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 {

        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);

        extension.setArtifactId(artifactId);
        extension.setVersion(version);
        return extension;
    }

    private static MavenProject createProject(String groupId, String artifactId, String version) {
        Model model = new Model();
        model.setGroupId(groupId);
        model.setArtifactId(artifactId);
        model.setVersion(version);
        model.setBuild(new Build());

                                : currentData.getRawModel().getGroupId());

                currentData.setVersion(
                        currentData.getRawModel().getVersion() == null
                                ? parentData.getVersion()
                                : currentData.getRawModel().getVersion());

                currentData.setArtifactId(currentData.getRawModel().getArtifactId());

        assertEquals(expected, actual);
    }

    @Test
    void testEscapedVariablePassthrough() throws Exception {
        String var = "${var}";

        Model model = new Model();
        model.setVersion("1");

        MavenProject project = new MavenProject(model);

        ExpressionEvaluator ee = createExpressionEvaluator(project, null, new Properties());

        Object value = ee.evaluate("$" + var);

        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(

        public ProjectBuilder setArtifactId(String artifactId) {
            project.setArtifactId(artifactId);
            return this;
        }

        public ProjectBuilder setVersion(String version) {
            project.setVersion(version);
            return this;
        }

        // Dependencies
        //

        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.
     *

        result.setArtifactId("A");
        result.setVersion("1.2");
        return result;
    }

    static Dependency toDependency(MavenProject mavenProject) {
        final Dependency dependency = new Dependency();
        dependency.setArtifactId(mavenProject.getArtifactId());
        dependency.setGroupId(mavenProject.getGroupId());
        dependency.setVersion(mavenProject.getVersion());
        return dependency;
    }