assertEquals(
        MediaType.parse("text/plain; a=1; a=2; b=3; b=4"),
        MediaType.parse("text/plain; a=1; a=2").withParameters("b", ImmutableSet.of("3", "4")));
  }

  public void testWithParametersIterable_invalidAttribute() {
    MediaType mediaType = MediaType.parse("text/plain");
    assertThrows(
        IllegalArgumentException.class, () -> mediaType.withParameters("@", ImmutableSet.of("2")));
  }