browser_browsingContext-getCurrentTopByBrowserId.js

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"use strict";

add_task(async function test_browserId_change_then_discard() {

  const tab = await BrowserTestUtils.openNewForegroundTab(

    gBrowser,

    "https://example.com/"

);

  const bc = tab.linkedBrowser.browsingContext;

  const oldId = bc.browserId;

is(

    BrowsingContext.getCurrentTopByBrowserId(oldId),

bc,

    "lookup by initial browserId"

);

  const newId = oldId + 1000000;

ok(

    !BrowsingContext.getCurrentTopByBrowserId(newId),

    "new browserId is unused"

);

  bc.browserId = newId;

  const discarded = TestUtils.waitForCondition(() => bc.isDiscarded);

  BrowserTestUtils.removeTab(tab);

  await discarded;

is(

    BrowsingContext.getCurrentTopByBrowserId(oldId),

    null,

    "initial browserId no longer resolves after discard"

);

is(

    BrowsingContext.getCurrentTopByBrowserId(newId),

    null,

    "new browserId does not resolve after discard"

);

});