*/
  @Test
  public abstract void incidentEdges_checkReturnedSetMutability();

  @Test
  public void nodes_oneNode() {
    addNode(N1);
    assertThat(graph.nodes()).containsExactly(N1);
  }

  @Test
  public void nodes_noNodes() {
    assertThat(graph.nodes()).isEmpty();
  }

  @Test
  public void adjacentNodes_oneEdge() {
    putEdge(N1, N2);

  static final Funnel<Object> BAD_FUNNEL =
      new Funnel<Object>() {
        @Override
        public void funnel(Object object, PrimitiveSink bytePrimitiveSink) {
          bytePrimitiveSink.putInt(object.hashCode());
        }
      };

  enum RandomHasherAction {
    PUT_BOOLEAN() {
      @Override
      void performAction(Random random, Iterable<? extends PrimitiveSink> sinks) {
        boolean value = random.nextBoolean();

     * @param error the associated exception, or null if not applicable
     */
    void log(@Nonnull Level level, @Nonnull String message, @Nullable Throwable error);

    /**
     * Logs a debug message without an associated exception.
     *
     * @param message the debug message to be logged
     */
    default void debug(String message) {
        log(Level.DEBUG, message);
    }

    /**

     */
    public void setFileComment(String fileComment) {
        this.fileComment = fileComment;
    } // -- void setFileComment( String )

    /**
     * Method write.
     *
     * @param writer a writer object.
     * @param coreExtensions a coreExtensions object.
     * @throws IOException IOException if any.
     */

    @BeforeEach
    void setUp() {
        converterLookup = new DefaultConverterLookup();
        evaluator = mock(ExpressionEvaluator.class);
        listener = mock(ConfigurationListener.class);
        helper = new EnhancedCompositeBeanHelper(converterLookup, getClass().getClassLoader(), evaluator, listener);
    }

    @AfterEach
    void tearDown() {
        EnhancedCompositeBeanHelper.clearCaches();

        assertNull(model.getBuild());
    }

    @Test
    void testEqualsNullSafe() {
        assertNotEquals(null, new Model());

        new Model().equals(new Model());
    }

    @Test
    void testEqualsIdentity() {
        Model thing = new Model();
        assertEquals(thing, thing);
    }

    @Test
    void testToStringNullSafe() {
        assertNotNull(new Model().toString());
    }

@DisplayName("GAVUtils")
class GAVUtilsTest {

    @BeforeEach
    void setUp() {}

    private UpgradeContext createMockContext() {
        return TestUtils.createMockContext();
    }

    @Nested
    @DisplayName("Artifact Extraction")
    class GAVExtractionTests {

        @Test
        @DisplayName("should extract Artifact from complete POM")
        void shouldExtractGAVFromCompletePOM() throws Exception {

    @BeforeEach
    void setUp() {
        // Save original system property
        originalSystemProperty = System.getProperty(Constants.MAVEN_LOGGER_DEFAULT_LOG_LEVEL);
        // Clear system property to test configuration file loading
        System.clearProperty(Constants.MAVEN_LOGGER_DEFAULT_LOG_LEVEL);
    }

    @AfterEach
    void tearDown() {
        // Restore original system property

     */
    protected void setupGuiceClassLoading(C context) {
        if (System.getProperty("guice_custom_class_loading", "").isBlank()) {
            System.setProperty("guice_custom_class_loading", "CHILD");
        }
    }

    protected void configureLogging(C context) throws Exception {
        // LOG COLOR

        return artifact;
    }

    protected void createLocalArtifact(Artifact artifact) throws Exception {
        createArtifact(artifact, localRepository());
    }

    protected void createRemoteArtifact(Artifact artifact) throws Exception {
        createArtifact(artifact, remoteRepository());
    }

    protected void createArtifact(Artifact artifact, ArtifactRepository repository) throws Exception {