final Parent parent = new Parent();
        parent.setGroupId("org.apache");
        parent.setArtifactId("apache");
        parent.setVersion("1");

        assertNotNull(this.newModelResolver().resolveModel(parent));
        assertEquals("1", parent.getVersion());
    }

    @Test
    void testResolveParentSuccessfullyResolvesExistingParentUsingHighestVersion() throws Exception {

            if (plugin.getVersion() == null) {
                PluginVersionRequest request = new DefaultPluginVersionRequest(
                        plugin, session.getRepositorySession(), project.getRemotePluginRepositories());
                plugin.setVersion(pluginVersionResolver.resolve(request).getVersion());
            }
            versions.put(plugin.getKey(), plugin.getVersion());
        }

        final Parent parent = new Parent();
        parent.setGroupId("ut.simple");
        parent.setArtifactId("artifact");
        parent.setVersion("1.0");

        assertNotNull(this.newModelResolver().resolveModel(parent));
        assertEquals("1.0", parent.getVersion());
    }

    @Test
    void testResolveParentSuccessfullyResolvesExistingParentUsingHighestVersion() throws Exception {

        model.setArtifactId("test-artifact");
        model.setVersion("1.0.0");

        Build build = new Build();
        model.setBuild(build);

        // Add a test plugin
        Plugin originalPlugin = new Plugin();
        originalPlugin.setGroupId("org.apache.maven.plugins");
        originalPlugin.setArtifactId("maven-compiler-plugin");
        originalPlugin.setVersion("3.8.1");
        build.addPlugin(originalPlugin);

                    Dependency dependency = new Dependency();
                    dependency.setArtifactId(moduleTo);
                    dependency.setGroupId(project.getGroupId());
                    dependency.setVersion(project.getVersion());

                    project.getModel().addDependency(dependency);
                }
            }
        }
    }

    @Override
    protected String getProjectsDirectory() {

        PluginDescriptor descriptor = new PluginDescriptor();
        descriptor.setGroupId("org.apache.maven.its.plugins");
        descriptor.setArtifactId("maven-it-plugin");
        descriptor.setVersion("0.1");
        List<String> errors = new ArrayList<>();
        mavenPluginValidator.validate(plugin, descriptor, errors);
        assertTrue(

        MavenSession session = createMavenSession(null);
        Plugin plugin = new Plugin();
        plugin.setGroupId("org.apache.maven.its.plugins");
        plugin.setArtifactId("maven-it-plugin");
        plugin.setVersion("0.1");
        PluginDescriptor pluginDescriptor = pluginManager.loadPlugin(
                plugin, session.getCurrentProject().getRemotePluginRepositories(), session.getRepositorySession());

    } // -- void setGroupId( String )

    /**
     * Set the version of the extension.
     *
     * @param version a version object.
     */
    public void setVersion(String version) {
        this.version = version;
    } // -- void setVersion( String )

    /**
     * Gets the identifier of the extension.
     *

            SnapshotVersion sv = new SnapshotVersion();
            sv.setClassifier(artifact.getClassifier());
            sv.setExtension(artifact.getExtension());
            sv.setVersion(getVersion());
            sv.setUpdated(lastUpdated);
            versions.put(getKey(sv.getClassifier(), sv.getExtension()), sv);
        }

        Versioning versioning = recessive.getVersioning();

        CoreExtension oldExtension = new CoreExtension();
        oldExtension.setGroupId(extension.getGroupId());
        oldExtension.setArtifactId(extension.getArtifactId());
        oldExtension.setVersion(extension.getVersion());
        if (extension.getClassLoadingStrategy() != null) {
            oldExtension.setClassLoadingStrategy(extension.getClassLoadingStrategy());
        }
        this.extension = oldExtension;
    }