src/test/resources/unit/pom-only/pom.xml

<project>
  <modelVersion>4.0.0</modelVersion>
  <groupId>def.configuration</groupId>
  <artifactId>pom-only</artifactId>
  <version>1.0-SNAPSHOT</version>
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-repository-plugin</artifactId>
        <configuration>
          <project implementation="org.apache.maven.plugins.repository.stubs.PomOnlyMavenProjectStub"/>
          <outputDirectory>${basedir}/target/test/unit/pom-only/target</outputDirectory>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>