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diff --git a/netwerk/test/unit/test_schema_2_migration.js b/netwerk/test/unit/test_schema_2_migration.js
new file mode 100644
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+++ b/netwerk/test/unit/test_schema_2_migration.js
@@ -0,0 +1,303 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Test cookie database migration from version 2 (Gecko 1.9.3) to the current
+// version, presently 4 (Gecko 2.0).
+"use strict";
+
+var test_generator = do_run_test();
+
+function run_test() {
+  do_test_pending();
+  test_generator.next();
+}
+
+function finish_test() {
+  executeSoon(function() {
+    test_generator.return();
+    do_test_finished();
+  });
+}
+
+function* do_run_test() {
+  // Set up a profile.
+  let profile = do_get_profile();
+
+  // Start the cookieservice, to force creation of a database.
+  // Get the sessionCookies to join the initialization in cookie thread
+  Services.cookies.sessionCookies;
+
+  // Close the profile.
+  do_close_profile(test_generator);
+  yield;
+
+  // Remove the cookie file in order to create another database file.
+  do_get_cookie_file(profile).remove(false);
+
+  // Create a schema 2 database.
+  let schema2db = new CookieDatabaseConnection(do_get_cookie_file(profile), 2);
+
+  let now = Date.now() * 1000;
+  let futureExpiry = Math.round(now / 1e6 + 1000);
+  let pastExpiry = Math.round(now / 1e6 - 1000);
+
+  // Populate it, with:
+  // 1) Unexpired, unique cookies.
+  for (let i = 0; i < 20; ++i) {
+    let cookie = new Cookie(
+      "oh" + i,
+      "hai",
+      "foo.com",
+      "/",
+      futureExpiry,
+      now,
+      now + i,
+      false,
+      false,
+      false
+    );
+
+    schema2db.insertCookie(cookie);
+  }
+
+  // 2) Expired, unique cookies.
+  for (let i = 20; i < 40; ++i) {
+    let cookie = new Cookie(
+      "oh" + i,
+      "hai",
+      "bar.com",
+      "/",
+      pastExpiry,
+      now,
+      now + i,
+      false,
+      false,
+      false
+    );
+
+    schema2db.insertCookie(cookie);
+  }
+
+  // 3) Many copies of the same cookie, some of which have expired and
+  // some of which have not.
+  for (let i = 40; i < 45; ++i) {
+    let cookie = new Cookie(
+      "oh",
+      "hai",
+      "baz.com",
+      "/",
+      futureExpiry + i,
+      now,
+      now + i,
+      false,
+      false,
+      false
+    );
+
+    schema2db.insertCookie(cookie);
+  }
+  for (let i = 45; i < 50; ++i) {
+    let cookie = new Cookie(
+      "oh",
+      "hai",
+      "baz.com",
+      "/",
+      pastExpiry - i,
+      now,
+      now + i,
+      false,
+      false,
+      false
+    );
+
+    schema2db.insertCookie(cookie);
+  }
+  for (let i = 50; i < 55; ++i) {
+    let cookie = new Cookie(
+      "oh",
+      "hai",
+      "baz.com",
+      "/",
+      futureExpiry - i,
+      now,
+      now + i,
+      false,
+      false,
+      false
+    );
+
+    schema2db.insertCookie(cookie);
+  }
+  for (let i = 55; i < 60; ++i) {
+    let cookie = new Cookie(
+      "oh",
+      "hai",
+      "baz.com",
+      "/",
+      pastExpiry + i,
+      now,
+      now + i,
+      false,
+      false,
+      false
+    );
+
+    schema2db.insertCookie(cookie);
+  }
+
+  // Close it.
+  schema2db.close();
+  schema2db = null;
+
+  // Load the database, forcing migration to the current schema version. Then
+  // test the expected set of cookies:
+  do_load_profile();
+
+  // 1) All unexpired, unique cookies exist.
+  Assert.equal(Services.cookies.countCookiesFromHost("foo.com"), 20);
+
+  // 2) All expired, unique cookies exist.
+  Assert.equal(Services.cookies.countCookiesFromHost("bar.com"), 20);
+
+  // 3) Only one cookie remains, and it's the one with the highest expiration
+  // time.
+  Assert.equal(Services.cookies.countCookiesFromHost("baz.com"), 1);
+  let cookies = Services.cookies.getCookiesFromHost("baz.com", {});
+  let cookie = cookies[0];
+  Assert.equal(cookie.expiry, futureExpiry + 44);
+
+  do_close_profile(test_generator);
+  yield;
+
+  // Open the database so we can execute some more schema 2 statements on it.
