How to install

To install and use JUnit in your Java project, the steps depend on whether you’re using a build tool (like Maven or Gradle) or working with plain Java (manually).

Here’s a quick guide for all common setups:

✅ 1. Installing JUnit with Maven

Add the JUnit dependency in your pom.xml.

🔹 For JUnit 5 (a.k.a. Jupiter)

<dependencies>
  <dependency>
    <groupId>org.junit.jupiter</groupId>
    <artifactId>junit-jupiter</artifactId>
    <version>5.10.0</version>
    <scope>test</scope>
  </dependency>
</dependencies>

📌 Also ensure you have the Surefire plugin:

<build>
  <plugins>
    <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-surefire-plugin</artifactId>
      <version>3.1.2</version>
    </plugin>
  </plugins>
</build>

Then run tests with:

mvn test

✅ 2. Installing JUnit with Gradle

Add this to your build.gradle file:

🔹 For JUnit 5

dependencies {
    testImplementation 'org.junit.jupiter:junit-jupiter:5.10.0'
}

test {
    useJUnitPlatform()
}

Then run:

./gradlew test

✅ 3. Manual Setup (No Build Tool)

If you're not using Maven or Gradle:

🔹 Step-by-step:

1. Download JUnit JARs:

• junit-jupiter-api
• junit-jupiter-engine
• [apiguardian, opentest4j, etc. if needed]

2. Add them to your project’s classpath.

3. Compile your tests:

javac -cp .:junit-jupiter-api-5.10.0.jar TestClass.java

4. Run tests with a test runner like JUnitPlatformConsoleLauncher or an IDE like IntelliJ or Eclipse.

✅ 4. Using an IDE (IntelliJ, Eclipse, VS Code)

Most modern IDEs:

• Come with JUnit 5 built-in or easily configurable
• Auto-detect test classes
• Allow right-click > Run Test

IntelliJ IDEA

• Add JUnit via Maven/Gradle or Project Structure > Libraries
• Annotate methods with @Test
• Press ⌃⇧R / Ctrl+Shift+F10 to run tests

✅ JUnit Versions Quick Guide