private Properties userProperties;

    @Override
    public File getGlobalSettingsFile() {
        return globalSettingsFile;
    }

    @Override
    public DefaultSettingsBuildingRequest setGlobalSettingsFile(File globalSettingsFile) {
        this.globalSettingsFile = globalSettingsFile;

        return this;
    }

    @Override
    public SettingsSource getGlobalSettingsSource() {

        File userMavenDir
        File globalMavenDir
        File userSettingsFile = tmpDir.file("userSettingsFile")
        File globalSettingsFile = tmpDir.file("globalSettingsFile")
    }

        File globalSettingsFile = new File(basedir, "src/assembly/maven/conf/settings.xml");
        assertTrue(globalSettingsFile.isFile(), globalSettingsFile.getAbsolutePath());

        try (InputStream is = Files.newInputStream(globalSettingsFile.toPath())) {
            new SettingsStaxReader().read(is, true, new InputSource(globalSettingsFile.getAbsolutePath()));
        }
    }

    private boolean initialized = false
    private TestFile userHomeDir
    private TestFile userM2Directory
    private TestFile userSettingsFile
    private TestFile globalMavenDirectory
    private TestFile globalSettingsFile
    private TestFile isolatedMavenRepoForLeakageChecks
    private boolean isolateMavenLocal = true

    M2Installation(TestDirectoryProvider temporaryFolder) {
        this.temporaryFolder = temporaryFolder
    }

        File globalSettingsFile = getFile(
                "${maven.conf}/settings.xml", "maven.conf", MavenSettingsBuilder.ALT_GLOBAL_SETTINGS_XML_LOCATION);

        SettingsBuildingRequest request = new DefaultSettingsBuildingRequest();
        request.setUserSettingsFile(userSettingsFile);
        request.setGlobalSettingsFile(globalSettingsFile);

     * settings and global settings are given, the user settings take precedence.
     *
     * @param globalSettingsFile The global settings file, may be {@code null} to disable global settings.
     * @return This request, never {@code null}.
     */
    SettingsBuildingRequest setGlobalSettingsFile(File globalSettingsFile);

    /**
     * Gets the global settings source.
     *