}
  }

  @Test fun ofThrowsOnEmptyName() {
    assertFailsWith<IllegalArgumentException> {
      headersOf("", "OkHttp")
    }
  }

  @Test fun ofAcceptsEmptyValue() {
    val headers = headersOf("User-Agent", "")
    assertThat(headers.value(0)).isEqualTo("")
  }

  @Test fun ofMakesDefensiveCopy() {
    val namesAndValues =
      arrayOf(
        "User-Agent",