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<!DOCTYPE HTML>
<html>
<head>
  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
</head>
<body onload="run()">
<script>

SimpleTest.waitForExplicitFinish();

async function run() {
  try {
    let printerList = Cc["@mozilla.org/gfx/printerlist;1"].getService(
      Ci.nsIPrinterList
    );
    var settingsSvc = Cc["@mozilla.org/gfx/printsettings-service;1"].getService(
      Ci.nsIPrintSettingsService
    );

    let printers = await printerList.printers;
    for (let printer of printers) {
      printer.QueryInterface(Ci.nsIPrinter);
      let printerInfo = await printer.printerInfo;

      // Look up the printer's defaultSettings:
      let defaultSettings = printerInfo.defaultSettings;

      // Let the printer impose its defaults onto a fresh settings object:
      let freshSettings = settingsSvc.createNewPrintSettings();
      printerList.initPrintSettingsFromPrinter(printer.name, freshSettings);

      // Make sure they agree on the default orientation:
      is(freshSettings.orientation, defaultSettings.orientation,
         "initPrintSettingsFromPrinter should produce the same orientation " +
         "as the printer's defaultSettings");
    }

    // This ok() just lets us avoid failure-due-to-no-tests-being-run, on
    // devices that have no printers available & hence skip the loop above:
    ok(true, "Finished traversing printers.");
  } catch (e) {
    ok(false, `Error thrown while retrieving printer info: ${e}.`);
    console.error(e);
  }
  SimpleTest.finish();
}

</script>
</body>
</html>