1 files changed, 42 insertions, 0 deletions
diff --git a/comm/mailnews/news/test/unit/test_xover.js b/comm/mailnews/news/test/unit/test_xover.js
new file mode 100644
index 0000000000..48cc6f3e50
--- /dev/null
+++ b/comm/mailnews/news/test/unit/test_xover.js
@@ -0,0 +1,42 @@
+/* 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/. */
+
+let daemon = setupNNTPDaemon();
+let server = makeServer(NNTP_RFC2980_handler, daemon);
+server.start();
+registerCleanupFunction(() => {
+  server.stop();
+});
+
+let incomingServer = setupLocalServer(server.port);
+
+/**
+ * Test nsIDBFolderInfo.knownArtsSet is correctly updated after XOVER response.
+ * knownArtsSet depends on the XOVER range requested, it doesn't matter if
+ * articles in that range don't exist on the server.
+ */
+add_task(function test_updateKnownKeySetAfterXOver() {
+  // setupNNTPDaemon inited test.filter with 8 messages, delete the 5th, 6th here.
+  daemon.removeArticleFromGroup("test.filter", 5);
+  daemon.removeArticleFromGroup("test.filter", 6);
+
+  // Trigger a get new messages request.
+  let prefix = "news://localhost:" + server.port + "/";
+  setupProtocolTest(server.port, prefix + "test.filter", incomingServer);
+  server.performTest();
+  let transaction = server.playTransaction();
+
+  // Test XOVER was sent correctly.
+  do_check_transaction(transaction, [
+    "MODE READER",
+    "GROUP test.filter",
+    "XOVER 1-8",
+  ]);
+
+  // Test knownArtsSet was updated correctly.
+  let folder = incomingServer.rootFolder.getChildNamed("test.filter");
+  let groupInfo = folder.msgDatabase.dBFolderInfo;
+  // knownArtsSet should be "1-8", not "1-4,7-8".
+  equal(groupInfo.knownArtsSet, "1-8");
+});