Model parent = Model.newBuilder().artifactId("PARENT").build();
        Model model = Model.newInstance();
        Model.Builder builder = Model.newBuilder(model);
        modelMerger.mergeModel_ArtifactId(builder, model, parent, false, null);
        assertNull(model.getArtifactId());

        model = Model.newBuilder().artifactId("MODEL").build();
        builder = Model.newBuilder(model);

  }

  GraphBuilder<N> copy() {
    GraphBuilder<N> newBuilder = new GraphBuilder<>(directed);
    newBuilder.allowsSelfLoops = allowsSelfLoops;
    newBuilder.nodeOrder = nodeOrder;
    newBuilder.expectedNodeCount = expectedNodeCount;
    newBuilder.incidentEdgeOrder = incidentEdgeOrder;
    return newBuilder;
  }

  @SuppressWarnings("unchecked")

  }

  ValueGraphBuilder<N, V> copy() {
    ValueGraphBuilder<N, V> newBuilder = new ValueGraphBuilder<>(directed);
    newBuilder.allowsSelfLoops = allowsSelfLoops;
    newBuilder.nodeOrder = nodeOrder;
    newBuilder.expectedNodeCount = expectedNodeCount;
    newBuilder.incidentEdgeOrder = incidentEdgeOrder;
    return newBuilder;
  }

  @SuppressWarnings("unchecked")

  @Override
  protected void setUp() {
    listener = queuingRemovalListener();
  }

  public void testGet() {
    Object computed = new Object();
    LoadingCache<Object, Object> cache =
        CacheBuilder.newBuilder()
            .maximumSize(0)
            .removalListener(listener)
            .build(constantLoader(computed));

    Object key = new Object();
    assertSame(computed, cache.getUnchecked(key));

    }

    @Test
    void testResolveParentThrowsModelResolverExceptionWhenNotFound() throws Exception {
        final Parent parent = Parent.newBuilder()
                .groupId("org.apache")
                .artifactId("apache")
                .version("0")
                .build();

        ModelResolverException e = assertThrows(

class SettingsUtilsTest {

    @Test
    void testShouldAppendRecessivePluginGroupIds() {
        Settings dominant = Settings.newBuilder()
                .pluginGroups(Arrays.asList("org.apache.maven.plugins", "org.codehaus.modello"))
                .build();

        Settings recessive = Settings.newBuilder()
                .pluginGroups(Arrays.asList("org.codehaus.plexus"))
                .build();

  @Override
  protected void setUp() {
    listener = queuingRemovalListener();
  }

  public void testGet() {
    Object computed = new Object();
    LoadingCache<Object, Object> cache =
        CacheBuilder.newBuilder()
            .maximumSize(0)
            .removalListener(listener)
            .build(constantLoader(computed));

    Object key = new Object();
    assertSame(computed, cache.getUnchecked(key));

    }

    private static Metadata createMetadata(Artifact artifact) {
        Snapshot snapshot = Snapshot.newBuilder().localCopy(true).build();
        Versioning versioning = Versioning.newBuilder().snapshot(snapshot).build();
        Metadata metadata = Metadata.newBuilder()
                .versioning(versioning)
                .groupId(artifact.getGroupId())
                .artifactId(artifact.getArtifactId())

        Model.Builder builder = Model.newBuilder(model);

        builder.dependencies(injectList(model.getDependencies(), this::injectDependency));
        Build build = model.getBuild();
        if (build != null) {
            Build newBuild = Build.newBuilder(build)
                    .plugins(injectList(build.getPlugins(), this::injectPlugin))

  }

  public void testConcurrencyLevel_Zero() {
    Interners.InternerBuilder builder = Interners.newBuilder();
    assertThrows(IllegalArgumentException.class, () -> builder.concurrencyLevel(0));
  }

  public void testConcurrencyLevel_Negative() {
    Interners.InternerBuilder builder = Interners.newBuilder();
    assertThrows(IllegalArgumentException.class, () -> builder.concurrencyLevel(-42));
  }