test_printer_default_settings.html

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<!DOCTYPE HTML>

<html>

<head>

  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>

</head>

<body onload="run()">

<script type="application/javascript">

SimpleTest.waitForExplicitFinish();

async function run() {

  try {

    let printerList = Cc["@mozilla.org/gfx/printerlist;1"].getService(

      Ci.nsIPrinterList

);

    let printers = await printerList.printers;

    if (printers.length == 0) {

      ok(true, "There were no printers to iterate through.");

    for (let printer of printers) {

      printer.QueryInterface(Ci.nsIPrinter);

      info(printer.name);

      info("duplex(" + await printer.supportsDuplex + ")");

      const printerInfo = await printer.printerInfo;

      const settings = printerInfo.defaultSettings;

      settings.QueryInterface(Ci.nsIPrintSettings);

      is(typeof settings.printerName, "string", "Printer name should be a string.");

      is(settings.printerName, printer.name, "Print settings' printer should match the printer that created them.");

      is(typeof settings.paperId, "string", "Paper ID should never be null.");

      is(typeof settings.paperWidth, "number", "Paper width should never be null.");

      is(typeof settings.paperHeight, "number", "Paper height should never be null.");

      if (settings.paperId != "") {

        info(`Paper: ${settings.paperId}`);

        info(`Size:  (${settings.paperWidth} x ${settings.paperHeight})`);

        ok(settings.paperWidth  > 0.0, "Paper width should be greater than zero.");

        ok(settings.paperHeight > 0.0, "Paper height should be greater than zero.");

      ok(settings.marginTop    >= 0.0, "Paper margins should be greater than or equal to zero.");

      ok(settings.marginRight  >= 0.0, "Paper margins should be greater than or equal to zero.");

      ok(settings.marginBottom >= 0.0, "Paper margins should be greater than or equal to zero.");

      ok(settings.marginLeft   >= 0.0, "Paper margins should be greater than or equal to zero.");

      is(settings.printInColor, await printer.supportsColor, "Print settings' color mode should match the printer's color support.");

      ok(settings.isInitializedFromPrinter, "Print settings were initialized from printer");

      ok(!settings.isInitializedFromPrefs);

  } catch (e) {

    ok(false, `Shouldn't throw: ${e}`);

    console.error(e);

  SimpleTest.finish();

</script>

</body>

</html>