val headers = headersOf("Pragma", "must-revalidate")
    val cacheControl = parse(headers)
    assertThat(cacheControl.toString()).isEqualTo("must-revalidate")
  }

  @Test
  fun computedHeaderValueIsCached() {
    val cacheControl =
      CacheControl
        .Builder()
        .maxAge(2, TimeUnit.DAYS)
        .build()
    assertThat(cacheControl.toString()).isEqualTo("max-age=172800")