return groupId + ":" + artifactId;
    }

    public static String key(Artifact artifact) {
        return key(artifact.getGroupId(), artifact.getArtifactId(), artifact.getVersion());
    }

    public static String key(String groupId, String artifactId, String version) {
        notBlank(groupId, "groupId can neither be null, empty nor blank");

     * @return the key of the plugin, ie {@code groupId:artifactId}
     */
    public String getKey() {
        return constructKey(getGroupId(), getArtifactId());
    }

    /**
     * @param groupId the group ID of the plugin in the repository
     * @param artifactId the artifact ID of the reporting plugin in the repository
     * @return the key of the plugin, ie {@code groupId:artifactId}
     */

     */
    @Nonnull
    ArtifactCoordinate createArtifactCoordinate(String groupId, String artifactId, String version, String extension);

    /**
     * Shortcut for {@code getService(ArtifactFactory.class).create(...)}.
     *
     * @param groupId the group identifier, or {@code null} is unspecified
     * @param artifactId the artifact identifier, or {@code null} is unspecified

  <modelVersion>4.0.0</modelVersion>

  <!-- Shared parent. Doesn't define a lot of things about Apache like general mailing lists, but does
       define the settings common to all projects at Apache -->
  <groupId>org.apache</groupId>
  <artifactId>apache</artifactId>
  <version>3</version>
  <packaging>pom</packaging>
  <name>The Apache Software Foundation</name>
  <description>

    }

    public void setGroupId(String groupId) {
        getModel().setGroupId(groupId);
    }

    public String getGroupId() {
        String groupId = getModel().getGroupId();

        if ((groupId == null) && (getModel().getParent() != null)) {
            groupId = getModel().getParent().getGroupId();
        }

        return groupId;
    }

    /**
     * Gets the list of group ids to scan for the plugin prefix.
     *
     * @return The list of group ids to scan for the plugin prefix, never {@code null}.
     */
    List<String> getPluginGroups();

    /**
     * Sets the list of group ids to scan for the plugin prefix.
     *
     * @param pluginGroups The list of group ids to scan for the plugin prefix, may be {@code null}.

        <groupId>org.apache.maven</groupId>
        <artifactId>maven-profile</artifactId>
        <version>${project.version}</version>
      </dependency>
      <dependency>
        <groupId>org.apache.maven</groupId>
        <artifactId>maven-model</artifactId>
        <version>${project.version}</version>
      </dependency>
      <dependency>
        <groupId>org.apache.maven</groupId>

        public ArtifactFactoryRequestBuilder session(Session session) {
            this.session = session;
            return this;
        }

        public ArtifactFactoryRequestBuilder groupId(String groupId) {
            this.groupId = groupId;
            return this;
        }

        public ArtifactFactoryRequestBuilder artifactId(String artifactId) {
            this.artifactId = artifactId;
            return this;

  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>org.codehaus.plexus</groupId>
    <artifactId>plexus</artifactId>
    <version>1.0.9</version>
  </parent>
  <groupId>org.codehaus.plexus</groupId>
  <artifactId>plexus-containers</artifactId>
  <packaging>pom</packaging>
  <name>Parent Plexus Container POM</name>

 *
 */
@PlexusTest
@Deprecated
public abstract class AbstractConflictResolverTest {
    // constants --------------------------------------------------------------

    private static final String GROUP_ID = "test";

    // fields -----------------------------------------------------------------

    protected Artifact a1;

    protected Artifact a2;

    protected Artifact b1;