diff -r 000000000000 -r 6474c204b198 dom/nfc/tests/marionette/head.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/nfc/tests/marionette/head.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,86 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+let pendingEmulatorCmdCount = 0;
+
+SpecialPowers.addPermission("nfc-manager", true, document);
+
+/**
+ * Emulator helper.
+ */
+let emulator = (function() {
+  let pendingCmdCount = 0;
+  let originalRunEmulatorCmd = runEmulatorCmd;
+
+  // Overwritten it so people could not call this function directly.
+  runEmulatorCmd = function() {
+    throw "Use emulator.run(cmd, callback) instead of runEmulatorCmd";
+  };
+
+  function run(cmd, callback) {
+    pendingCmdCount++;
+    originalRunEmulatorCmd(cmd, function(result) {
+      pendingCmdCount--;
+      if (callback && typeof callback === "function") {
+        callback(result);
+      }
+    });
+  }
+
+  return {
+    run: run
+  };
+}());
+
+function toggleNFC(enabled, callback) {
+  isnot(callback, null);
+
+  let nfc = window.navigator.mozNfc;
+  let req;
+  if (enabled) {
+    req = nfc.startPoll();
+  } else {
+    req = nfc.powerOff();
+  }
+
+  req.onsuccess = function() {
+    callback();
+  };
+
+  req.onerror = function() {
+    ok(false, 'operation failed, error ' + req.error.name);
+    finish();
+  };
+}
+
+function cleanUp() {
+  log('Cleaning up');
+  waitFor(function() {
+            SpecialPowers.removePermission("nfc-manager", document);
+            finish()
+          },
+          function() {
+            return pendingEmulatorCmdCount === 0;
+          });
+}
+
+function runNextTest() {
+  let test = tests.shift();
+  if (!test) {
+    cleanUp();
+    return;
+  }
+  test();
+}
+
+// run this function to start tests
+function runTests() {
+  if ('mozNfc' in window.navigator) {
+    runNextTest();
+  } else {
+    // succeed immediately on systems without NFC
+    log('Skipping test on system without NFC');
+    ok(true, 'Skipping test on system without NFC');
+    finish();
+  }
+}