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Test Info:

/* Any copyright is dedicated to the Public Domain.
"use strict";
let badPrinterName = "Bad";
let otherPrinterName = "Fallback";
async function setupPrinters(helper) {
let badPrinter = helper.addMockPrinter({
name: badPrinterName,
});
let badPrinterInfo = await badPrinter.printerInfo;
badPrinterInfo.defaultSettings.printerName = "";
helper.addMockPrinter(otherPrinterName);
await SpecialPowers.pushPrefEnv({
set: [["print_printer", badPrinterName]],
});
}
add_task(async function testBadPrinterSettings() {
await PrintHelper.withTestPage(async helper => {
await setupPrinters(helper);
await helper.startPrint();
let destinationPicker = helper.get("printer-picker");
// Fallback can be any other printer, the fallback or save to pdf printer.
isnot(
destinationPicker.value,
badPrinterName,
"A fallback printer is selected"
);
await helper.closeDialog();
});
});