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diff --git a/netwerk/test/unit/test_stale-while-revalidate_positive.js b/netwerk/test/unit/test_stale-while-revalidate_positive.js
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+/*
+
+Tests the Cache-control: stale-while-revalidate response directive.
+
+Purpose is to check we perform the background revalidation when the window is set
+and we hit it.
+
+* Make request #1.
+ - response is from the server and version=1
+ - max-age=1, stale-while-revalidate=9999
+* Switch version of the data on the server and prolong the max-age to not let req #3
+ do a bck reval at the end of the test (prevent leaks/shutdown races.)
+* Make request #2 in 2 seconds (entry should be expired by that time, but fall into
+ the reval window.)
+ - response is from the cache, version=1
+ - a new background request should be made for the data
+* Wait for "http-on-background-revalidation" notifying finish of the background reval.
+* Make request #3.
+ - response is from the cache, version=2
+* Done.
+
+*/
+
+"use strict";
+
+const { HttpServer } = ChromeUtils.importESModule(
+ "resource://testing-common/httpd.sys.mjs"
+);
+
+let max_age;
+let version;
+let generate_response = ver => `response version=${ver}`;
+
+function test_handler(metadata, response) {
+ const originalBody = generate_response(version);
+ response.setHeader("Content-Type", "text/html", false);
+ response.setHeader(
+ "Cache-control",
+ `max-age=${max_age}, stale-while-revalidate=9999`,
+ false
+ );
+ response.setStatusLine(metadata.httpVersion, 200, "OK");
+ response.bodyOutputStream.write(originalBody, originalBody.length);
+}
+
+function make_channel(url) {
+ return NetUtil.newChannel({
+ uri: url,
+ loadUsingSystemPrincipal: true,
+ }).QueryInterface(Ci.nsIHttpChannel);
+}
+
+async function get_response(channel, fromCache) {
+ return new Promise(resolve => {
+ channel.asyncOpen(
+ new ChannelListener((request, buffer, ctx, isFromCache) => {
+ ok(fromCache == isFromCache, `got response from cache = ${fromCache}`);
+ resolve(buffer);
+ })
+ );
+ });
+}
+
+async function sleep(time) {
+ return new Promise(resolve => {
+ do_timeout(time * 1000, resolve);
+ });
+}
+
+async function stop_server(httpserver) {
+ return new Promise(resolve => {
+ httpserver.stop(resolve);
+ });
+}
+
+async function background_reval_promise() {
+ return new Promise(resolve => {
+ Services.obs.addObserver(resolve, "http-on-background-revalidation");
+ });
+}
+
+add_task(async function () {
+ let httpserver = new HttpServer();
+ httpserver.registerPathHandler("/testdir", test_handler);
+ httpserver.start(-1);
+ const PORT = httpserver.identity.primaryPort;
+ const URI = `http://localhost:${PORT}/testdir`;
+
+ let response;
+
+ version = 1;
+ max_age = 1;
+ response = await get_response(make_channel(URI), false);
+ ok(response == generate_response(1), "got response ver 1");
+
+ await sleep(max_age + 1);
+
+ // must specifically wait for the internal channel to finish the reval to make
+ // the test race-free.
+ let reval_done = background_reval_promise();
+
+ version = 2;
+ max_age = 100;
+ response = await get_response(make_channel(URI), true);
+ ok(response == generate_response(1), "got response ver 1");
+
+ await reval_done;
+
+ response = await get_response(make_channel(URI), true);
+ ok(response == generate_response(2), "got response ver 2");
+
+ await stop_server(httpserver);
+});