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 5b4f88565..58897d0a7 100644
--- a/MyTracksTest/src/com/google/android/apps/mytracks/endtoendtest/EndToEndTestUtils.java
+++ b/MyTracksTest/src/com/google/android/apps/mytracks/endtoendtest/EndToEndTestUtils.java
@@ -116,8 +116,8 @@ public class EndToEndTestUtils {
     MILE_MULTILINGUAL.put("zh", "英里");
   }
 
-  static Solo SOLO;
-  static Instrumentation instrumentation;
+  public static Solo SOLO;
+  public static Instrumentation instrumentation;
   static TrackListActivity activityMytracks;
   // Check whether the UI has an action bar which is related with the version of
   // Android OS.
@@ -848,7 +848,7 @@ public class EndToEndTestUtils {
         .isEnabled());
     Assert.assertNull(findTextView(activityMytracks.getString(R.string.generic_recording)));
     Assert.assertNull(findTextView(activityMytracks.getString(R.string.generic_paused)));
-    TextView totalTime = (TextView) activityMytracks.findViewById(R.id.track_controller_total_time);
+    TextView totalTime = (TextView) SOLO.getCurrentActivity().findViewById(R.id.track_controller_total_time);
     Assert.assertEquals(StringUtils.formatElapsedTimeWithHour(0), totalTime.getText().toString());
   }
 
@@ -884,10 +884,10 @@ public class EndToEndTestUtils {
     Assert.assertNull(findTextView(activityMytracks.getString(R.string.generic_recording)));
     Assert.assertNotNull(findTextView(activityMytracks.getString(R.string.generic_paused)));
 
-    String totalTimeOld = ((TextView) activityMytracks
+    String totalTimeOld = ((TextView) SOLO.getCurrentActivity()
         .findViewById(R.id.track_controller_total_time)).getText().toString();
     sleep(2000);
-    String totalTimeNew = ((TextView) activityMytracks
+    String totalTimeNew = ((TextView) SOLO.getCurrentActivity()
         .findViewById(R.id.track_controller_total_time)).getText().toString();
     Assert.assertTrue(totalTimeOld.equalsIgnoreCase(totalTimeNew));
   }
diff --git a/MyTracksTest/src/com/google/android/apps/mytracks/endtoendtest/GoogleUtils.java b/MyTracksTest/src/com/google/android/apps/mytracks/endtoendtest/GoogleUtils.java
index b3af8ac58..8905535a8 100644
--- a/MyTracksTest/src/com/google/android/apps/mytracks/endtoendtest/GoogleUtils.java
+++ b/MyTracksTest/src/com/google/android/apps/mytracks/endtoendtest/GoogleUtils.java
@@ -207,6 +207,40 @@ public class GoogleUtils {
     return null;
   }
   
