JUnit 5

JUnit is the programmer-friendly testing framework for Java and the JVM. JUnit 5 is the current major version, composed of the JUnit Platform, JUnit Jupiter, and JUnit Vintage.

When to Use

• Java Projects: The standard. Spring Boot starts with spring-boot-starter-test which includes JUnit 5.
• Unit & Integration: From testing a single method to spinning up a database context (with Testcontainers).

Quick Start (JUnit 5 / Jupiter)

import static org.junit.jupiter.api.Assertions.assertEquals;
import org.junit.jupiter.api.Test;

class CalculatorTest {