JUnit Setup Maven – JUnit 4 and JUnit 5

JUnit 4 and JUnit 5 are completely different frameworks. They both serve the same purpose, but the JUnit 5 is a completely different testing framework written from scratch. It’s not using anything from JUnit 4 APIs.

Here we will look into how to setup JUnit 4 and JUnit 5 in our maven projects.

JUnit Maven Dependencies

If you want to use JUnit 4, then you need a single dependency as below.

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<dependency>
	<groupId>junit</groupId>
	<artifactId>junit</artifactId>
	<version>4.12</version>
	<scope>test</scope>
</dependency>

JUnit 5 is divided into several modules, you need at least JUnit Platform and JUnit Jupiter to write tests in JUnit 5. Also, note that JUnit 5 requires Java 8 or higher versions.

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<dependency>
	<groupId>org.junit.jupiter</groupId>
	<artifactId>junit-jupiter-engine</artifactId>
	<version>5.2.0</version>
	<scope>test</scope>
</dependency>
<dependency>
	<groupId>org.junit.platform</groupId>
	<artifactId>junit-platform-runner</artifactId>
	<version>1.2.0</version>
	<scope>test</scope>
</dependency>

If you want to run parameterized tests, then you need to add an additional dependency.

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<dependency>
	<groupId>org.junit.jupiter</groupId>
	<artifactId>junit-jupiter-params</artifactId>
	<version>5.2.0</version>
	<scope>test</scope>
</dependency>

JUnit Tests During Maven Build

If you want the tests to be executed during the maven build, you will have to configure maven-surefire-plugin plugin in your pom.xml file.

JUnit 4:

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<build>
	<plugins>
		<plugin>
			<groupId>org.apache.maven.plugins</groupId>
			<artifactId>maven-surefire-plugin</artifactId>
			<version>2.22.0</version>
			<dependencies>
				<dependency>
					<groupId>org.apache.maven.surefire</groupId>
					<artifactId>surefire-junit4</artifactId>
					<version>2.22.0</version>
				</dependency>
			</dependencies>
			<configuration>
				<includes>
					<include>**/*.java</include>
				</includes>
			</configuration>
		</plugin>
	</plugins>
</build>

JUnit 5:

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<build>
	<plugins>
		<plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-surefire-plugin</artifactId>
           <version>2.22.0</version>
           <dependencies>
               <dependency>
                   <groupId>org.junit.platform</groupId>
                   <artifactId>junit-platform-surefire-provider</artifactId>
                   <version>1.2.0</version>
               </dependency>
           </dependencies>
           <configuration>
           	<additionalClasspathElements>
           		<additionalClasspathElement>src/test/java/</additionalClasspathElement>
           	</additionalClasspathElements>
           </configuration>
       </plugin>
	</plugins>
</build>

JUnit HTML Reports

Maven surefire plugin generates text and XML reports, we can generate HTML based reports using maven-surefire-report-plugin. Below configuration works for both JUnit 4 and JUnit 5.

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<reporting>
	<plugins>
		<plugin>
			<groupId>org.apache.maven.plugins</groupId>
			<artifactId>maven-surefire-report-plugin</artifactId>
			<version>2.22.0</version>
		</plugin>
	</plugins>
</reporting>

Just run mvn site command and the HTML report will be generated in the target/site/ directory.

That’s all for a quick roundup of JUnit setup for maven projects.

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