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Test Info:
- Manifest: docshell/test/browser/browser.toml
"use strict";
add_task(async function () {
const outer =
await BrowserTestUtils.withNewTab(outer, async browser => {
let inner = browser.browsingContext.children[0];
// Install a beforeunload event handler that resolves a promise.
await SpecialPowers.spawn(inner, [], () => {
let { promise, resolve } = Promise.withResolvers();
content.addEventListener(
"beforeunload",
e => {
e.preventDefault();
resolve();
},
{
once: true,
}
);
content.beforeunloadPromise = promise;
});
// Get the promise for the beforeunload handler so we can wait for it.
let beforeunloadFired = SpecialPowers.spawn(
browser.browsingContext.children[0],
[],
() => {
return content.beforeunloadPromise;
}
);
// Register whether a load has started.
let loaded = BrowserTestUtils.browserLoaded(browser).then(() => "loaded");
// This is rather fragile, but we need to make sure we don't start a
// speculative load in the parent so let's give it the time to be done.
let timeout = new Promise(resolve =>
// eslint-disable-next-line mozilla/no-arbitrary-setTimeout
setTimeout(() => resolve("timeout"), 3000)
);
// Need to add some user interaction for beforeunload.
await BrowserTestUtils.synthesizeMouse("body", 0, 0, {}, inner, true);
// Try to start a speculative load in the parent.
await beforeunloadFired;
is(
await Promise.race([loaded, timeout]),
"timeout",
"Timed out because the load was blocked by beforeunload."
);
});
});