like to get an error. Currently we do, but if we add the extra <inherits> lines, we
            won't.

            I have one idea for a better approach, but it's painful, and I haven't tested it: We
            could postprocess Collect.gwt.xml to add <skip> lines for all the files that should be
            covered by testModule.gwt.xml. Maybe I'll try it someday.

    <plugins>
      <plugin>
        <artifactId>my-plugin</artifactId>
        <configuration>
          <testOne>${project.groupId}</testOne>
          <testTwo>${pom.groupId}</testTwo>
          <testThree>${groupId}</testThree>
        </configuration>
      </plugin>
    </plugins>
  </build>

          <description>
            This element specifies a directory containing the unit test source of the
            project. The generated build system will compile these directories when the project is
            being tested. The path given is relative to the project descriptor.
            The default value is {@code src/test/java}.
          </description>
          <type>String</type>
        </field>
        <field>

      </activation>
      <properties>
        <!--
            Some tests need reflective access to the internals of these packages. It is only the
            tests themselves and not the code being tested that needs that access, though there's no
            obvious way to ensure that.

            We could consider arranging things so that only the tests we know need this would get