Sharing src/test classes between modules in a multi-module maven project

gistfile1.txt

Add in base module pom (under dependencies for example):

<build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <version>3.1.2</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>testutil-jar</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
    
Add dependency in child module:
<dependency>
            <groupId>com.example</groupId>
            <artifactId>submodule</artifactId>
            <version>1.0</version>
            <type>testutil-jar</type>
            <scope>test</scope>
        </dependency>