test_generateQI.js

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"use strict";

add_task(async function test_generateQI() {

  function checkQI(interfaces, iface) {

    let obj = {

      QueryInterface: ChromeUtils.generateQI(interfaces),

};

    equal(obj.QueryInterface(iface), obj,

         `Correct return value for query to ${iface}`);

  // Test success scenarios.

  checkQI([], Ci.nsISupports);

  checkQI([Ci.nsIPropertyBag, "nsIPropertyBag2"], Ci.nsIPropertyBag);

  checkQI([Ci.nsIPropertyBag, "nsIPropertyBag2"], Ci.nsIPropertyBag2);

  checkQI([Ci.nsIPropertyBag, "nsIPropertyBag2", "nsINotARealInterface"], Ci.nsIPropertyBag2);

  // Non-IID values get stringified, and don't cause any errors as long

  // as there isn't a non-IID property with the same name on Ci.

  checkQI([Ci.nsIPropertyBag, "nsIPropertyBag2", null, Object], Ci.nsIPropertyBag2);

  ChromeUtils.generateQI([])(Ci.nsISupports);

  // Test failure scenarios.

  Assert.throws(() => checkQI([], Ci.nsIPropertyBag),

                e => e.result == Cr.NS_ERROR_NO_INTERFACE);

});