assertThat(TypeToken.of(Types.supertypeOf(String.class)).getGenericInterfaces()).isEmpty();
    assertThat(TypeToken.of(Types.supertypeOf(String[].class)).getGenericInterfaces()).isEmpty();
  }

  public void testGetGenericInterfaces_wildcard_boundIsClass() {
    assertThat(TypeToken.of(Types.subtypeOf(Object.class)).getGenericInterfaces()).isEmpty();

    assertThat(TypeToken.of(Types.supertypeOf(String.class)).getGenericInterfaces()).isEmpty();
    assertThat(TypeToken.of(Types.supertypeOf(String[].class)).getGenericInterfaces()).isEmpty();
  }

  public void testGetGenericInterfaces_wildcard_boundIsClass() {
    assertThat(TypeToken.of(Types.subtypeOf(Object.class)).getGenericInterfaces()).isEmpty();

   * similar but different from {@link Class#getGenericInterfaces()}. For example, {@code new
   * TypeToken<List<String>>() {}.getGenericInterfaces()} will return a list that contains {@code
   * new TypeToken<Iterable<String>>() {}}; while {@code List.class.getGenericInterfaces()} will
   * return an array that contains {@code Iterable<T>}, where the {@code T} is the type variable

            gatherTypeVariables(superClass, superClassType, map);
        }

        final Class<?>[] interfaces = clazz.getInterfaces();
        final Type[] interfaceTypes = clazz.getGenericInterfaces();
        for (int i = 0; i < interfaces.length; ++i) {
            gatherTypeVariables(interfaces[i], interfaceTypes[i], map);
        }

        return map;
    }

    /**