)
      }

    fun build(): HttpUrl {
      @Suppress("UNCHECKED_CAST") // percentDecode returns either List<String?> or List<String>.
      return HttpUrl(
        scheme = scheme ?: throw IllegalStateException("scheme == null"),
        username = encodedUsername.percentDecode(),
        password = encodedPassword.percentDecode(),
        host = host ?: throw IllegalStateException("host == null"),

  }

  @Test
  fun decodeEmptyPathSegments() {
    assertThat(parse("http://host/").pathSegments).containsExactly("")
  }

  @Test
  fun percentDecode() {
    assertThat(parse("http://host/%00").pathSegments).containsExactly("\u0000")
    assertThat(parse("http://host/a/%E2%98%83/c").pathSegments)
      .containsExactly("a", "\u2603", "c")