.set("testDate", expected)
        .build()
    assertThat(headers["testDate"]).isEqualTo("Thu, 01 Jan 1970 00:00:01 GMT")
    assertThat(headers.getDate("testDate")).isEqualTo(expected)
  }

  @Test fun setInstant() {
    val expected = Instant.ofEpochMilli(1000L)
    val headers =
      Headers
        .Builder()
        .add("Test-Instant", Instant.ofEpochMilli(0L))
        .set("Test-Instant", expected)
        .build()