fun iterateCache() {
    // Put some responses in the cache.
    server.enqueue(
      MockResponse
        .Builder()
        .body("a")
        .build(),
    )
    val urlA = server.url("/a")
    assertThat(get(urlA).body.string()).isEqualTo("a")
    server.enqueue(
      MockResponse
        .Builder()
        .body("b")
        .build(),
    )
    val urlB = server.url("/b")