* </ul>
 *
 * @since 4.0.0
 */
@Experimental
public interface OsService extends Service {
    /**
     * Returns the OS full name as reported by the system property "os.name".
     * The value is converted to lowercase for consistency.
     *
     * @return the operating system name (never null)
     */
    @Nonnull
    String name();

    /**
     * Returns the OS architecture as reported by the system property "os.arch".

    Multimap<K, V> source = getSubjectGenerator().create(mapEntry(k0(), null));
    assertTrue(multimap().putAll(source));
    assertTrue(multimap().containsEntry(k0(), null));
  }

  @MapFeature.Require({SUPPORTS_PUT, ALLOWS_NULL_KEYS})
  public void testPutAllWithNullKey() {
    Multimap<K, V> source = getSubjectGenerator().create(mapEntry(null, v0()));
    assertTrue(multimap().putAll(source));

    Multimap<K, V> source = getSubjectGenerator().create(mapEntry(k0(), null));
    assertTrue(multimap().putAll(source));
    assertTrue(multimap().containsEntry(k0(), null));
  }

  @MapFeature.Require({SUPPORTS_PUT, ALLOWS_NULL_KEYS})
  public void testPutAllWithNullKey() {
    Multimap<K, V> source = getSubjectGenerator().create(mapEntry(null, v0()));
    assertTrue(multimap().putAll(source));

     */
    String getProjectId();

    /**
     * Gets the POM file from which the project was built.
     *
     * @return The POM file or {@code null} if unknown.
     */
    File getPomFile();

    /**
     * Gets the project that was built.
     *
     * @return The project that was built or {@code null} if an error occurred and this result accompanies a

        if (distMgmt != null) {
            Relocation relocation = distMgmt.getRelocation();
            if (relocation != null) {
                Artifact result = new RelocatedArtifact(
                        artifactDescriptorResult.getRequest().getArtifact(),
                        relocation.getGroupId(),
                        relocation.getArtifactId(),
                        null,
                        null,

   */
  protected Entry<K, V>[] createArrayWithNullValue() {
    Entry<K, V>[] array = createSamplesArray();
    int nullValueLocation = getNullLocation();
    Entry<K, V> oldEntry = array[nullValueLocation];
    array[nullValueLocation] = mapEntry(oldEntry.getKey(), null);
    return array;
  }

  /**

        return new DefaultClassRealmManager(
                new DefaultCoreRealm(container),
                new ArrayList<ClassRealmManagerDelegate>(),
                new CoreExports(new ClassRealm(null, "test", null), new HashSet<String>(), exportedPackages));
    }

    private List<Artifact> newTestArtifactList() {
        List<Artifact> artifacts = new ArrayList<Artifact>();

        Artifact artifact = mock(Artifact.class);

        }
        return (attribute == null) ? null : new Xpp3DomAttributePointer(parent, attribute);
    }

    @Override
    public int getPosition() {
        return position;
    }

    @Override
    public boolean setPosition(int position) {
        this.position = position;
        attribute = (position > 0 && position <= attributes.size()) ? attributes.get(position - 1) : null;
        return attribute != null;
    }

     * used as well.
     *
     * @param prefix The plugin prefix to resolve, must not be {@code null}.
     * @param session The build session from which to derive further settings, must not be {@code null}.
     */
    public DefaultPluginPrefixRequest(String prefix, MavenSession session) {
        setPrefix(prefix);

  }

  /*
   * Our implementation works fine with a null `dir`. However, there's nothing in the documentation
   * of the supertype that suggests that implementations are expected to tolerate null. That said, I
   * see calls in Google code that pass a null `dir` to a FilenameFilter.... So let's declare the
   * parameter as non-nullable (since passing null to a FilenameFilter is unsafe in general), but if