Set<DependencyScope> dependencyScopes();

    PathScope MAIN_COMPILE = pathScope(
            "main-compile",
            ProjectScope.MAIN,
            DependencyScope.COMPILE_ONLY,
            DependencyScope.COMPILE,
            DependencyScope.PROVIDED);

    PathScope MAIN_RUNTIME =
            pathScope("main-runtime", ProjectScope.MAIN, DependencyScope.COMPILE, DependencyScope.RUNTIME);

    PathScope TEST_COMPILE = pathScope(

     * will default to {@link #COMPILE}.
     */
    UNDEFINED("", false),

    /**
     * Compile only.
     */
    COMPILE_ONLY("compile-only", false),

    /**
     * Compile, runtime and test.
     */
    COMPILE("compile", true),

    /**
     * Runtime and test.
     */
    RUNTIME("runtime", true),

    /**

        }
        stringBuilder
                .append(":")
                .append(dependency.getVersion())
                .append("@")
                .append(dependency.getScope() == null ? "compile" : dependency.getScope());
        if (dependency.isOptional()) {
            stringBuilder.append("[optional]");
        }
        if (!dependency.getExclusions().isEmpty()) {

        pd.setVersion("1");

        DefaultArtifact artifact = new DefaultArtifact(
                pd.getGroupId(),
                pd.getArtifactId(),
                pd.getVersion(),
                "compile",
                "maven-plugin",
                "",
                new DefaultArtifactHandler("maven-plugin"));
        pd.setPluginArtifact(artifact);

    @Test
    void testCompileResolution() throws Exception {
        MetadataGraph res;

        res = resolver.resolveConflicts(graph, ArtifactScopeEnum.compile);

        assertNotNull(res, "null graph after resolver");
        assertNotNull(res.getVertices(), "no vertices in the resulting graph after resolver");

        assertNotNull( artifact, "dependency artifact not found in map." );
        assertEquals( Artifact.SCOPE_COMPILE, artifact.getScope(), "dependency artifact has wrong scope." );

        //check for back-propagation of default scope.
        assertEquals( Artifact.SCOPE_COMPILE, dep.getScope(), "default scope NOT back-propagated to dependency." );
        */
    }

    @Test
    @Disabled

    <p>The <a href="/plugins/maven-toolchains-plugin/">toolchains-plugin</a> can read available toolchains on the user's computer
    and match them against the toolchain requirements of the project (as configured in {@code pom.xml}):
    if match is found, the toolchain instance is made available to other Maven plugins.</p>

        dependency.setGroupId(groupId);
        dependency.setArtifactId(artifactId);
        dependency.setVersion(version);
        dependency.setType("jar");
        dependency.setScope("compile");

        return factory.createDependencyArtifact(dependency);
    }

    private MojoExecution newMojoExecution() {
        PluginDescriptor pd = new PluginDescriptor();

                                                     exclusion );

        Set<Artifact> artifactDependencies =
            resolver.resolve( project, Collections.singleton( Artifact.SCOPE_COMPILE ), session );
        assertEquals( 0, artifactDependencies.size() );

        artifactDependencies = resolver.resolve( project, Collections.singleton( Artifact.SCOPE_RUNTIME ), session );

        @Inject
        public DefaultPathScopeRegistry(List<PathScopeProvider> providers) {
            super(
                    providers,
                    PathScope.MAIN_COMPILE,
                    PathScope.MAIN_RUNTIME,
                    PathScope.TEST_COMPILE,
                    PathScope.TEST_RUNTIME);
        }
    }

    @Named
    @SessionScoped
    public static class DefaultProjectScopeRegistry