Thread.sleep(10) // Make sure the timestamps are unique.
    val cacheHit =
      executeSynchronously(
        "/",
        "Accept-Language",
        "en-US",
        "Accept-Charset",
        "UTF-8",
      )

    // Check the merged response. The request is the application's original request.
    cacheHit.assertCode(200)
      .assertBody("A")

        .addHeader("Accept-Language", "en-US")
        .build()
    val response1 = client.newCall(request1).execute()
    assertThat(response1.body.string()).isEqualTo("A")
    val request2 =
      Request.Builder()
        .url(url)
        .addHeader("Accept-Language", "fr-CA, fr-FR")
        .addHeader("Accept-Language", "en-US")
        .build()

[kotlin_1_9_21]: https://github.com/JetBrains/kotlin/releases/tag/v1.9.21
[kotlin_1_9_23]: https://github.com/JetBrains/kotlin/releases/tag/v1.9.23
[loom]: https://docs.oracle.com/en/java/javase/21/core/virtual-threads.html
[okio_2_9_0]: https://square.github.io/okio/changelog/#version-290
[okio_3_0_0]: https://square.github.io/okio/changelog/#version-300

        .build()

    executor = newVirtualThreadPerTaskExecutor()

    // Capture non-deterministic but probable sysout warnings of pinned threads
    // https://docs.oracle.com/en/java/javase/21/core/virtual-threads.html
    System.setOut(PrintStream(capturedOut))
  }

  @AfterEach
  fun checkForPinning() {
    assertThat(capturedOut.toString()).isEmpty()
  }