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Test Info: Warnings
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CI results over the last 21 days
- This test gets skipped with pattern: !fission
- Manifest: docshell/test/browser/browser.toml
/* Any copyright is dedicated to the Public Domain.
"use strict";
const TEST_URL =
getRootDirectory(gTestPath).replace(
) + "dummy_page.html";
const NEW_URL = TEST_URL.replace("example.com", "example.org");
// For a load started in the parent, the parent can decide whether the
// previous page goes into the BFCache before the content process has
// connected its DocumentChannel. Delay that connection to check the decision
// doesn't depend on it.
add_task(async function test_bfcache_before_document_channel_connects() {
await SpecialPowers.pushPrefEnv({
set: [["browser.sessionhistory.max_total_viewers", 10]],
});
await BrowserTestUtils.withNewTab(TEST_URL, async browser => {
await SpecialPowers.spawn(browser, [], () => {
content.addEventListener("pageshow", event => {
content.wrappedJSObject.wasRestored = event.persisted;
});
});
// Keep this task alive until the observer has run; the empty spawn below
// makes sure it is registered before the load starts.
const blocked = SpecialPowers.spawn(browser, [], async () => {
const { promise, resolve } = Promise.withResolvers();
Services.obs.addObserver(function observer() {
Services.obs.removeObserver(observer, "document-on-opening-request");
const end = Date.now() + 1000;
while (Date.now() < end) {
// Block the content process before the DocumentChannel is sent,
// giving the parent time to run its process switch check.
}
resolve();
}, "document-on-opening-request");
await promise;
});
await SpecialPowers.spawn(browser, [], () => {});
// Hold the response so that the parent's process switch check runs while
// the content process is blocked above.
Services.obs.addObserver(function observer(subject) {
const channel = subject.QueryInterface(Ci.nsIHttpChannel);
if (channel.URI.spec != NEW_URL) {
return;
}
Services.obs.removeObserver(observer, "http-on-modify-request");
channel.suspend();
// The content process can not signal while it is blocked.
// eslint-disable-next-line mozilla/no-arbitrary-setTimeout
setTimeout(() => channel.resume(), 500);
}, "http-on-modify-request");
const loaded = BrowserTestUtils.browserLoaded(browser, false, NEW_URL);
BrowserTestUtils.startLoadingURIString(browser, NEW_URL);
await blocked;
await loaded;
const shown = BrowserTestUtils.waitForContentEvent(browser, "pageshow");
browser.goBack();
await shown;
is(browser.currentURI.spec, TEST_URL, "Went back to the first page");
// waitForContentEvent only resolves with the event name, so the listener
// added above records whether the page came from the BFCache.
await SpecialPowers.spawn(browser, [], () => {
ok(
content.wrappedJSObject.wasRestored,
"The first page was restored from the BFCache"
);
});
});
});