public void testCreate_emptySubtype() {
    assertThrows(IllegalArgumentException.class, () -> MediaType.create("a", ""));
  }

  public void testCreateApplicationType() {
    MediaType newType = MediaType.createApplicationType("yams");
    assertEquals("application", newType.type());
    assertEquals("yams", newType.subtype());
  }

  public void testCreateAudioType() {
    MediaType newType = MediaType.createAudioType("yams");

  }

  /**
   * Creates a media type with the "application" type and the given subtype.
   *
   * @throws IllegalArgumentException if subtype is invalid
   */
  static MediaType createApplicationType(String subtype) {
    return create(APPLICATION_TYPE, subtype);
  }

  /**
   * Creates a media type with the "audio" type and the given subtype.
   *