// v1-->v2
        graph.addEdge(v1, v2, new MetadataGraphEdge("1.1", true, null, null, 2, 1));
        graph.addEdge(v1, v2, new MetadataGraphEdge("1.2", true, null, null, 2, 2));

        // v1-->v3
        graph.addEdge(v1, v3, new MetadataGraphEdge("1.1", true, null, null, 2, 1));
        graph.addEdge(v1, v3, new MetadataGraphEdge("1.2", true, null, null, 4, 2));

        // v3-->v4

        requireNonNull(source, "source is null");
        try {
            Path tempPath = null;
            try {
                tempPath = Files.createTempFile("transport-get", "tmp");
                Files.write(tempPath, source);
                put(tempPath, relativeTarget);
            } finally {
                if (tempPath != null) {
                    Files.deleteIfExists(tempPath);

                        Set<Binding<Object>> res3 = res2 != null ? new HashSet<>(res2) : new HashSet<>();
                        Map<String, Supplier<Object>> map = res3.stream()
                                .filter(b -> b.getOriginalKey() == null
                                        || b.getOriginalKey().getQualifier() == null
                                        || b.getOriginalKey().getQualifier() instanceof String)

          ToOptionalState::new,
          (state, o) -> state.add((o == null) ? NULL_PLACEHOLDER : o),
          ToOptionalState::combine,
          state -> {
            Object result = state.getElement();
            return (result == NULL_PLACEHOLDER) ? null : result;
          },
          Collector.Characteristics.UNORDERED);

  /**

    @BeforeEach
    void setUp() throws Exception {
        policy = new DefaultGraphConflictResolutionPolicy();
        e1 = new MetadataGraphEdge("1.1", true, null, null, 2, 1);
        e2 = new MetadataGraphEdge("1.2", true, null, null, 3, 2);
        e3 = new MetadataGraphEdge("1.2", true, null, null, 2, 3);
    }

    // ------------------------------------------------------------------------------------------
    @Test

    var tcpConnectDelayNanos = 0L
    var tcpConnectThrowable: Throwable? = null
    var yieldBeforeTcpConnectReturns = false
    var connectTcpNextPlan: FakePlan? = null
    var tlsConnectDelayNanos = 0L
    var tlsConnectThrowable: Throwable? = null
    var connectTlsNextPlan: FakePlan? = null

    fun createRetry(): FakePlan {
      check(retry == null)
      return FakePlan(nextPlanId++)
        .also {
          retry = it

    uriPort: Int = this.uriPort,
    proxy: Proxy? = null,
    proxySelector: ProxySelector = this.proxySelector,
  ): Address {
    return Address(
      uriHost = uriHost,
      uriPort = uriPort,
      dns = dns,
      socketFactory = SocketFactory.getDefault(),
      sslSocketFactory = null,
      hostnameVerifier = null,
      certificatePinner = null,
      proxyAuthenticator = proxyAuthenticator,

     *
     * @param session The session to use to resolve the model, must not be {@code null}.
     * @param parent The parent coordinates to resolve, must not be {@code null}.
     * @param modified a holder for the updated parent, must not be {@code null}.
     * @return The source of the requested POM, never {@code null}.
     * @throws ModelResolverException If the POM could not be resolved from any configured repository.
     */

                    .flatMap(this::getProjectArtifacts)
                    .filter(a -> Objects.equals(id, id(a)))
                    .forEach(a -> a.setFile(path != null ? path.toFile() : null));
        }
        if (path == null) {
            paths.remove(id);
        } else {
            paths.put(id, path);
        }
    }

    /**
     * Retrieve a stream of the project's artifacts.

    @Override
    public File getFile() {
        return path != null ? path.toFile() : null;
    }

    @Override
    public Path getPath() {
        return path;
    }

    @Deprecated
    public void merge(File existing, File result) throws RepositoryException {
        merge(existing != null ? existing.toPath() : null, result != null ? result.toPath() : null);
    }

    @Override