+  /**
+   * Delete spreadsheet which name is title.
+   * 
+   * @param title the name of spreadsheet
+   * @param activity to get context
+   */
+  public static void deleteSpreadsheetByTitle(String title, Activity activity) {
+    Context context = activity.getApplicationContext();
+    DocumentsClient documentsClient = new DocumentsClient(
+        GDataClientFactory.getGDataClient(context), new XmlDocsGDataParserFactory(
+            new AndroidXmlParserFactory()));
+
+    try {
+      String documentsAuthToken = AccountManager.get(context).blockingGetAuthToken(
+          getAccount(context), documentsClient.getServiceName(), false);
+      String uri = String.format(Locale.US, SendDocsUtils.GET_SPREADSHEET_BY_TITLE_URI,
+          URLEncoder.encode(title, "utf-8"));
+      GDataParser gDataParser = documentsClient.getParserForFeed(Entry.class, uri,
+          documentsAuthToken);
+      gDataParser.init();
+
+      while (gDataParser.hasMoreData()) {
+        Entry entry = gDataParser.readNextEntry(null);
+        String entryTitle = entry.getTitle();
+        if (entryTitle.equals(title)) {
+          documentsClient.deleteEntry(entry.getEditUri(), documentsAuthToken);
+          Log.d(EndToEndTestUtils.LOG_TAG, "Delete one spreadsheet.");
+        }
+      }
+    } catch (Exception e) {
+      Log.e(EndToEndTestUtils.LOG_TAG, "Unable to fetch spreadsheet.", e);
+    }
+  }
+  
   /**
    * Searches docs in user's Google Documents.
    * 
diff --git a/MyTracksTest/src/com/google/android/apps/mytracks/endtoendtest/SendToGoogleTest.java b/MyTracksTest/src/com/google/android/apps/mytracks/endtoendtest/SendToGoogleTest.java
index 9d6346fc2..f427b7b62 100644
--- a/MyTracksTest/src/com/google/android/apps/mytracks/endtoendtest/SendToGoogleTest.java
+++ b/MyTracksTest/src/com/google/android/apps/mytracks/endtoendtest/SendToGoogleTest.java
@@ -76,6 +76,8 @@ public class SendToGoogleTest extends ActivityInstrumentationTestCase2<TrackList
   public void testSendTwoTracksWithSameActivity() {
     String testActivity = "(TestActivity)";
     EndToEndTestUtils.activityType = testActivity;
+    GoogleUtils.deleteSpreadsheetByTitle("My Tracks-" + EndToEndTestUtils.activityType,
+        EndToEndTestUtils.activityMytracks);
     EndToEndTestUtils.createSimpleTrack(1, false);
     boolean result = sendToGoogle();
     result = result && sendToGoogle();
diff --git a/MyTracksTest/src/com/google/android/apps/mytracks/endtoendtest/SensorTest.java b/MyTracksTest/src/com/google/android/apps/mytracks/endtoendtest/others/SensorTest.java
similarity index 93%
rename from MyTracksTest/src/com/google/android/apps/mytracks/endtoendtest/SensorTest.java
rename to MyTracksTest/src/com/google/android/apps/mytracks/endtoendtest/others/SensorTest.java
index 9d200c6f2..712472140 100644
--- a/MyTracksTest/src/com/google/android/apps/mytracks/endtoendtest/SensorTest.java
+++ b/MyTracksTest/src/com/google/android/apps/mytracks/endtoendtest/others/SensorTest.java
@@ -13,9 +13,10 @@
  * License for the specific language governing permissions and limitations under
  * the License.
  */
-package com.google.android.apps.mytracks.endtoendtest;
+package com.google.android.apps.mytracks.endtoendtest.others;
 
 import com.google.android.apps.mytracks.TrackListActivity;
+import com.google.android.apps.mytracks.endtoendtest.EndToEndTestUtils;
 import com.google.android.maps.mytracks.R;
 
 import android.app.Instrumentation;
@@ -43,7 +44,7 @@ public class SensorTest extends ActivityInstrumentationTestCase2<TrackListActivi
 
   private Instrumentation instrumentation;
   private TrackListActivity activityMyTracks;
-  private final String disableMessage= "Sensor test is disabled"; 
+  public static final String DISABLE_MESSAGE = "This test is disabled"; 
 
