when:
        File userHome2 = tmpDir.file("user_home_2")
        1 * mavenFileLocations.getUserMavenDir() >> new File(userHome2, ".m2")
        then:
        locator.localMavenRepository == new File(userHome2, ".m2/repository")
    }

    def "returns value of system property if it is specified"() {
        when:

    <mapping directory="" vcs="Git" />
  </component>
  <component name="libraryTable">
  <library name="scala-compiler-2.10.0">
    <CLASSES>
      <root url="jar://$USER_HOME$/lib1.jar!/" />
      <root url="jar://$USER_HOME$/lib2.jar!/" />
      <root url="jar://$USER_HOME$/lib3.jar!/" />
    </CLASSES>
    <JAVADOC />
    <SOURCES />
  </library>
</component>

    <CLASSES>
      <root url="jar://\$USER_HOME\$/class/one.jar!/"/>
      <root url="jar://\$USER_HOME\$/class/two.jar!/"/>
    </CLASSES>
    <JAVADOC>
      <root url="jar://\$USER_HOME\$/javadoc/one.jar!/"/>
      <root url="jar://\$USER_HOME\$/javadoc/two.jar!/"/>
    </JAVADOC>
    <SOURCES>
      <root url="jar://\$USER_HOME\$/source/one.jar!/"/>
      <root url="jar://\$USER_HOME\$/source/two.jar!/"/>
    </SOURCES>

        System.out.println(SystemUtil.OS_NAME);
        System.out.println(SystemUtil.JAVA_IO_TMPDIR);
        System.out.println(SystemUtil.USER_DIR);
        System.out.println(SystemUtil.USER_HOME);
    }

@Singleton
public class SettingsXmlConfigurationProcessor implements ConfigurationProcessor {
    public static final String HINT = "settings";

    public static final String USER_HOME = System.getProperty("user.home");

    public static final File USER_MAVEN_CONFIGURATION_HOME = new File(USER_HOME, ".m2");

    public static final File DEFAULT_USER_SETTINGS_FILE = new File(USER_MAVEN_CONFIGURATION_HOME, "settings.xml");

     * <code>user.dir</code> システムプロパティ。
     */
    public static final String USER_DIR = System.getProperty("user.dir");

    /**
     * <code>user.home</code> システムプロパティ。
     */
    public static final String USER_HOME = System.getProperty("user.home");

    public static long currentTimeMillis() {
        // TODO provider
        return System.currentTimeMillis();
    }

  /** Line separator ("\n" on UNIX). */
  LINE_SEPARATOR("line.separator"),

  /** User's account name. */
  USER_NAME("user.name"),

  /** User's home directory. */
  USER_HOME("user.home"),

  /** User's current working directory. */
  USER_DIR("user.dir");

  private final String key;

  StandardSystemProperty(String key) {
    this.key = key;
  }

  /** Line separator ("\n" on UNIX). */
  LINE_SEPARATOR("line.separator"),

  /** User's account name. */
  USER_NAME("user.name"),

  /** User's home directory. */
  USER_HOME("user.home"),

  /** User's current working directory. */
  USER_DIR("user.dir");

  private final String key;

  StandardSystemProperty(String key) {
    this.key = key;
  }

While the Gradle Wrapper is local to the root project, the Gradle executable is found in the `GRADLE_USER_HOME`.

The `GRADLE_USER_HOME`, which defaults to `USER_HOME/.gradle`, is also where Gradle stores its global configuration properties, initialization scripts, caches, log files and more.

== Step 3. Review the Gradle Files

The `settings.gradle(.kts)` file has two interesting lines:

TIP: publishToMavenLocal` does not create checksum files in `$USER_HOME/.m2/repository`.