fun onlyIfCachedReturns504WhenNotCached() {
    executeSynchronously("/", "Cache-Control", "only-if-cached")
      .assertCode(504)
      .assertBody("")
      .assertNoNetworkResponse()
      .assertNoCacheResponse()
  }

  @Test
  fun networkDropsOnConditionalGet() {
    client =
      client
        .newBuilder()
        .cache(cache)
        .build()

    // Seed the cache.