new TypeToken<ListMap<String, Object>>() {}.getSupertype(Map.class).getType());
  }

  private interface StringListMap<V> extends ListMap<String, V> {}

  public <V> void testGetSupertype_partiallySpecializedType() {
    Type expectedType = new TypeToken<Map<String, List<V>>>() {}.getType();
    assertEquals(
        expectedType, new TypeToken<StringListMap<V>>() {}.getSupertype(Map.class).getType());
  }