assertEquals(2, a.getChildren().size());
        assertTrue(a.getChildren().contains(b));
        assertTrue(a.getChildren().contains(d));
        assertEquals(2, d.getParents().size());
        assertTrue(d.getParents().contains(a));
        assertTrue(d.getParents().contains(c));
    }

    @Test
    public void testCycleDetection() throws Exception {
        Graph graph1 = new Graph();
        addEdge(graph1, "a", "b");

                        Files.createDirectories(path.getParent());
                        Files.copy(zis, path, StandardCopyOption.REPLACE_EXISTING);
                    } else if ("css".equals(names[0])) {
                        names[0] = themeName;
                        final Path path = ResourceUtil.getCssPath(names);
                        Files.createDirectories(path.getParent());

        assertEquals("123.123.123.123:9999", ftpInfo.getCacheKey());
        assertEquals("123.123.123.123", ftpInfo.getHost());
        assertEquals(9999, ftpInfo.getPort());
        assertEquals("/", ftpInfo.getParent());
        assertNull(ftpInfo.getName());

        value = "ftp://123.123.123.123/test.txt";
        ftpInfo = new FtpClient.FtpInfo(value, Constants.UTF_8);
        assertEquals(value, ftpInfo.toUrl());

        assertEquals("1", childProject.getParentArtifact().getVersion());
        assertNotNull(childProject.getParent());
        assertEquals("1", childProject.getParent().getVersion());
        assertNotNull(childProject.getModel().getParent());
        assertEquals("[1,10]", childProject.getModel().getParent().getVersion());
    }

    /**
     * Tests whether local version range parent references are built correctly.

                File remoteFile = new File(basedir, path(download.getArtifact()));
                try {
                    Path dest = download.getPath();
                    Files.createDirectories(dest.getParent());
                    Files.copy(remoteFile.toPath(), dest);
                } catch (IOException e) {
                    if (!remoteFile.exists()) {

        // raw to consumer transform
        model = model.withRoot(false).withModules(null).withSubprojects(null);
        if (model.getParent() != null) {
            model = model.withParent(model.getParent().withRelativePath(null));
        }

        if (!preserveModelVersion) {
            model = model.withPreserveModelVersion(false);

                    }
                }
                try {
                    Files.delete(artifactPath);
                    Files.delete(artifactPath.getParent());
                    Files.delete(artifactPath.getParent().getParent());
                } catch (DirectoryNotEmptyException e) {
                    // ignore
                }
            }
        } catch (IOException e) {

        public ModelSource resolve(@Nonnull ModelLocator locator, @Nonnull String relative) {
            String norm = relative.replace('\\', File.separatorChar).replace('/', File.separatorChar);
            Path path = getPath().getParent().resolve(norm);
            Path relatedPom = locator.locateExistingPom(path);
            if (relatedPom != null) {
                return new BuildPathSource(relatedPom);
            }
            return null;

            Path parent = pomPath.getParent();
            if (parent == null) {
                parent = Path.of(".");
            }
            if (commonRoot == null) {
                commonRoot = parent;
            } else {
                // Find common ancestor
                while (!parent.startsWith(commonRoot)) {
                    commonRoot = commonRoot.getParent();
                    if (commonRoot == null) {

        if (groupId == null && model.getParent() != null) {
            groupId = model.getParent().getGroupId();
        }
        return groupId;
    }

    static String getVersion(Model model) {
        String version = model.getVersion();
        if (version == null && model.getParent() != null) {
            version = model.getParent().getVersion();
        }
        return version;