nixpkgs/nixos/tests/cups-pdf.nix

import ./make-test-python.nix (
  { lib, pkgs, ... }:
  {
    name = "cups-pdf";

    nodes.machine =
      { pkgs, ... }:
      {
        imports = [ ./common/user-account.nix ];
        environment.systemPackages = [ pkgs.poppler_utils ];
        fonts.packages = [ pkgs.dejavu_fonts ]; # yields more OCR-able pdf
        services.printing.cups-pdf.enable = true;
        services.printing.cups-pdf.instances = {
          opt = { };
          noopt.installPrinter = false;
        };
        hardware.printers.ensurePrinters = [
          {
            name = "noopt";
            model = "CUPS-PDF_noopt.ppd";
            deviceUri = "cups-pdf:/noopt";
          }
        ];
      };

    # we cannot check the files with pdftotext, due to
    # https://github.com/alexivkin/CUPS-PDF-to-PDF/issues/7
    # we need `imagemagickBig` as it has ghostscript support

    testScript = ''
      from subprocess import run
      machine.wait_for_unit("multi-user.target")
      for name in ("opt", "noopt"):
          text = f"test text {name}".upper()
          machine.wait_until_succeeds(f"lpstat -v {name}")
          machine.succeed(f"su - alice -c 'echo -e \"\n  {text}\" | lp -d {name}'")
          # wait until the pdf files are completely produced and readable by alice
          machine.wait_until_succeeds(f"su - alice -c 'pdfinfo /var/spool/cups-pdf-{name}/users/alice/*.pdf'")
          machine.succeed(f"cp /var/spool/cups-pdf-{name}/users/alice/*.pdf /tmp/{name}.pdf")
          machine.copy_from_vm(f"/tmp/{name}.pdf", "")
          run(f"${pkgs.imagemagickBig}/bin/convert -density 300 $out/{name}.pdf $out/{name}.jpeg", shell=True, check=True)
          assert text.encode() in run(f"${lib.getExe pkgs.tesseract} $out/{name}.jpeg stdout", shell=True, check=True, capture_output=True).stdout
    '';

    meta.maintainers = [ lib.maintainers.yarny ];
  }
)