Run Both JUnit 4 and Junit5 With Maven Surefire Plugin – 2020

I see a few people having this issue and am struggling for a few weeks now, but not able to run both JUnit4 and JUnit5 on the same project (I need this to maintain some old tests). I noticed that if I remove the maven surefire plugin I can run the JUnit4 tests whereas when it’s added to the POM only the JUnit5 ones.

<plugins>
    <plugin>
       <artifactId>maven-surefire-plugin</artifactId>
       <version>3.0.0-M4</version>
    </plugin>
</plugins>

Similar thing happens to this dependency. If I add it to the POM file I can run JUnit4 tests even if the maven surefire plugin is there. However, I need to remove it to be able to run JUnit5 tests.

<dependency>
    <groupId>org.junit.vintage</groupId>
    <artifactId>junit-vintage-engine</artifactId>
    <version>${junit5.version}</version>
    <scope>test</scope>
</dependency>

This is my complete pom

<?xml version="1.0" encoding="UTF-8"?>
<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.hmhco</groupId>
<artifactId>tests</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>

<properties>
    <java.version>1.8</java.version>
    <maven.compiler.version>3.8.1</maven.compiler.version>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
    <rest-assured.version>3.0.0</rest-assured.version>
    <json-schema-validator.version>3.3.0</json-schema-validator.version>
    <junit5.version>5.2.0</junit5.version>
</properties>

<dependencies>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.junit.vintage</groupId>
        <artifactId>junit-vintage-engine</artifactId>
        <version>${junit5.version}</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.junit.jupiter</groupId>
        <artifactId>junit-jupiter-api</artifactId>
        <version>5.5.2</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>javax.xml.bind</groupId>
        <artifactId>jaxb-api</artifactId>
        <version>2.3.1</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jaxb</groupId>
        <artifactId>jaxb-runtime</artifactId>
        <version>2.3.1</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-simple</artifactId>
        <version>1.7.30</version>
    </dependency>
</dependencies>

<build>
    <plugins>
        <plugin>
            <artifactId>maven-surefire-plugin</artifactId>
            <version>3.0.0-M4</version>
        </plugin>
    </plugins>
</build>

And these are the small classes I’m try to run using mvn test

import org.junit.Test;

public class J4Test {

@Test
public void testing() {
    System.out.println("Testing J4");
    }
}

—

import org.junit.jupiter.api.Test;

public class J5Test {

@Test
public void testing() {
    System.out.println("Testing J5");
    }
}

Answer

We have improved the plugin in the 3.0.0-M5 version so that you do not need to use engines in your dependencies. This new approach avoids using internal code of the engine in your tests and it enables you to only call the API:

Maybe this example and documentation helps.

<dependencies>
    <dependency>
        <groupId>org.junit.jupiter</groupId>
        <artifactId>junit-jupiter-api</artifactId>
        <version>5.6.2</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.13</version>
        <scope>test</scope>
    </dependency>
</dependencies>

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Answer