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diff --git a/comm/mailnews/base/test/unit/test_inheritedFolderProperties.js b/comm/mailnews/base/test/unit/test_inheritedFolderProperties.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/. */
+
+/*
+ * Testing of inherited folder properties
+ */
+
+function run_test() {
+  localAccountUtils.loadLocalMailAccount();
+  var rootFolder = localAccountUtils.incomingServer.rootMsgFolder;
+
+  // add subfolders to the inbox
+  const subFolder11 = localAccountUtils.inboxFolder
+    .createLocalSubfolder("subfolder11")
+    .QueryInterface(Ci.nsIMsgLocalMailFolder);
+  const subFolder12 = localAccountUtils.inboxFolder
+    .createLocalSubfolder("subfolder12")
+    .QueryInterface(Ci.nsIMsgLocalMailFolder);
+  const subFolder21 = subFolder11.createLocalSubfolder("subfolder21");
+  const subFolder22 = subFolder12.createLocalSubfolder("subfolder22");
+
+  // add a global preference
+  const propertyName = "iexist";
+  const invalidName = "idontexist";
+  const globalPref = "mail.server.default." + propertyName;
+  const globalValue = "iAmGlobal";
+  const folderValue = "iAmFolder";
+  const folderValue2 = "iAmFolder2";
+  const rootValue = "iAmRoot";
+  Services.prefs.setCharPref(globalPref, globalValue);
+
+  // test that the global preference is honored
+  Assert.equal(
+    rootFolder.getInheritedStringProperty(propertyName),
+    globalValue
+  );
+  Assert.equal(
+    subFolder11.getInheritedStringProperty(propertyName),
+    globalValue
+  );
+  Assert.equal(
+    subFolder22.getInheritedStringProperty(propertyName),
+    globalValue
+  );
+  Assert.equal(rootFolder.getInheritedStringProperty(invalidName), null);
+  Assert.equal(subFolder11.getInheritedStringProperty(invalidName), null);
+  Assert.equal(subFolder22.getInheritedStringProperty(invalidName), null);
+
+  // set a value on a subfolder and check
+  subFolder11.setStringProperty(propertyName, folderValue);
+  Assert.equal(
+    rootFolder.getInheritedStringProperty(propertyName),
+    globalValue
+  );
+  Assert.equal(
+    subFolder11.getInheritedStringProperty(propertyName),
+    folderValue
+  );
+  Assert.equal(
+    subFolder12.getInheritedStringProperty(propertyName),
+    globalValue
+  );
+  Assert.equal(
+    subFolder21.getInheritedStringProperty(propertyName),
+    folderValue
+  );
+  Assert.equal(
+    subFolder22.getInheritedStringProperty(propertyName),
+    globalValue
+  );
+
+  // set a root folder value and check
+  localAccountUtils.incomingServer.setCharValue(propertyName, rootValue);
+  Assert.equal(rootFolder.getInheritedStringProperty(propertyName), rootValue);
+  Assert.equal(
+    subFolder11.getInheritedStringProperty(propertyName),
+    folderValue
+  );
+  Assert.equal(subFolder12.getInheritedStringProperty(propertyName), rootValue);
+  Assert.equal(
+    subFolder21.getInheritedStringProperty(propertyName),
+    folderValue
+  );
+  Assert.equal(subFolder22.getInheritedStringProperty(propertyName), rootValue);
+
+  // force an empty string
+  subFolder12.setForcePropertyEmpty(propertyName, true);
+  Assert.equal(rootFolder.getInheritedStringProperty(propertyName), rootValue);
+  Assert.equal(
+    subFolder11.getInheritedStringProperty(propertyName),
+    folderValue
+  );
+  Assert.equal(subFolder12.getInheritedStringProperty(propertyName), "");
+  Assert.equal(
+    subFolder21.getInheritedStringProperty(propertyName),
+    folderValue
+  );
+  Assert.equal(subFolder22.getInheritedStringProperty(propertyName), "");
+
+  // reset a folder to allow inheritance
+  subFolder12.setForcePropertyEmpty(propertyName, false);
+  subFolder12.setStringProperty(propertyName, "");
+  Assert.equal(rootFolder.getInheritedStringProperty(propertyName), rootValue);
+  Assert.equal(
+    subFolder11.getInheritedStringProperty(propertyName),
+    folderValue
+  );
+  Assert.equal(subFolder12.getInheritedStringProperty(propertyName), rootValue);
+  Assert.equal(
+    subFolder21.getInheritedStringProperty(propertyName),
+    folderValue
+  );
+  Assert.equal(subFolder22.getInheritedStringProperty(propertyName), rootValue);
+
+  // force an empty string on the server
+  localAccountUtils.incomingServer.setForcePropertyEmpty(propertyName, true);
+  Assert.equal(rootFolder.getInheritedStringProperty(propertyName), "");
+  Assert.equal(
+    subFolder11.getInheritedStringProperty(propertyName),
+    folderValue
+  );
+  Assert.equal(subFolder12.getInheritedStringProperty(propertyName), "");
+  Assert.equal(
+    subFolder21.getInheritedStringProperty(propertyName),
+    folderValue
+  );
+  Assert.equal(subFolder22.getInheritedStringProperty(propertyName), "");
+
+  // reset a server to allow inheritance from the global
+  localAccountUtils.incomingServer.setCharValue(propertyName, "");
+  localAccountUtils.incomingServer.setForcePropertyEmpty(propertyName, false);
+  Assert.equal(
+    rootFolder.getInheritedStringProperty(propertyName),
+    globalValue
+  );
+  Assert.equal(
+    subFolder11.getInheritedStringProperty(propertyName),
+    folderValue
+  );
+  Assert.equal(
+    subFolder12.getInheritedStringProperty(propertyName),
+    globalValue
+  );
+  Assert.equal(
+    subFolder21.getInheritedStringProperty(propertyName),
+    folderValue
+  );
+  Assert.equal(
+    subFolder22.getInheritedStringProperty(propertyName),
+    globalValue
+  );
+
+  // check with all levels populated
+  subFolder21.setStringProperty(propertyName, folderValue2);
+  localAccountUtils.incomingServer.setCharValue(propertyName, rootValue);
+  Assert.equal(rootFolder.getInheritedStringProperty(propertyName), rootValue);
+  Assert.equal(
+    subFolder11.getInheritedStringProperty(propertyName),
+    folderValue
+  );
+  Assert.equal(subFolder12.getInheritedStringProperty(propertyName), rootValue);
+  Assert.equal(
+    subFolder21.getInheritedStringProperty(propertyName),
+    folderValue2
+  );
+  Assert.equal(subFolder22.getInheritedStringProperty(propertyName), rootValue);
+
+  // clear the global value and the root value
+  Services.prefs.clearUserPref(globalPref);
+  localAccountUtils.incomingServer.setCharValue(propertyName, "");
+  Assert.equal(rootFolder.getInheritedStringProperty(propertyName), null);
+  Assert.equal(
+    subFolder11.getInheritedStringProperty(propertyName),
+    folderValue
+  );
+  Assert.equal(subFolder12.getInheritedStringProperty(propertyName), null);
+  Assert.equal(
+    subFolder21.getInheritedStringProperty(propertyName),
+    folderValue2
+  );
+  Assert.equal(subFolder22.getInheritedStringProperty(propertyName), null);
+}