Junit 5 Skill

Generates production-grade JUnit 5 unit and integration tests in Java. Covers assertions, parameterized tests, lifecycle hooks, mocking with Mockito, and nested tests. Use when user mentions "JUnit", "JUnit 5", "@Test", "assertEquals", "Assertions", "Java unit test". Triggers on: "JUnit", "@Test", "assertEquals", "Java test", "unit test Java".

386 stars 76 forksTesting & QAOfficial

Install

skills CLI (Claude Code, Cursor, Codex and more)
npx skills add LambdaTest/agent-skills --skill junit-5-skill
Manual install
git clone --depth 1 https://github.com/LambdaTest/agent-skills.git /tmp/agent-skills
mkdir -p ~/.claude/skills
cp -r /tmp/agent-skills/junit-5-skill ~/.claude/skills/junit-5-skill

Personal skills live in ~/.claude/skills. Use .claude/skills in a project folder to share a skill with your team.

From the SKILL.md

# JUnit 5 Testing Skill

You are a senior Java developer specializing in JUnit 5 testing.

## Step 1 — Test Type

```
├─ "unit test", "assert" → Standard unit test
├─ "parameterized", "multiple inputs" → @ParameterizedTest
├─ "mock", "Mockito" → Unit test with Mockito
├─ "integration test", "Spring" → Read reference/spring-integration.md
└─ Default → Standard unit test
```

## Core Patterns

### Basic Test

```java
import org.junit.jupiter.api.*;
import static org.junit.jupiter.api.Assertions.*;

class CalculatorTest {
    private Calculator calculator;

    @BeforeEach
    void setUp() {
        calculator = new Calculator();
    }

    @Test
    @DisplayName("Addition of two positive numbers")
    void addPositiveNumbers() {
        assertEquals(5, calculator.add(2, 3));
    }

    @Test
    void divideByZero_throwsException() {
        assertThrows(ArithmeticException.class, () -> calculator.divide(10, 0));
    }

    @Test
    void multipleAssertions() {
        assertAll("calculator operations",
            () -> assertEquals(4, calculator.add(2, 2)),
            () -> assertEquals(0, calculator.subtract(2, 2)),
            () -> assertEquals(6, calculator.multiply(2, 3))
        );
    }
}
```

### Assertions Reference
Read the full skill on GitHub

Details

Skill name
junit-5-skill
Repository
LambdaTest/agent-skills
Path
junit-5-skill/SKILL.md
License
MIT
Repo updated
30 October 2026
Listed in
VoltAgent/awesome-agent-skills

FAQ

What does the Junit 5 Skill skill do?

Generates production-grade JUnit 5 unit and integration tests in Java. Covers assertions, parameterized tests, lifecycle hooks, mocking with Mockito, and nested tests. Use when user mentions "JUnit", "JUnit 5", "@Test", "assertEquals", "Assertions", "Java unit test". Triggers on: "JUnit", "@Test", "assertEquals", "Java test", "unit test Java".

How do I install the Junit 5 Skill skill?

skills CLI (Claude Code, Cursor, Codex and more): npx skills add LambdaTest/agent-skills --skill junit-5-skill. Skills go in ~/.claude/skills (personal) or .claude/skills (project), and Claude loads them automatically when a task matches the description.

Is Junit 5 Skill popular?

It lives in LambdaTest/agent-skills, which has 386 GitHub stars and 76 forks, and is included in 1 curated skill list.

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