diff -r 000000000000 -r 6474c204b198 xpcom/tests/unit/test_bug476919.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/tests/unit/test_bug476919.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,28 @@
+const Cc = Components.classes;
+const Ci = Components.interfaces;
+
+function run_test() {
+  // skip this test on Windows
+  var isWindows = ("@mozilla.org/windows-registry-key;1" in Components.classes);
+  if (!isWindows) {
+    var testDir = __LOCATION__.parent;
+    // create a test file, then symlink it, then check that we think it's a symlink
+    var targetFile = testDir.clone();
+    targetFile.append("target.txt");
+    if (!targetFile.exists())
+      targetFile.create(Ci.nsIFile.NORMAL_FILE_TYPE, 0644);
+
+    var link = testDir.clone();
+    link.append("link");
+    if (link.exists())
+      link.remove(false);
+
+    var ln = Cc["@mozilla.org/file/local;1"].createInstance(Ci.nsILocalFile);
+    ln.initWithPath("/bin/ln");
+    var process = Cc["@mozilla.org/process/util;1"].createInstance(Ci.nsIProcess);
+    process.init(ln);
+    var args = ["-s", targetFile.path, link.path];
+    process.run(true, args, args.length);
+    do_check_true(link.isSymlink());
+  }
+}