code: public static MediaType nonBinaryUtf8( MediaType.Type type, String subType ) {
          return new MediaType( type, subType, UTF_8 );
      }
docs: Creates a non-binary media type with the given type, subtype, and UTF-8 encoding
  @throws com.tngtech.jgiven.exception.JGivenWrongUsageException if any of the given arguments is {@code null}