gecko-dev/xpcom/tests/unit/test_bug476919.js

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());
  }
}