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diff --git a/comm/mailnews/base/test/unit/test_imapPump.js b/comm/mailnews/base/test/unit/test_imapPump.js
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+++ b/comm/mailnews/base/test/unit/test_imapPump.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/. */
+
+/**
+ * Simple demonstration of the imap pump test method.
+ */
+
+// async support
+/* import-globals-from ../../../test/resources/logHelper.js */
+load("../../../resources/logHelper.js");
+const { PromiseTestUtils } = ChromeUtils.import(
+  "resource://testing-common/mailnews/PromiseTestUtils.jsm"
+);
+
+// IMAP pump
+var { IMAPPump, setupIMAPPump, teardownIMAPPump } = ChromeUtils.import(
+  "resource://testing-common/mailnews/IMAPpump.jsm"
+);
+var { ImapMessage } = ChromeUtils.import(
+  "resource://testing-common/mailnews/Imapd.jsm"
+);
+
+var { fsDebugAll } = ChromeUtils.import(
+  "resource://testing-common/mailnews/Maild.jsm"
+);
+
+// Globals
+
+// Messages to load must have CRLF line endings, that is Windows style
+var gMessage = "bugmail10"; // message file used as the test message
+
+// Definition of tests
+
+// load and update a message in the imap fake server
+
+var gTestArray = [
+  // initial setup of IMAP environment
+  setupIMAPPump,
+
+  // optionally set server parameters, here enabling debug messages
+  function serverParms() {
+    IMAPPump.server.setDebugLevel(fsDebugAll);
+  },
+
+  // the main test
+  async function loadImapMessage() {
+    IMAPPump.mailbox.addMessage(
+      new ImapMessage(specForFileName(gMessage), IMAPPump.mailbox.uidnext++, [])
+    );
+    let promiseUrlListener = new PromiseTestUtils.PromiseUrlListener();
+    IMAPPump.inbox.updateFolderWithListener(null, promiseUrlListener);
+    await promiseUrlListener.promise;
+
+    Assert.equal(1, IMAPPump.inbox.getTotalMessages(false));
+    let msgHdr = mailTestUtils.firstMsgHdr(IMAPPump.inbox);
+    Assert.ok(msgHdr instanceof Ci.nsIMsgDBHdr);
+  },
+
+  // all done
+  teardownIMAPPump,
+];
+
+add_setup(() => {
+  Services.prefs.setBoolPref(
+    "mail.server.default.autosync_offline_stores",
+    false
+  );
+  gTestArray.forEach(x => add_task(x));
+});
+
+/*
+ * helper functions
+ */
+
+// given a test file, return the file uri spec
+function specForFileName(aFileName) {
+  let file = do_get_file(gDEPTH + "mailnews/data/" + aFileName);
+  let msgfileuri = Services.io.newFileURI(file).QueryInterface(Ci.nsIFileURL);
+  return msgfileuri.spec;
+}