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diff --git a/netwerk/test/unit/test_cookies_read.js b/netwerk/test/unit/test_cookies_read.js
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+++ b/netwerk/test/unit/test_cookies_read.js
@@ -0,0 +1,119 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// test cookie database asynchronous read operation.
+
+"use strict";
+
+var CMAX = 1000; // # of cookies to create
+
+add_task(async () => {
+  // Set up a profile.
+  let profile = do_get_profile();
+
+  // Allow all cookies.
+  Services.prefs.setIntPref("network.cookie.cookieBehavior", 0);
+  Services.prefs.setBoolPref(
+    "network.cookieJarSettings.unblocked_for_testing",
+    true
+  );
+
+  // Bug 1617611 - Fix all the tests broken by "cookies SameSite=Lax by default"
+  Services.prefs.setBoolPref("network.cookie.sameSite.laxByDefault", false);
+
+  // Start the cookieservice, to force creation of a database.
+  // Get the sessionCookies to join the initialization in cookie thread
+  Services.cookies.sessionCookies;
+
+  // Open a database connection now, after synchronous initialization has
+  // completed. We may not be able to open one later once asynchronous writing
+  // begins.
+  Assert.ok(do_get_cookie_file(profile).exists());
+  let db = new CookieDatabaseConnection(do_get_cookie_file(profile), 12);
+
+  let uri = NetUtil.newURI("http://foo.com/");
+  let channel = NetUtil.newChannel({
+    uri,
+    loadUsingSystemPrincipal: true,
+    contentPolicyType: Ci.nsIContentPolicy.TYPE_DOCUMENT,
+  });
+  for (let i = 0; i < CMAX; ++i) {
+    let uri = NetUtil.newURI("http://" + i + ".com/");
+    Services.cookies.setCookieStringFromHttp(
+      uri,
+      "oh=hai; max-age=1000",
+      channel
+    );
+  }
+
+  Assert.equal(do_count_cookies(), CMAX);
+
+  // Wait until all CMAX cookies have been written out to the database.
+  while (do_count_cookies_in_db(db.db) < CMAX) {
+    await new Promise(resolve => executeSoon(resolve));
+  }
+
+  // Check the WAL file size. We set it to 16 pages of 32k, which means it
+  // should be around 500k.
+  let file = db.db.databaseFile;
+  Assert.ok(file.exists());
+  Assert.ok(file.fileSize < 1e6);
+  db.close();
+
+  // fake a profile change
+  await promise_close_profile();
+  do_load_profile();
+
+  // test a few random cookies
+  Assert.equal(Services.cookies.countCookiesFromHost("999.com"), 1);
+  Assert.equal(Services.cookies.countCookiesFromHost("abc.com"), 0);
+  Assert.equal(Services.cookies.countCookiesFromHost("100.com"), 1);
+  Assert.equal(Services.cookies.countCookiesFromHost("400.com"), 1);
+  Assert.equal(Services.cookies.countCookiesFromHost("xyz.com"), 0);
+
+  // force synchronous load of everything
+  Assert.equal(do_count_cookies(), CMAX);
+
+  // check that everything's precisely correct
+  for (let i = 0; i < CMAX; ++i) {
+    let host = i.toString() + ".com";
+    Assert.equal(Services.cookies.countCookiesFromHost(host), 1);
+  }
+
+  // reload again, to make sure the additions were written correctly
+  await promise_close_profile();
+  do_load_profile();
+
+  // remove some of the cookies, in both reverse and forward order
+  for (let i = 100; i-- > 0; ) {
+    let host = i.toString() + ".com";
+    Services.cookies.remove(host, "oh", "/", {});
+  }
+  for (let i = CMAX - 100; i < CMAX; ++i) {
+    let host = i.toString() + ".com";
+    Services.cookies.remove(host, "oh", "/", {});
+  }
+
+  // check the count
+  Assert.equal(do_count_cookies(), CMAX - 200);
+
+  // reload again, to make sure the removals were written correctly
+  await promise_close_profile();
+  do_load_profile();
+
+  // check the count
+  Assert.equal(do_count_cookies(), CMAX - 200);
+
+  // reload again, but wait for async read completion
+  await promise_close_profile();
+  await promise_load_profile();
+
+  // check that everything's precisely correct
+  Assert.equal(do_count_cookies(), CMAX - 200);
+  for (let i = 100; i < CMAX - 100; ++i) {
+    let host = i.toString() + ".com";
+    Assert.equal(Services.cookies.countCookiesFromHost(host), 1);
+  }
+
+  Services.prefs.clearUserPref("network.cookie.sameSite.laxByDefault");
+});