diff -r 000000000000 -r 6474c204b198 toolkit/components/osfile/tests/xpcshell/test_osfile_closed.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/osfile/tests/xpcshell/test_osfile_closed.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,48 @@
+"use strict";
+
+Components.utils.import("resource://gre/modules/osfile.jsm");
+Components.utils.import("resource://gre/modules/Task.jsm");
+
+function run_test() {
+  do_test_pending();
+  run_next_test();
+}
+
+add_task(function test_closed() {
+  OS.Shared.DEBUG = true;
+  let currentDir = yield OS.File.getCurrentDirectory();
+  do_print("Open a file, ensure that we can call stat()");
+  let path = OS.Path.join(currentDir, "test_osfile_closed.js");
+  let file = yield OS.File.open(path);
+  yield file.stat();
+  do_check_true(true);
+
+  yield file.close();
+
+  do_print("Ensure that we cannot stat() on closed file");
+  let exn;
+  try {
+    yield file.stat();
+  } catch (ex) {
+    exn = ex;
+  }
+  do_print("Ensure that this raises the correct error");
+  do_check_true(!!exn);
+  do_check_true(exn instanceof OS.File.Error);
+  do_check_true(exn.becauseClosed);
+
+  do_print("Ensure that we cannot read() on closed file");
+  exn = null;
+  try {
+    yield file.read();
+  } catch (ex) {
+    exn = ex;
+  }
+  do_print("Ensure that this raises the correct error");
+  do_check_true(!!exn);
+  do_check_true(exn instanceof OS.File.Error);
+  do_check_true(exn.becauseClosed);
+
+});
+
+add_task(do_test_finished);