}

  private static void assertNotPrimitive(TypeToken<?> type) {
    assertFalse(type.isPrimitive());
    assertThat(type.wrap()).isEqualTo(type);
  }

  private static void assertIsWrapper(TypeToken<?> type) {
    assertNotPrimitive(type);
    assertEquals(TypeToken.of(Primitives.unwrap((Class<?>) type.getType())), type.unwrap());
  }