src/test/resources/unit/compiler-basic-test/plugin-config.xml

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<project>
  <build>
    <plugins>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <configuration>
          <compileSourceRoots>
            <compileSourceRoot>${basedir}/target/test-classes/unit/compiler-basic-test/src/main/java</compileSourceRoot>
          </compileSourceRoots>
          <compilerId>javac</compilerId>
          <debug>true</debug>
          <outputDirectory>${basedir}/target/test/unit/compiler-basic-test/target/classes</outputDirectory>
          <buildDirectory>${basedir}/target/test/unit/compiler-basic-test/target</buildDirectory>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>