assertThat(headers.values("key")).containsExactly("value")
    assertThat(headers.values("ping")).containsExactly("pong")
    assertThat(headers.values("kit")).containsExactly("kat")
  }

  @Test fun addThrowsOnEmptyName() {
    assertFailsWith<IllegalArgumentException> {
      Headers.Builder().add(": bar")
    }
    assertFailsWith<IllegalArgumentException> {

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