browser_webconsole_strict_mode_errors.js

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/* Any copyright is dedicated to the Public Domain.

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

// Check that "use strict" JS errors generate errors, not warnings.

"use strict";

add_task(async function () {

  const hud = await openNewTabAndConsole(

    "data:text/html;charset=utf8,<!DOCTYPE html>empty page"

);

  await loadScriptURI("'use strict';var arguments;");

  await waitForError(

    hud,

    "SyntaxError: 'arguments' can't be defined or assigned to in strict mode code"

);

  await loadScriptURI("'use strict';function f(a, a) {};");

  await waitForError(hud, "SyntaxError: duplicate formal argument a");

  await loadScriptURI("'use strict';var o = {get p() {}};o.p = 1;");

  await waitForError(hud, 'TypeError: setting getter-only property "p"');

  await loadScriptURI("'use strict';v = 1;");

  await waitForError(

    hud,

    "ReferenceError: assignment to undeclared variable v"

);

});

async function waitForError(hud, text) {

  await waitFor(() => findErrorMessage(hud, text));

  ok(true, "Received expected error message");

function loadScriptURI(script) {

  // On e10s, the exception is triggered in child process

  // and is ignored by test harness

  if (!Services.appinfo.browserTabsRemoteAutostart) {

    expectUncaughtException();

  const uri =

    "data:text/html;charset=utf8,<!DOCTYPE html><script>" +

    script +

    "</script>";

  return navigateTo(uri);