}
  }

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

  @Test fun addThrowsOnMultiColon() {
    assertFailsWith<IllegalArgumentException> {
      Headers.Builder().add(":status: 200 OK")
    }
  }

  @Test fun addUnsafeNonAsciiRejectsUnicodeName() {