diff --git a/MyTracksTest/src/com/google/android/apps/mytracks/endtoendtest/EndToEndTestUtils.java b/MyTracksTest/src/com/google/android/apps/mytracks/endtoendtest/EndToEndTestUtils.java
index 4efe388f7..3c082afc2 100644
--- a/MyTracksTest/src/com/google/android/apps/mytracks/endtoendtest/EndToEndTestUtils.java
+++ b/MyTracksTest/src/com/google/android/apps/mytracks/endtoendtest/EndToEndTestUtils.java
@@ -94,6 +94,11 @@ public class EndToEndTestUtils {
   public static int LONG_WAIT_TIME = 15000;
   public static int SUPER_LONG_WAIT_TIME = 100000;
   
+  /**
+   * During debug, sets it to false to make debug is more efficient.
+   */
+  public static boolean clearEnvironment = true;
+  
   public static String deviceLanguage = "";
   
   static {
@@ -256,21 +261,23 @@ public class EndToEndTestUtils {
       hasActionBar = setHasActionBar();
       checkLanguage();
       isCheckedFirstLaunch = true;
-      deleteAllTracks();
-      resetAllSettings(activityMyTracks, false);
+      if (clearEnvironment) {
+        deleteAllTracks();
+        resetAllSettings(activityMyTracks, false);
       
-      instrumentation.waitForIdleSync();
-      // Check the status of real phone. For emulator, we would fix GPS signal.
-      if(!isEmulator) {
-        GoToMyLocationTest.findAndClickMyLocation(activityMyTracks);
-        hasGpsSingal = !SOLO.waitForText(NO_GPS_MESSAGE_PREFIX, 1,
-            EndToEndTestUtils.SHORT_WAIT_TIME);
-        SOLO.goBack();
+        instrumentation.waitForIdleSync();
+        // Check the status of real phone. For emulator, we would fix GPS signal.
+        if(!isEmulator) {
+          GoToMyLocationTest.findAndClickMyLocation(activityMyTracks);
+          hasGpsSingal = !SOLO.waitForText(NO_GPS_MESSAGE_PREFIX, 1,
+              EndToEndTestUtils.SHORT_WAIT_TIME);
+          SOLO.goBack();
+        }
+      } else if (SOLO.waitForText(
+          // After reset setting, welcome page will show again.
+          activityMytracks.getString(R.string.welcome_title), 0, SHORT_WAIT_TIME)) {
+        resetPreferredUnits();
       }
-    } else if (SOLO.waitForText(
-        // After reset setting, welcome page will show again.
-        activityMytracks.getString(R.string.welcome_title), 0, SHORT_WAIT_TIME)) {
-      resetPreferredUnits();
     }
     
