizing and filtering test suites.

Can I use Mockito to mock dependencies and AssertJ for assertions in JUnit 4?

Yes, you can use Mockito to mock dependencies and AssertJ for assertions in JUnit 4. This Skill demonstrates standard Mockito mocking, stub setup, and verification flows, while providing best practices for AssertJ assertion styles and naming conventions.

How do I test exceptions in JUnit 4 tests for Java 8 applications?

Test exceptions in JUnit 4 tests by applying specific assertion patterns and best practices. This Skill delivers concrete templates and guidance for writing exception assertions, ensuring proper test structure and preventing common edge case mistakes in Java 8.

Does this JUnit 4 testing guidance apply to Java projects using Spring?

No, this JUnit 4 testing guidance does not apply to Java projects using Spring. It specifically targets Java 8 projects without Spring, focusing on pure JUnit 4 test structures, Mockito mocks, parameterized tests, and AssertJ assertions.

Why use JUnit 4 testing patterns for Java 8 instead of other testing frameworks?

Use JUnit 4 testing patterns for Java 8 to leverage established setup/teardown lifecycles, Mockito integration, and parameterized tests. This approach provides structured templates and best practices that reduce boilerplate and prevent common testing mistakes without requiring Spring.