test_create_single.js

Enable keyboard shortcuts

/* Any copyright is dedicated to the Public Domain.

 * http://creativecommons.org/publicdomain/zero/1.0/ */

const ETLD_CONTRACT_ID = "@mozilla.org/network/effective-tld-service;1";

function run_test() {

  // The effective TLD service is a singleton, so createInstance is not allowed

  // on it: it must be accessed via the service getters.

  Assert.throws(

    () => Cc[ETLD_CONTRACT_ID].createInstance(Ci.nsIEffectiveTLDService),

    e => e.result == Cr.NS_ERROR_XPC_CI_RETURNED_FAILURE,

    "createInstance should throw for a singleton component"

);

  // Check that the service getters all return the same object.

  // eslint-disable-next-line mozilla/use-services

  let etld = Cc[ETLD_CONTRACT_ID].getService(Ci.nsIEffectiveTLDService);

  Assert.equal(etld, Services.eTLD, "getService returns the singleton");

  // For backwards compatibility reasons, we allow calling createInstance for

  // the system principal, so it should not throw.

  let principal = Cc["@mozilla.org/systemprincipal;1"].createInstance(

    Ci.nsIPrincipal

);

  Assert.notEqual(principal, undefined);