list.add(newArtifact("c"));
        list.add(newArtifact("e"));
        list.add(newArtifact("d"));

        Map<String, Artifact> map = ArtifactUtils.artifactMapByVersionlessId(list);
        assertNotNull(map);
        assertEquals(list, new ArrayList<>(map.values()));
    }

    private final Map<String, String> userProperties;
    private final Map<String, String> systemProperties;
    private final Instant startTime = Instant.now();

    ProtoSession(RepositorySystemSession session, RepositorySystem repositorySystem, Lookup lookup) {
        this(session, repositorySystem, Collections.emptyList(), null, lookup, new Context(Map.of(), Map.of()));
    }

    protected ProtoSession(

            new TestStringMapGenerator() {
              @Override
              protected Map<String, String> create(Entry<String, String>[] entries) {
                Map<String, String> map = populate(new HashMap<String, String>(), entries);
                return Collections.checkedMap(map, String.class, String.class);
              }
            })
        .named("checkedMap/HashMap")
        .withFeatures(

    default void interpolate(
            @Nonnull Map<String, String> map, @Nullable Function<String, String> callback, boolean defaultsToEmpty) {
        interpolate(map, callback, null, defaultsToEmpty);
    }

    /**
     * Interpolates the values in the given map using the provided callback function.
     *
     * @param map The map containing key-value pairs to be interpolated.

        return list != null ? Collections.unmodifiableList(list) : Collections.emptyList();
    }

    private static Map<String, String> unmodifiable(Map<String, String> map) {
        return map != null ? Collections.unmodifiableMap(map) : Collections.emptyMap();
    }

    private static Map<String, String> toMap(Properties properties) {
        if (properties != null && !properties.isEmpty()) {

   * RowSortedTable subinterface with the revised methods?
   */

  StandardRowSortedTable(
      SortedMap<R, Map<C, V>> backingMap, Supplier<? extends Map<C, V>> factory) {
    super(backingMap, factory);
  }

  private SortedMap<R, Map<C, V>> sortedBackingMap() {
    return (SortedMap<R, Map<C, V>>) backingMap;
  }

  /**
   * {@inheritDoc}
   *

     * {@link org.codelibs.core.collection.CollectionsUtil#isEmpty(java.util.Map)}
     * .
     */
    @Test
    public void testIsEmptyMapOfQQ() {
        HashMap<String, String> map = null;
        assertThat(CollectionsUtil.isEmpty(map), is(true));
        map = new HashMap<String, String>();
        assertThat(CollectionsUtil.isEmpty(map), is(true));
    }

    /**
     * Test method for

    }

    public void putAll(final Map<String, String> map) {
        params.putAll(map);
    }

    public boolean containsKey(final String key) {
        return params.containsKey(key);
    }

    public Map<String, Object> asMap() {
        return new ParamMap<>(new HashMap<>(getDataMap(params)));
    }

    protected static Map<String, Object> getDataMap(final Map<String, Object> params) {

   * putAll()}.
   *
   * @return a map view from each row key to a secondary map from column keys to values
   */
  Map<R, Map<C, V>> rowMap();

  /**
   * Returns a view that associates each column key with the corresponding map from row keys to
   * values. Changes to the returned map will update this table. The returned map does not support

        /**
         * @param param
         * @return 戻り値
         */
        @SuppressWarnings("rawtypes")
        Map rawMap(Map param);

        /**
         * @param param
         * @return 戻り値
         */
        Map<String, Class<?>> genericMap(Map<Integer, String> param);

    }