void testDependencyManagementExclusionsExcludeTransitively() throws Exception {
        File localRepo = getLocalRepositoryPath();

        File pom0 = new File(localRepo, "p0/pom.xml");
        File pom0Basedir = pom0.getParentFile();
        File pom1 = new File(pom0Basedir, "p1/pom.xml");

        // load the child project, which inherits from p0...
        MavenProject project0 = getProjectWithDependencies(pom0);

        File pom0 = new File(localRepo, "p0/pom.xml");
        File pom1 = new File(pom0.getParentFile(), "p1/pom.xml");
        File pom2 = new File(pom1.getParentFile(), "p2/pom.xml");
        File pom3 = new File(pom2.getParentFile(), "p3/pom.xml");
        File pom4 = new File(pom3.getParentFile(), "p4/pom.xml");
        File pom5 = new File(pom4.getParentFile(), "p5/pom.xml");

    File file = root();
    assertNull(file.getParentFile());
    assertNull(file.getCanonicalFile().getParentFile());
    Files.createParentDirs(file);
  }

  public void testCreateParentDirs_relativePath() throws IOException {
    File file = file("nonexistent.file");
    assertNull(file.getParentFile());
    assertNotNull(file.getCanonicalFile().getParentFile());
    Files.createParentDirs(file);
  }

    File file = root();
    assertNull(file.getParentFile());
    assertNull(file.getCanonicalFile().getParentFile());
    Files.createParentDirs(file);
  }

  public void testCreateParentDirs_relativePath() throws IOException {
    File file = file("nonexistent.file");
    assertNull(file.getParentFile());
    assertNotNull(file.getCanonicalFile().getParentFile());
    Files.createParentDirs(file);
  }

    @Test
    void testDependencyManagement() throws Exception {
        File localRepo = getLocalRepositoryPath();
        File pom0 = new File(localRepo, "p0/pom.xml");

        File pom0Basedir = pom0.getParentFile();

        File pom1 = new File(pom0Basedir, "p1/pom.xml");

        // load everything...
        MavenProject project1 = getProjectWithDependencies(pom1);

    }

    public File createFile(File dir, String filename, String contents, String encoding) throws IOException {
        File file = new File(dir, filename);

        file.getParentFile().mkdirs();

        FileUtils.fileWrite(file.getPath(), encoding, contents);

        markForDeletion(file);

        return file;
    }

        a.setFile(file);

        File touchFile = updateCheckManager.getTouchfile(a);
        touchFile.delete();

        assertTrue(updateCheckManager.isUpdateRequired(a, remoteRepository));

        file.getParentFile().mkdirs();
        file.createNewFile();
        updateCheckManager.touch(a, remoteRepository, null);

        assertFalse(updateCheckManager.isUpdateRequired(a, remoteRepository));

        assertNull(

    }

    private void writeLastUpdated(File touchfile, String key, String error) {
        synchronized (touchfile.getAbsolutePath().intern()) {
            if (!touchfile.getParentFile().exists()
                    && !touchfile.getParentFile().mkdirs()) {
                getLogger()
                        .debug("Failed to create directory: " + touchfile.getParent()

    }

    if (testFileUrl.getProtocol().equals("file")) {
      try {
        File testFile = new File(testFileUrl.toURI());
        testDir = testFile.getParentFile(); // the testdata directory
      } catch (Exception ignore) {
        // probably URISyntaxException or IllegalArgumentException
        // fall back to copying URLs to files in the testDir == null block below
      }

            throw new FileAccessException("ECL0108");
        }

        this.propertiesFile = file;
        if (!this.propertiesFile.exists()) {
            final File parentDir = this.propertiesFile.getParentFile();
            if (!parentDir.exists()) {
                if (!parentDir.mkdir()) {
                    throw new FileAccessException("ECL0109", new Object[] { file.getAbsolutePath() });
                }