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Test Info:
- Manifest: docshell/test/browser/browser.toml
"use strict";
const TOPIC = "browsing-context-discarded";
async function observeDiscarded(browsingContexts, callback) {
let discarded = new Map();
let promise = BrowserUtils.promiseObserved(TOPIC, (subject, why) => {
ok(BrowsingContext.isInstance(subject), "subject to be a BrowsingContext");
discarded.set(subject, why);
return browsingContexts.every(item => discarded.has(item));
});
await callback();
await promise;
return discarded;
}
function check_reason(discardedContexts, expected) {
discardedContexts.forEach((why, browsingContext) => {
if (expected.has(browsingContext)) {
is(why, expected.get(browsingContext));
}
});
}
add_task(async function toplevelForNewWindow() {
const win = await BrowserTestUtils.openNewBrowserWindow();
const browsingContext = win.gBrowser.selectedBrowser.browsingContext;
const expected = new Map([
[win.browsingContext, "discard"],
[browsingContext, "discard"],
]);
const discarded = await observeDiscarded([...expected.keys()], async () => {
await BrowserTestUtils.closeWindow(win);
});
check_reason(discarded, expected);
});
add_task(async function toplevelForNewTab() {
const tab = await BrowserTestUtils.openNewForegroundTab(gBrowser);
const browsingContext = tab.linkedBrowser.browsingContext;
const expected = new Map([[browsingContext, "discard"]]);
const discarded = await observeDiscarded([...expected.keys()], () => {
BrowserTestUtils.removeTab(tab);
});
ok(
!discarded.has(window.browsingContext),
"no notification for the current window's chrome browsing context"
);
check_reason(discarded, expected);
});
add_task(async function subframe() {
const tab = await BrowserTestUtils.openNewForegroundTab(gBrowser);
const frameBrowsingContext = await SpecialPowers.spawn(
tab.linkedBrowser,
[],
() => {
const iframe = content.document.createElement("iframe");
iframe.src = "https://example.com/";
content.document.body.appendChild(iframe);
return iframe.browsingContext;
}
);
const expected = new Map([[frameBrowsingContext, "discard"]]);
const discarded = await observeDiscarded([...expected.keys()], async () => {
await SpecialPowers.spawn(tab.linkedBrowser, [], () => {
let iframe = content.document.querySelector("iframe");
iframe.remove();
});
});
ok(
!discarded.has(tab.linkedBrowser.browsingContext),
"no notification for toplevel browsing context"
);
ok(
!discarded.has(window.browsingContext),
"no notification for the current window's chrome browsing context"
);
check_reason(discarded, expected);
BrowserTestUtils.removeTab(tab);
});
add_task(async function replaceToplevel() {
const tab = await BrowserTestUtils.openNewForegroundTab(gBrowser);
// Force load about:blank such that BC::HasLoadedNonInitialDocument is true
// which means it's BFCache eligible and will be replaced
BrowserTestUtils.startLoadingURIString(tab.linkedBrowser, "about:blank");
await BrowserTestUtils.browserLoaded(tab.linkedBrowser, {
wantLoad: "about:blank",
});
// Make it transient so that it doesn't stay in SH and the BC is discarded
tab.linkedBrowser.browsingContext.sessionHistory
.getEntryAtIndex(0)
.setTransient();
const browsingContext = tab.linkedBrowser.browsingContext;
const expected = new Map([[browsingContext, "replace"]]);
const discarded = await observeDiscarded([...expected.keys()], async () => {
await SpecialPowers.spawn(tab.linkedBrowser, [], () => {
content.location = "about:newtab";
});
});
ok(
!discarded.has(window.browsingContext),
"no notification for the current window's chrome browsing context"
);
check_reason(discarded, expected);
BrowserTestUtils.removeTab(tab);
});