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Junit 5 with Maven example

July 4, 2022

In this Junit 5 maven article we will see how to configure Junit 5 dependencies in your Maven projects and how to run over maven commands and from your IDE like eclipse or STS (Spring tool suite).

1. Example application

1.1. Technologies used :

Junit 5.5.2
Maven 3
Java 8
Spring Tool Suite 3.9.8

1.2. Maven project

Here is the simple maven project structure to demonstrate Junit 5 and Maven configuration.

2. Add Junit 5 dependencies to your pom.xml

junit-jupiter-engine an api to create Junit 5 test cases.

Add junit-jupiter-engine maven dependency and maven-surefire-plugin maven plugin to maven pom.xml. Your pom.xml looks like below.

<project xmlns="http://maven.apache.org/POM/4.0.0"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.javabydeveloper</groupId>
	<artifactId>Junit5-maven-example</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>Junit5-maven-example</name>
	<url>https://javabydeveloper.com</url>

	<properties>
		<!-- Dependency versions -->
		<junit.jupiter.version>5.5.2</junit.jupiter.version>
		<maven-surefire-plugin.version>2.22.2</maven-surefire-plugin.version>

		<!-- Java 8 -->
		<java.version>1.8</java.version>

		<!-- Encoding -->
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
	</properties>

	<!-- Jupiter API for writing tests -->
	<dependencies>
		<dependency>
			<groupId>org.junit.jupiter</groupId>
			<artifactId>junit-jupiter-engine</artifactId>
			<version>${junit.jupiter.version}</version>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<!-- Maven Surefire plugin to run tests -->
	<build>
		<plugins>
		   <!-- plugin to run test cases from maven -->
			<plugin>
				<artifactId>maven-surefire-plugin</artifactId>
				<version>${maven-surefire-plugin.version}</version>
			</plugin>
			<!-- Maven plugin to use perticular java version to compile code -->
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.8.1</version>
				<configuration>
					<source>1.8</source>
					<target>1.8</target>
				</configuration>
			</plugin>
		</plugins>
	</build>

</project>

3. A simple MathUtil.java to test with Junit 5

A simple MathUtil.java class with basic methods to calculate math functions.

public class MathUtil {
	
	public static int add(int num1, int num2) {
		return num1 + num2;
	}
	
	public static int multiple(int num1, int num2) {
		return num1 * num2;
	}
	
	public static boolean isEven(int num) {
	    return num%2 == 0;
	}
	
	public static int devide(int num, int by) {
		return num/by;
	}
	
	public static boolean isPrime(int num) {
		for(int i=2; 2*i<num; i++) {
	        if(num%i==0)
	            return false;
	    }
	    return true;
	}
}

4. Writing Junit 5 tests

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

import org.junit.jupiter.api.Test;

public class MathUtilTest {
	
	@Test
	void test_Add() {
		assertEquals(5, MathUtil.add(3, 2));
	}
	
	@Test
	void test_Multiply() {
		assertEquals(15, MathUtil.multiple(3, 5));
	}

	@Test
	void test_Devide() {
		assertEquals(5, MathUtil.devide(25, 5));
	}
	
	@Test
	void testIs_Prime() {
		assertTrue(MathUtil.isPrime(13));
	}
}

5. Run your Junit 5 test in IDE

5.1. In your IDE Eclipse / STS, right click on your Junit 5 test case, go Run As and select Junit Test. Your test case execution will be started.

5.2. Junit 5 test case execution results in IDE :

6. Run using maven command

Run mvn test maven command, the Maven Surefire Plugin will scan and run all the Juint 5 test cases and you see the test cases execution results in console.

6.1. Console Output

[INFO] 
[INFO] --- maven-surefire-plugin:2.22.2:test (default-test) @ Junit5-maven-example ---
[INFO] 
[INFO] -------------------------------------------------------
[INFO]  T E S T S
[INFO] -------------------------------------------------------
[INFO] Running com.javabydeveloper.util.MathUtilTest
[INFO] Tests run: 4, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.048 s - in com.javabydeveloper.util.MathUtilTest
[INFO] 
[INFO] Results:
[INFO] 
[INFO] Tests run: 4, Failures: 0, Errors: 0, Skipped: 0
[INFO] 
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 5.125 s
[INFO] Finished at: 2019-12-27T12:14:23+08:00
[INFO] ------------------------------------------------------------------------

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