exclusion.setArtifactId("maven-core");
        ExclusionArtifactFilter filter = new ExclusionArtifactFilter(Collections.singletonList(exclusion));

        assertThat(filter.include(artifact), is(false));
    }

    @Test
    void testExcludeGroupIdWildcardNoMatch() {
        Exclusion exclusion = new Exclusion();
        exclusion.setGroupId("*");
        exclusion.setArtifactId("maven-compat");

    }

    @Test
    void testResolveParentThrowsUnresolvableModelExceptionWhenNotFound() throws Exception {
        final Parent parent = new Parent();
        parent.setGroupId("org.apache");
        parent.setArtifactId("apache");
        parent.setVersion("0");

        UnresolvableModelException e = assertThrows(
                UnresolvableModelException.class,

                null,
                new DefaultArtifactHandler("ignore"));
        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(errors.isEmpty());
    }

        /*
        Dependency dep1 = new Dependency();
        dep1.setGroupId( "test" );
        dep1.setArtifactId( "test-artifact" );
        dep1.setVersion( "1" );
        dep1.setType( "jar" );

        Exclusion exc = new Exclusion();
        exc.setGroupId( "test" );
        exc.setArtifactId( "test-artifact3" );

        dep1.addExclusion( exc );

        Dependency dep2 = new Dependency();

        mojoDescriptor.setGoal("goal");
        PluginDescriptor pluginDescriptor = new PluginDescriptor();
        pluginDescriptor.setGoalPrefix("goalPrefix");
        pluginDescriptor.setArtifactId("artifactId");
        mojoDescriptor.setPluginDescriptor(pluginDescriptor);

        Parameter parameter = new Parameter();
        parameter.setType("java.lang.String[]");
        parameter.setName("toAddresses");

     * @param session The Maven session to use, must not be {@code null}.
     */
    public DefaultPluginVersionRequest(Plugin plugin, MavenSession session) {
        setGroupId(plugin.getGroupId());
        setArtifactId(plugin.getArtifactId());

        setRepositorySession(session.getRepositorySession());

        MavenProject project = session.getCurrentProject();
        if (project != null) {

        result.setGroupId("org.apache");
        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());

    public static final MavenProject UNKNOWN = new MavenProject();

    static {
        A.setArtifactId("A");
        B.setArtifactId("B");
        C.setArtifactId("C");
        X.setArtifactId("X");
        Y.setArtifactId("Y");
        Z.setArtifactId("Z");
    }

    // This should probably be moved to a separate stub

        Parent parent = new Parent();

        parent.setGroupId("test-group");
        parent.setVersion("1000");
        parent.setArtifactId("test-artifact");

        Model model = new Model();

        model.setParent(parent);
        model.setArtifactId("real-artifact");

        MavenProject project = new MavenProject(model);

        */
    }
    // ------------------------------------------------------------------
    //    public void init( ArtifactMetadata af )
    //    {
    //        setGroupId( af.getGroupId() );
    //        setArtifactId( af.getArtifactId() );
    //        setVersion( af.getVersion() );
    //        setType( af.getType() );
    //        setScope( af.getScope() );
    //        setClassifier( af.getClassifier() );