diff -r 000000000000 -r 6474c204b198 dom/fmradio/test/marionette/test_one_seek_at_once.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/fmradio/test/marionette/test_one_seek_at_once.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,73 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+MARIONETTE_TIMEOUT = 10000;
+
+SpecialPowers.addPermission("fmradio", true, document);
+
+let FMRadio = window.navigator.mozFMRadio;
+
+function verifyInitialState() {
+  log("Verifying initial state.");
+  ok(FMRadio);
+  is(FMRadio.enabled, false);
+  setUp();
+}
+
+function setUp() {
+  let frequency = FMRadio.frequencyLowerBound + FMRadio.channelWidth;
+  FMRadio.enable(frequency);
+  FMRadio.onenabled = seek;
+}
+
+function seek() {
+  var request = FMRadio.seekUp();
+  ok(request);
+
+  // There are two possibilities which depends on the system
+  // process scheduling (bug 911063 comment 0):
+  //   - the second seek fails
+  //   - both seeks are executed
+
+  request.onerror = function() {
+    ok(!firstSeekCompletes);
+    cleanUp();
+  };
+
+  var firstSeekCompletes = false;
+  request.onsuccess = function() {
+    firstSeekCompletes = true;
+  };
+
+  var seekAgainReq = FMRadio.seekUp();
+  ok(seekAgainReq);
+
+  seekAgainReq.onerror = function() {
+    log("Cancel the first seek to finish the test");
+    let cancelReq = FMRadio.cancelSeek();
+    ok(cancelReq);
+
+    // It's possible that the first seek completes when the
+    // cancel request is handled.
+    cancelReq.onerror = function() {
+      cleanUp();
+    };
+  };
+
+  seekAgainReq.onsuccess = function() {
+    ok(firstSeekCompletes);
+    cleanUp();
+  };
+}
+
+function cleanUp() {
+  FMRadio.disable();
+  FMRadio.ondisabled = function() {
+    FMRadio.ondisabled = null;
+    ok(!FMRadio.enabled);
+    finish();
+  };
+}
+
+verifyInitialState();
+