test_objectgrips-sparse-array.js

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/* Any copyright is dedicated to the Public Domain.

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

"use strict";

Services.prefs.setBoolPref("security.allow_eval_with_system_principal", true);

registerCleanupFunction(() => {

  Services.prefs.clearUserPref("security.allow_eval_with_system_principal");

});

add_task(

  threadFrontTest(async ({ threadFront, debuggee }) => {

    const packet = await executeOnNextTickAndWaitForPause(

      () => evalCode(debuggee),

      threadFront

);

    const [grip] = packet.frame.arguments;

    await threadFront.resume();

    strictEqual(grip.class, "Array", "The grip has an Array class");

    const { items } = grip.preview;

    strictEqual(items[0], null, "The empty slot has null as grip preview");

    deepEqual(

      items[1],

      { type: "undefined" },

      "The undefined value has grip value of type undefined"

);

})

);

function evalCode(debuggee) {

  debuggee.eval(

    // These arguments are tested.

    // eslint-disable-next-line no-unused-vars

    function stopMe(arr) {

      debugger;

    }.toString()

);

  debuggee.eval("stopMe([, undefined])");