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diff --git a/comm/mailnews/base/test/unit/test_nsMsgMailSession_Listeners.js b/comm/mailnews/base/test/unit/test_nsMsgMailSession_Listeners.js
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+++ b/comm/mailnews/base/test/unit/test_nsMsgMailSession_Listeners.js
@@ -0,0 +1,161 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/*
+ * Test suite for nsMsgMailSession functions relating to listeners.
+ */
+
+var { MailServices } = ChromeUtils.import(
+  "resource:///modules/MailServices.jsm"
+);
+
+var numListenerFunctions = 8;
+
+// The MailSession also implements nsIFolderListener - used to relay
+// notifications onward to all the registered listeners.
+var gMailSessionNotifier = MailServices.mailSession.QueryInterface(
+  Ci.nsIFolderListener
+);
+
+var gFLAll;
+var gFLSingle = new Array(numListenerFunctions);
+
+function fL() {}
+
+fL.prototype = {
+  mReceived: 0,
+  mAutoRemoveItem: false,
+
+  onFolderAdded(parentFolder, child) {
+    this.mReceived |= Ci.nsIFolderListener.added;
+    if (this.mAutoRemoveItem) {
+      MailServices.mailSession.RemoveFolderListener(this);
+    }
+  },
+  onMessageAdded(parentFolder, msg) {
+    this.mReceived |= Ci.nsIFolderListener.added;
+    if (this.mAutoRemoveItem) {
+      MailServices.mailSession.RemoveFolderListener(this);
+    }
+  },
+  onFolderRemoved(parentFolder, child) {
+    this.mReceived |= Ci.nsIFolderListener.removed;
+    if (this.mAutoRemoveItem) {
+      MailServices.mailSession.RemoveFolderListener(this);
+    }
+  },
+  onMessageRemoved(parentFolder, msg) {
+    this.mReceived |= Ci.nsIFolderListener.removed;
+    if (this.mAutoRemoveItem) {
+      MailServices.mailSession.RemoveFolderListener(this);
+    }
+  },
+  onFolderPropertyChanged(item, property, oldValue, newValue) {
+    this.mReceived |= Ci.nsIFolderListener.propertyChanged;
+    if (this.mAutoRemoveItem) {
+      MailServices.mailSession.RemoveFolderListener(this);
+    }
+  },
+  onFolderIntPropertyChanged(item, property, oldValue, newValue) {
+    this.mReceived |= Ci.nsIFolderListener.intPropertyChanged;
+    if (this.mAutoRemoveItem) {
+      MailServices.mailSession.RemoveFolderListener(this);
+    }
+  },
+  onFolderBoolPropertyChanged(item, property, oldValue, newValue) {
+    this.mReceived |= Ci.nsIFolderListener.boolPropertyChanged;
+    if (this.mAutoRemoveItem) {
+      MailServices.mailSession.RemoveFolderListener(this);
+    }
+  },
+  onFolderUnicharPropertyChanged(item, property, oldValue, newValue) {
+    this.mReceived |= Ci.nsIFolderListener.unicharPropertyChanged;
+    if (this.mAutoRemoveItem) {
+      MailServices.mailSession.RemoveFolderListener(this);
+    }
+  },
+  onFolderPropertyFlagChanged(item, property, oldValue, newValue) {
+    this.mReceived |= Ci.nsIFolderListener.propertyFlagChanged;
+    if (this.mAutoRemoveItem) {
+      MailServices.mailSession.RemoveFolderListener(this);
+    }
+  },
+  onFolderEvent(parentItem, item) {
+    this.mReceived |= Ci.nsIFolderListener.event;
+    if (this.mAutoRemoveItem) {
+      MailServices.mailSession.RemoveFolderListener(this);
+    }
+  },
+};
+
+function NotifyMailSession() {
+  gMailSessionNotifier.onFolderAdded(null, null);
+  gMailSessionNotifier.onMessageAdded(null, null);
+  gMailSessionNotifier.onFolderRemoved(null, null);
+  gMailSessionNotifier.onMessageRemoved(null, null);
+  gMailSessionNotifier.onFolderPropertyChanged(null, null, null, null);
+  gMailSessionNotifier.onFolderIntPropertyChanged(null, null, null, null);
+  gMailSessionNotifier.onFolderBoolPropertyChanged(null, null, null, null);
+  gMailSessionNotifier.onFolderUnicharPropertyChanged(null, null, null, null);
+  gMailSessionNotifier.onFolderPropertyFlagChanged(null, null, null, null);
+  gMailSessionNotifier.onFolderEvent(null, null);
+}
+
+function run_test() {
+  var i;
+
+  Assert.ok(MailServices.mailSession != null);
+
+  // Test - Add a listener
+
+  gFLAll = new fL();
+
+  MailServices.mailSession.AddFolderListener(gFLAll, Ci.nsIFolderListener.all);
+
+  for (i = 0; i < numListenerFunctions; ++i) {
+    gFLSingle[i] = new fL();
+    MailServices.mailSession.AddFolderListener(gFLSingle[i], Math.pow(2, i));
+  }
+
+  // Test - Notify listener on all available items
+
+  NotifyMailSession();
+
+  Assert.equal(gFLAll.mReceived, Math.pow(2, numListenerFunctions) - 1);
+  gFLAll.mReceived = 0;
+
+  for (i = 0; i < numListenerFunctions; ++i) {
+    Assert.equal(gFLSingle[i].mReceived, Math.pow(2, i));
+    gFLSingle[i].mReceived = 0;
+
+    // And prepare for test 3.
+    gFLSingle[i].mAutoRemoveItem = true;
+  }
+
+  // Test - Remove Single Listeners as we go through the functions
+
+  // Check the for loop above for changes to the single listeners.
+
+  NotifyMailSession();
+
+  Assert.equal(gFLAll.mReceived, Math.pow(2, numListenerFunctions) - 1);
+  gFLAll.mReceived = 0;
+
+  for (i = 0; i < numListenerFunctions; ++i) {
+    Assert.equal(gFLSingle[i].mReceived, Math.pow(2, i));
+    gFLSingle[i].mReceived = 0;
+  }
+
+  // Test - Ensure the single listeners have been removed.
+
+  NotifyMailSession();
+
+  Assert.equal(gFLAll.mReceived, Math.pow(2, numListenerFunctions) - 1);
+  gFLAll.mReceived = 0;
+
+  for (i = 0; i < numListenerFunctions; ++i) {
+    Assert.equal(gFLSingle[i].mReceived, 0);
+  }
+
+  // Test - Remove main listener
+
+  MailServices.mailSession.RemoveFolderListener(gFLAll);
+}