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 */
@Timeout(30)
class FastFallbackTest {
  @RegisterExtension
  val clientTestRule = OkHttpClientTestRule()

  // Don't use JUnit 5 test rules for these; otherwise we can't bind them to a single local IP.
  private lateinit var localhostIpv4: InetAddress
  private lateinit var localhostIpv6: InetAddress
  private lateinit var serverIpv4: MockWebServer
  private lateinit var serverIpv6: MockWebServer