     // Check whether is under recording. If previous test failed, the recording
diff --git a/MyTracksTest/src/com/google/android/apps/mytracks/endtoendtest/SensorTest.java b/MyTracksTest/src/com/google/android/apps/mytracks/endtoendtest/SensorTest.java
new file mode 100644
index 000000000..fcc3eb156
--- /dev/null
+++ b/MyTracksTest/src/com/google/android/apps/mytracks/endtoendtest/SensorTest.java
@@ -0,0 +1,123 @@
+/*
+ * Copyright 2012 Google Inc.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package com.google.android.apps.mytracks.endtoendtest;
+
+import com.google.android.apps.mytracks.TrackListActivity;
+import com.google.android.maps.mytracks.R;
+
+import android.app.Instrumentation;
+import android.test.ActivityInstrumentationTestCase2;
+import android.widget.ListView;
+
+import java.util.ArrayList;
+
+/**
+ * Tests Connect to Sensors.
+ * 
+ * @author Youtao Liu
+ */
+public class SensorTest extends ActivityInstrumentationTestCase2<TrackListActivity> {
+
+  /**
+   * Set to false as default.
+   */
+  public static boolean testSensor = false;
+
+  public SensorTest() {
+    super(TrackListActivity.class);
+  }
+
+  private Instrumentation instrumentation;
+  private TrackListActivity activityMyTracks;
+
+  @Override
+  protected void setUp() throws Exception {
+    super.setUp();
+    instrumentation = getInstrumentation();
+    activityMyTracks = getActivity();
+    EndToEndTestUtils.clearEnvironment = false;
+    EndToEndTestUtils.setupForAllTest(instrumentation, activityMyTracks);
+  }
+
+  /**
+   * Tests connecting to a Zephyr Bluetooth sensor. Before this test, a Zephyr
+   * sensor must has been paired with the device.
+   */
+  public void testConnectZephyrBluetoothSensor() {
+    if (!testSensor) {
+      return;
+    }
+    EndToEndTestUtils.findMenuItem(activityMyTracks.getString(R.string.menu_settings), true);
+    EndToEndTestUtils.SOLO.clickOnText(activityMyTracks.getString(R.string.settings_sensor));
+    EndToEndTestUtils.SOLO.clickOnText(activityMyTracks.getString(R.string.settings_sensor_type));
+    EndToEndTestUtils.SOLO.clickOnText(activityMyTracks
+        .getString(R.string.settings_sensor_type_zephyr));
+    EndToEndTestUtils.SOLO.clickOnText(activityMyTracks
+        .getString(R.string.settings_sensor_bluetooth_sensor));
+    assertTrue(getPairedSensorsNumber() > 0);
+    EndToEndTestUtils.SOLO.goBack();
+    EndToEndTestUtils.SOLO.goBack();
+    EndToEndTestUtils.SOLO.goBack();
+    assertTrue(checkSensorsStatus());
+  }
+
+  /**
+   * Tests connecting to a Polar Bluetooth sensor. Before this test, a Polar
+   * sensor must has been paired with the device.
+   */
+  public void testConnectPolarBluetoothSensor() {
+    if (!testSensor) {
+      return;
+    }
+    EndToEndTestUtils.findMenuItem(activityMyTracks.getString(R.string.menu_settings), true);
+    EndToEndTestUtils.SOLO.clickOnText(activityMyTracks.getString(R.string.settings_sensor));
+    EndToEndTestUtils.SOLO.clickOnText(activityMyTracks.getString(R.string.settings_sensor_type));
+    EndToEndTestUtils.SOLO.clickOnText(activityMyTracks
+        .getString(R.string.settings_sensor_type_polar));
+    EndToEndTestUtils.SOLO.clickOnText(activityMyTracks
+        .getString(R.string.settings_sensor_bluetooth_sensor));
+    assertTrue(getPairedSensorsNumber() > 0);
+    EndToEndTestUtils.SOLO.goBack();
+    EndToEndTestUtils.SOLO.goBack();
+    EndToEndTestUtils.SOLO.goBack();
+    assertTrue(checkSensorsStatus());
+  }
+
+  /**
+   * Get the number of paired sensors.
+   * 
+   * @return the number of paired sensors
+   */
+  private int getPairedSensorsNumber() {
+    ArrayList<ListView> allListViews = EndToEndTestUtils.SOLO.getCurrentListViews();
+    int number = allListViews.get(0).getCount();
+    return number;
+  }
+
+  /**
+   * Checks whether the sensor is connected with MyTracks.
+   * 
+   * @return true means the sensor is connected with MyTracks
+   */
+  private boolean checkSensorsStatus() {
+    EndToEndTestUtils.createTrackIfEmpty(0, false);
+    EndToEndTestUtils.findMenuItem(activityMyTracks.getString(R.string.menu_sensor_state), true);
+    return EndToEndTestUtils.SOLO.waitForText(
+        activityMyTracks.getString(R.string.sensor_state_connected), 1,
+        EndToEndTestUtils.NORMAL_WAIT_TIME);
+  }
+
+}
\ No newline at end of file