public ModelSource resolveModel(String groupId, String artifactId, String version)
            throws UnresolvableModelException {
        File pomFile = null;

        if (modelPool != null) {
            pomFile = modelPool.get(groupId, artifactId, version);
        }

        if (pomFile == null) {
            Artifact pomArtifact = new DefaultArtifact(groupId, artifactId, "", "pom", version);

            try {

    }

    protected File projectFile(String name) {
        return projectFile("maven", name);
    }

    protected File projectFile(String groupId, String artifactId) {
        return new File(getLocalRepositoryPath(), "/" + groupId + "/poms/" + artifactId + "-1.0.pom");
    }

    // ----------------------------------------------------------------------
    // The local repository for this category of tests

     */
    @Nonnull
    ArtifactCoordinates createArtifactCoordinates(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

            ModelBuildingRequest request) {
        // We only check for groupId/artifactId/version/classifier cause if there is another
        // module with the same groupId/artifactId/version/classifier this will fail the build
        // earlier like "Project '...' is duplicated in the reactor.
        // So it is sufficient to check only groupId/artifactId/version/classifier and not the
        // packaging type.

        Xpp3Dom dom = new Xpp3Dom("reportPlugin", plugin.getLocation(""));

        addDom(dom, "groupId", plugin.getGroupId(), plugin.getLocation("groupId"));
        addDom(dom, "artifactId", plugin.getArtifactId(), plugin.getLocation("artifactId"));
        addDom(dom, "version", plugin.getVersion(), plugin.getLocation("version"));

        Xpp3Dom configuration = (Xpp3Dom) plugin.getConfiguration();
        if (configuration != null) {

        String artifactId = plugin.childText(MavenPomElements.Elements.ARTIFACT_ID);

        // Default groupId for Maven plugins
        if (groupId == null && artifactId != null && artifactId.startsWith(MAVEN_PLUGIN_PREFIX)) {
            groupId = DEFAULT_MAVEN_PLUGIN_GROUP_ID;
        }

        return (groupId != null && artifactId != null) ? groupId + ":" + artifactId : null;
    }

  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>inheritance</groupId>
  <artifactId>parent</artifactId>
  <version>11-SNAPSHOT</version>

  <name>Model urls inheritance test parent</name>

  child.project.url.inherit.append.path="false">
  <modelVersion>4.0.0</modelVersion>

  <groupId>inheritance</groupId>
  <artifactId>parent</artifactId>
  <version>11-SNAPSHOT</version>

  <name>Model urls inheritance test parent, with special merge test for mergeSite_ChildSiteUrlInheritAppendPath</name>

  <scm child.scm.connection.inherit.append.path="false"

        System.out.println("Result: " + result);

        assertSame(
                exec.getMojoDescriptor().getPluginDescriptor().getArtifactId(),
                result,
                "${plugin.artifactId} expression does not return plugin descriptor's artifactId.");
    }

    @Test

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<project>
  <modelVersion>99.0.0</modelVersion>
  <groupId>foo</groupId>
  <artifactId>bar</artifactId>
  <version>0.1</version>