}

  @Test fun ofThrowsOddNumberOfHeaders() {
    assertFailsWith<IllegalArgumentException> {
      headersOf("User-Agent", "OkHttp", "Content-Length")
    }
  }

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

  @Test fun ofAcceptsEmptyValue() {
    val headers = headersOf("User-Agent", "")