wagon-provider-api/src/test/java/org/apache/maven/wagon/manager/DefaultWagonManagerTest.xml

<plexus>
  <components>
    <component>
      <role>org.apache.maven.wagon.Wagon</role>
      <role-hint>a</role-hint>
      <implementation>org.apache.maven.wagon.manager.WagonA</implementation>
    </component>
    <component>
      <role>org.apache.maven.wagon.Wagon</role>
      <role-hint>b1</role-hint>
      <implementation>org.apache.maven.wagon.manager.WagonB</implementation>
    </component>
     <component>
        <role>org.apache.maven.wagon.Wagon</role>
        <role-hint>b2</role-hint>
        <implementation>org.apache.maven.wagon.manager.WagonB</implementation>
      </component>
    <component>
      <role>org.apache.maven.wagon.Wagon</role>
      <role-hint>c</role-hint>
      <implementation>org.apache.maven.wagon.manager.WagonC</implementation>
    </component>
  </components>
</plexus>