core-integration-testing/core-integration-tests/src/test/resources/it0031/settings.xml

<settings>
  <pluginGroups>
    <pluginGroup>org.codehaus.modello</pluginGroup>
  </pluginGroups>
  <mirrors>
   <mirror>
      <id>test</id>
      <name>Test Mirror of ibiblio.org</name>
      <url>http://test.maven.codehaus.org/maven2</url>
      <mirrorOf>central</mirrorOf>
    </mirror>
   <mirror>
      <id>test-plugins</id>
      <name>Test Mirror of ibiblio.org Plugin Repository</name>
      <url>http://test.maven.codehaus.org/maven2/plugins</url>
      <mirrorOf>central-plugins</mirrorOf>
    </mirror>
  </mirrors>
</settings>