"User-Agent",
        "OkHttp",
      )
    val headers = headersOf(*namesAndValues)
    namesAndValues[1] = "Chrome"
    assertThat(headers.value(0)).isEqualTo("OkHttp")
  }

  @Test fun ofRejectsNullChar() {
    assertFailsWith<IllegalArgumentException> {
      headersOf("User-Agent", "Square\u0000OkHttp")
    }
  }

  @Test fun ofMapThrowsOnEmptyName() {
    assertFailsWith<IllegalArgumentException> {