+  schema2db = new CookieDatabaseConnection(do_get_cookie_file(profile), 2);
+
+  // Populate it with more cookies.
+  for (let i = 60; i < 80; ++i) {
+    let cookie = new Cookie(
+      "oh" + i,
+      "hai",
+      "foo.com",
+      "/",
+      futureExpiry,
+      now,
+      now + i,
+      false,
+      false,
+      false
+    );
+
+    schema2db.insertCookie(cookie);
+  }
+  for (let i = 80; i < 100; ++i) {
+    let cookie = new Cookie(
+      "oh" + i,
+      "hai",
+      "cat.com",
+      "/",
+      futureExpiry,
+      now,
+      now + i,
+      false,
+      false,
+      false
+    );
+
+    schema2db.insertCookie(cookie);
+  }
+
+  // Attempt to add a cookie with the same (name, host, path) values as another
+  // cookie. This should succeed since we have a REPLACE clause for conflict on
+  // the unique index.
+  cookie = new Cookie(
+    "oh",
+    "hai",
+    "baz.com",
+    "/",
+    futureExpiry,
+    now,
+    now + 100,
+    false,
+    false,
+    false
+  );
+
+  schema2db.insertCookie(cookie);
+
+  // Check that there is, indeed, a singular cookie for baz.com.
+  Assert.equal(do_count_cookies_in_db(schema2db.db, "baz.com"), 1);
+
+  // Close it.
+  schema2db.close();
+  schema2db = null;
+
+  // Back up the database, so we can test both asynchronous and synchronous
+  // loading separately.
+  let file = do_get_cookie_file(profile);
+  let copy = profile.clone();
+  copy.append("cookies.sqlite.copy");
+  file.copyTo(null, copy.leafName);
+
+  // Load the database asynchronously, forcing a purge of the newly-added
+  // cookies. (Their baseDomain column will be NULL.)
+  do_load_profile(test_generator);
+  yield;
+
+  // Test the expected set of cookies.
+  Assert.equal(Services.cookies.countCookiesFromHost("foo.com"), 40);
+  Assert.equal(Services.cookies.countCookiesFromHost("bar.com"), 20);
+  Assert.equal(Services.cookies.countCookiesFromHost("baz.com"), 1);
+  Assert.equal(Services.cookies.countCookiesFromHost("cat.com"), 20);
+
+  do_close_profile(test_generator);
+  yield;
+
+  // Copy the database back.
+  file.remove(false);
+  copy.copyTo(null, file.leafName);
+
+  // Load the database host-at-a-time.
+  do_load_profile();
+
+  // Test the expected set of cookies.
+  Assert.equal(Services.cookies.countCookiesFromHost("foo.com"), 40);
+  Assert.equal(Services.cookies.countCookiesFromHost("bar.com"), 20);
+  Assert.equal(Services.cookies.countCookiesFromHost("baz.com"), 1);
+  Assert.equal(Services.cookies.countCookiesFromHost("cat.com"), 20);
+
+  do_close_profile(test_generator);
+  yield;
+
+  // Open the database and prove that they were deleted.
+  schema2db = new CookieDatabaseConnection(do_get_cookie_file(profile), 2);
+  Assert.equal(do_count_cookies_in_db(schema2db.db), 81);
+  Assert.equal(do_count_cookies_in_db(schema2db.db, "foo.com"), 40);
+  Assert.equal(do_count_cookies_in_db(schema2db.db, "bar.com"), 20);
+  schema2db.close();
+
+  // Copy the database back.
+  file.remove(false);
+  copy.copyTo(null, file.leafName);
+
+  // Load the database synchronously, in its entirety.
+  do_load_profile();
+  Assert.equal(do_count_cookies(), 81);
+
+  // Test the expected set of cookies.
+  Assert.equal(Services.cookies.countCookiesFromHost("foo.com"), 40);
+  Assert.equal(Services.cookies.countCookiesFromHost("bar.com"), 20);
+  Assert.equal(Services.cookies.countCookiesFromHost("baz.com"), 1);
+  Assert.equal(Services.cookies.countCookiesFromHost("cat.com"), 20);
+
+  do_close_profile(test_generator);
+  yield;
+
+  // Open the database and prove that they were deleted.
+  schema2db = new CookieDatabaseConnection(do_get_cookie_file(profile), 2);
+  Assert.equal(do_count_cookies_in_db(schema2db.db), 81);
+  Assert.equal(do_count_cookies_in_db(schema2db.db, "foo.com"), 40);
+  Assert.equal(do_count_cookies_in_db(schema2db.db, "bar.com"), 20);
+  schema2db.close();
+
+  finish_test();
+}