diff -r 000000000000 -r 6474c204b198 dom/mobileconnection/tests/marionette/test_mobile_data_state.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/mobileconnection/tests/marionette/test_mobile_data_state.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,142 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+MARIONETTE_TIMEOUT = 60000;
+MARIONETTE_HEAD_JS = "head.js";
+
+const INITIAL_STATES = {
+  state: "registered",
+  connected: false,
+  emergencyCallsOnly: false,
+  roaming: false,
+  signalStrength: -99,
+  relSignalStrength: 44,
+
+  cell: {
+    gsmLocationAreaCode: 65535,
+    gsmCellId: 268435455,
+    cdmaBaseStationId: -1,
+    cdmaBaseStationLatitude: -2147483648,
+    cdmaBaseStationLongitude: -2147483648,
+    cdmaSystemId: -1,
+    cdmaNetworkId: -1,
+  }
+};
+
+const TEST_DATA = [{
+    // Test state becomes to "unregistered"
+    state: "unregistered",
+    expected: {
+      state: "notSearching",
+      connected: false,
+      emergencyCallsOnly: true,
+      roaming: false,
+      signalStrength: null,
+      relSignalStrength: null,
+      cell: null
+    }
+  }, {
+    // Test state becomes to "searching"
+    state: "searching",
+    expected: {
+      state: "searching",
+      connected: false,
+      emergencyCallsOnly: true,
+      roaming: false,
+      signalStrength: null,
+      relSignalStrength: null,
+      cell: null
+    }
+  }, {
+    // Test state becomes to "denied"
+    state: "denied",
+    expected: {
+      state: "denied",
+      connected: false,
+      emergencyCallsOnly: true,
+      roaming: false,
+      signalStrength: null,
+      relSignalStrength: null,
+      cell: null
+    }
+  }, {
+    // Test state becomes to "roaming"
+    // Set emulator's data state to "roaming" won't change the operator's
+    // long_name/short_name/mcc/mnc, so that the |data.roaming| will still
+    // report false. Please see bug 787967.
+    state: "roaming",
+    expected: {
+      state: "registered",
+      connected: false,
+      emergencyCallsOnly: false,
+      roaming: false,
+      signalStrength: -99,
+      relSignalStrength: 44,
+      cell: {
+        gsmLocationAreaCode: 65535,
+        gsmCellId: 268435455
+      }
+    }
+  }, {
+    // Reset state to default value.
+    state: "home",
+    expected: {
+      state: "registered",
+      connected: false,
+      emergencyCallsOnly: false,
+      roaming: false,
+      signalStrength: -99,
+      relSignalStrength: 44,
+      cell: {
+        gsmLocationAreaCode: 65535,
+        gsmCellId: 268435455
+      }
+    }
+  }
+];
+
+function compareTo(aPrefix, aFrom, aTo) {
+  for (let field in aTo) {
+    let fullName = aPrefix + field;
+
+    let lhs = aFrom[field];
+    let rhs = aTo[field];
+    ok(true, "lhs=" + JSON.stringify(lhs) + ", rhs=" + JSON.stringify(rhs));
+    if (typeof rhs !== "object") {
+      is(lhs, rhs, fullName);
+    } else if (rhs) {
+      ok(lhs, fullName);
+      compareTo(fullName + ".", lhs, rhs);
+    } else {
+      is(lhs, null, fullName);
+    }
+  }
+}
+
+function verifyDataInfo(aExpected) {
+  compareTo("data.", mobileConnection.data, aExpected);
+}
+
+/* Test Data State Changed */
+function testDataStateUpdate(aNewState, aExpected) {
+  log("Test data info with state='" + aNewState + "'");
+
+  // Set emulator's lac/cid and wait for 'ondatachange' event.
+  return setEmulatorVoiceDataStateAndWait("data", aNewState)
+    .then(() => verifyDataInfo(aExpected));
+}
+
+startTestCommon(function() {
+  log("Test initial data connection info");
+
+  verifyDataInfo(INITIAL_STATES);
+
+  let promise = Promise.resolve();
+  for (let i = 0; i < TEST_DATA.length; i++) {
+    let entry = TEST_DATA[i];
+    promise =
+      promise.then(testDataStateUpdate.bind(null, entry.state, entry.expected));
+  }
+
+  return promise;
+});