test_wpt_actor_pref.js

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"use strict";

// The WPTEvents actor is gated on extensions.wpt.enabled at startup, so a

// runtime pref flip only affects the browser.test bindings, not the actor.

add_task(async function test_runtime_pref_flip_does_not_enable_actor() {

  Assert.equal(

    Services.prefs.getBoolPref("extensions.wpt.enabled", false),

    false,

    "extensions.wpt.enabled is off by default."

);

  Assert.equal(

    Cu.isESModuleLoaded("resource://gre/modules/ExtensionParent.sys.mjs"),

    false,

    "ExtensionParent not preloaded; actor registration check runs on import."

);

  ChromeUtils.importESModule("resource://gre/modules/ExtensionParent.sys.mjs");

  // Runtime flip: affects bindings only, not the already-decided actor.

  Services.prefs.setBoolPref("extensions.wpt.enabled", true);

  // Negative counterpart to test_wpt_test_events.js. Keep actor name in sync.

  let page = await ExtensionTestUtils.loadContentPage("about:blank");

  Assert.throws(

    () => page.browsingContext.currentWindowGlobal.getActor("WPTEvents"),

    /No such JSWindowActor/,

    "WPTEvents actor stays unregistered after a runtime pref flip."

);

  await page.close();

  Services.prefs.clearUserPref("extensions.wpt.enabled");

});