1 files changed, 64 insertions, 0 deletions
diff --git a/comm/mailnews/local/test/unit/test_noTop.js b/comm/mailnews/local/test/unit/test_noTop.js
new file mode 100644
index 0000000000..a30a03c060
--- /dev/null
+++ b/comm/mailnews/local/test/unit/test_noTop.js
@@ -0,0 +1,64 @@
+/* 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/. */
+
+var { PromiseTestUtils } = ChromeUtils.import(
+  "resource://testing-common/mailnews/PromiseTestUtils.jsm"
+);
+
+/**
+ * A handler with no TOP support.
+ */
+class NoTopHandler extends POP3_RFC1939_handler {
+  TOP() {
+    return this.onError("TOP");
+  }
+}
+
+let daemon = new Pop3Daemon();
+let server = new nsMailServer(d => {
+  let handler = new NoTopHandler(d);
+  return handler;
+}, daemon);
+server.start();
+registerCleanupFunction(() => {
+  server.stop();
+});
+
+/**
+ * Inject a message to the server and do a GetNewMail for the incomingServer.
+ *
+ * @param {nsIPop3IncomingServer} incomingServer
+ */
+async function getNewMail(incomingServer) {
+  daemon.setMessages(["message1.eml"]);
+
+  let urlListener = new PromiseTestUtils.PromiseUrlListener();
+  MailServices.pop3.GetNewMail(
+    null,
+    urlListener,
+    localAccountUtils.inboxFolder,
+    incomingServer
+  );
+  return urlListener.promise;
+}
+
+/**
+ * Test TOP is sent even if not advertised, and fallback to RETR after failed.
+ */
+add_task(async function testNoTop() {
+  let incomingServer = createPop3ServerAndLocalFolders(server.port);
+  incomingServer.headersOnly = true;
+  await getNewMail(incomingServer);
+  do_check_transaction(server.playTransaction(), [
+    "CAPA",
+    "USER fred",
+    "PASS wilma",
+    "STAT",
+    "LIST",
+    "UIDL",
+    "TOP 1 0",
+    "RETR 1",
+    "DELE 1",
+  ]);
+});