mozilla-central/toolkit/components/extensions/test/xpcshell/test_ext_contentscript_unregister_during_loadContentScript.js (file symbol)

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Test Info: Warnings

/* Any copyright is dedicated to the Public Domain.
"use strict";
const server = createHttpServer();
server.registerDirectory("/data/", do_get_file("data"));
const BASE_URL = `http://localhost:${server.identity.primaryPort}/data`;
add_task(async function content_script_unregistered_during_loadContentScript() {
let content_scripts = [];
for (let i = 0; i < 10; i++) {
content_scripts.push({
matches: ["<all_urls>"],
js: ["dummy.js"],
run_at: "document_start",
});
}
let extension = ExtensionTestUtils.loadExtension({
manifest: {
content_scripts,
},
files: {
"dummy.js": function () {
browser.test.sendMessage("content-script-executed");
},
},
});
await extension.startup();
let contentPage = await ExtensionTestUtils.loadContentPage(
`${BASE_URL}/file_sample.html`
);
info("Wait for all the content scripts to be executed");
await Promise.all(
content_scripts.map(() => extension.awaitMessage("content-script-executed"))
);
const promiseDone = contentPage.legacySpawn([extension.id], extensionId => {
const { ExtensionProcessScript } = ChromeUtils.importESModule(
"resource://gre/modules/ExtensionProcessScript.sys.mjs"
);
return new Promise(resolve => {
// This recreates a scenario similar to Bug 1593240 and ensures that the
// related fix doesn't regress. Replacing loadContentScript with a
// function that unregisters all the content scripts make us sure that
// mutating the policy contentScripts doesn't trigger a crash due to
// the invalidation of the contentScripts iterator being used by the
// caller (ExtensionPolicyService::CheckContentScripts).
const { loadContentScript } = ExtensionProcessScript;
ExtensionProcessScript.loadContentScript = async (...args) => {
const policy = WebExtensionPolicy.getByID(extensionId);
let initial = policy.contentScripts.length;
let i = initial;
while (i) {
policy.unregisterContentScript(policy.contentScripts[--i]);
}
Services.tm.dispatchToMainThread(() =>
resolve({
initial,
final: policy.contentScripts.length,
})
);
// Call the real loadContentScript method.
return loadContentScript(...args);
};
});
});
info("Reload the webpage");
await contentPage.loadURL(`${BASE_URL}/file_sample.html`);
info("Wait for all the content scripts to be executed again");
await Promise.all(
content_scripts.map(() => extension.awaitMessage("content-script-executed"))
);
info("No crash triggered as expected");
Assert.deepEqual(
await promiseDone,
{ initial: content_scripts.length, final: 0 },
"All content scripts unregistered as expected"
);
await contentPage.close();
await extension.unload();
});