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diff --git a/comm/mailnews/imap/test/unit/test_autosync_date_constraints.js b/comm/mailnews/imap/test/unit/test_autosync_date_constraints.js
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+++ b/comm/mailnews/imap/test/unit/test_autosync_date_constraints.js
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * Test autosync date constraints
+ */
+
+var { MessageGenerator } = ChromeUtils.import(
+  "resource://testing-common/mailnews/MessageGenerator.jsm"
+);
+var { PromiseTestUtils } = ChromeUtils.import(
+  "resource://testing-common/mailnews/PromiseTestUtils.jsm"
+);
+
+var gMsgImapInboxFolder;
+
+// Adds some messages directly to a mailbox (eg new mail)
+function addMessagesToServer(messages, mailbox) {
+  // Create the ImapMessages and store them on the mailbox
+  messages.forEach(function (message) {
+    let dataUri = "data:text/plain," + message.toMessageString();
+    mailbox.addMessage(new ImapMessage(dataUri, mailbox.uidnext++, []));
+  });
+}
+
+add_setup(function () {
+  Services.prefs.setIntPref("mail.server.server1.autosync_max_age_days", 4);
+
+  setupIMAPPump();
+
+  gMsgImapInboxFolder = IMAPPump.inbox.QueryInterface(Ci.nsIMsgImapMailFolder);
+  // these hacks are required because we've created the inbox before
+  // running initial folder discovery, and adding the folder bails
+  // out before we set it as verified online, so we bail out, and
+  // then remove the INBOX folder since it's not verified.
+  gMsgImapInboxFolder.hierarchyDelimiter = "/";
+  gMsgImapInboxFolder.verifiedAsOnlineFolder = true;
+
+  // Add a couple of messages to the INBOX
+  // this is synchronous, afaik
+  let messageGenerator = new MessageGenerator();
+
+  // build up a diverse list of messages
+  let messages = [];
+  messages = messages.concat(
+    messageGenerator.makeMessage({ age: { days: 2, hours: 1 } })
+  );
+  messages = messages.concat(
+    messageGenerator.makeMessage({ age: { days: 8, hours: 1 } })
+  );
+  messages = messages.concat(
+    messageGenerator.makeMessage({ age: { days: 10, hours: 1 } })
+  );
+
+  addMessagesToServer(messages, IMAPPump.daemon.getMailbox("INBOX"));
+});
+
+add_task(async function downloadForOffline() {
+  // ...and download for offline use.
+  // This downloads all messages, ignoring the autosync age constraints.
+  let listener = new PromiseTestUtils.PromiseUrlListener();
+  IMAPPump.inbox.downloadAllForOffline(listener, null);
+  await listener.promise;
+});
+
+add_task(function test_applyRetentionSettings() {
+  IMAPPump.inbox.applyRetentionSettings();
+  let enumerator = IMAPPump.inbox.msgDatabase.enumerateMessages();
+  if (enumerator) {
+    let now = new Date();
+    let dateInSeconds = now.getSeconds();
+    let cutOffDateInSeconds = dateInSeconds - 5 * 60 * 24;
+    for (let header of enumerator) {
+      if (header instanceof Ci.nsIMsgDBHdr) {
+        if (header.dateInSeconds < cutOffDateInSeconds) {
+          Assert.equal(header.getStringProperty("pendingRemoval"), "1");
+        } else {
+          Assert.equal(header.getStringProperty("pendingRemoval"), "");
+        }
+      }
+    }
+  }
+});
+
+add_task(function endTest() {
+  teardownIMAPPump();
+});