   @Override
   protected void setUp() throws Exception {
@@ -59,7 +60,7 @@ public class SensorTest extends ActivityInstrumentationTestCase2<TrackListActivi
    */
   public void testConnectZephyrBluetoothSensor() {
     if (!testSensor) {
-      Log.i(EndToEndTestUtils.LOG_TAG, disableMessage);
+      Log.i(EndToEndTestUtils.LOG_TAG, DISABLE_MESSAGE);
       return;
     }
     EndToEndTestUtils.findMenuItem(activityMyTracks.getString(R.string.menu_settings), true);
@@ -82,7 +83,7 @@ public class SensorTest extends ActivityInstrumentationTestCase2<TrackListActivi
    */
   public void testConnectPolarBluetoothSensor() {
     if (!testSensor) {
-      Log.i(EndToEndTestUtils.LOG_TAG, disableMessage);
+      Log.i(EndToEndTestUtils.LOG_TAG, DISABLE_MESSAGE);
       return;
     }
     EndToEndTestUtils.findMenuItem(activityMyTracks.getString(R.string.menu_settings), true);
diff --git a/MyTracksTest/src/com/google/android/apps/mytracks/endtoendtest/others/StressTest.java b/MyTracksTest/src/com/google/android/apps/mytracks/endtoendtest/others/StressTest.java
new file mode 100644
index 000000000..4e79914be
--- /dev/null
+++ b/MyTracksTest/src/com/google/android/apps/mytracks/endtoendtest/others/StressTest.java
@@ -0,0 +1,134 @@
+/*
+ * 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.others;
+
+import com.google.android.apps.mytracks.TrackListActivity;
+import com.google.android.apps.mytracks.endtoendtest.EndToEndTestUtils;
+import com.google.android.maps.mytracks.R;
+
+import android.app.Instrumentation;
+import android.test.ActivityInstrumentationTestCase2;
+import android.util.Log;
+
+/**
+ * Tests Rotation of MyTracks.
+ * 
+ * @author Youtao Liu
+ */
+public class StressTest extends ActivityInstrumentationTestCase2<TrackListActivity> {
+
+  /**
+   * Set to false as default.
+   */
+  public static boolean testStress = false;
+  public static final int MINUTES_FOR_EACH_TEST = 30;
+  public static final int MILLI_SECOND_IN_ONE_MINUTE = 60 * 1000;
+  long startTime = 0;
+  int trackNumber;
+
+  public StressTest() {
+    super(TrackListActivity.class);
+  }
+
+  private Instrumentation instrumentation;
+  private TrackListActivity activityMyTracks;
+
+  @Override
+  protected void setUp() throws Exception {
+    super.setUp();
+    instrumentation = getInstrumentation();
+    activityMyTracks = getActivity();
+    EndToEndTestUtils.setupForDebug(instrumentation, activityMyTracks);
+    startTime = System.currentTimeMillis();
+    EndToEndTestUtils.emulatorPort = 5568;
+  }
+
+  /**
+   * Records tracks and delete them when there are more than 30 tracks..
+   */
+  public void testRecordAndDeleteTracks() {
+    if (!testStress) {
+      Log.i(EndToEndTestUtils.LOG_TAG, SensorTest.DISABLE_MESSAGE);
+      return;
+    }
+    for (int i = 0; (System.currentTimeMillis() - startTime) / MILLI_SECOND_IN_ONE_MINUTE < MINUTES_FOR_EACH_TEST; i++) {
+      EndToEndTestUtils.startRecording();
+      // Points in a tracks keep increasing.
+      EndToEndTestUtils.sendGps(i * 10, 0, 10);
+      EndToEndTestUtils.stopRecording(true);
+      EndToEndTestUtils.SOLO.goBack();
+      EndToEndTestUtils.instrumentation.waitForIdleSync();
+      trackNumber = EndToEndTestUtils.SOLO.getCurrentListViews().get(0).getCount();
+      if (trackNumber > 30) {
+        EndToEndTestUtils.deleteAllTracks();
+      }
+      logStatus(i);
+    }
+  }
+
+  /**
+   * Rotates screen when display map view.
+   */
+  public void testRotateMapViewInTrackDetailActivity() {
+    if (!testStress) {
+      Log.i(EndToEndTestUtils.LOG_TAG, SensorTest.DISABLE_MESSAGE);
+      return;
+    }
+    EndToEndTestUtils.startRecording();
+    for (int i = 0; (System.currentTimeMillis() - startTime) / MILLI_SECOND_IN_ONE_MINUTE < MINUTES_FOR_EACH_TEST; i++) {
+      EndToEndTestUtils.sendGps(10, i * 10);
+      EndToEndTestUtils.rotateCurrentActivity();
+    }
+  }
+
+  /**
+   * Switches view between CHART, MAP and STAT.
+   */
+  public void testSwitchTabs() {
+    if (!testStress) {
+      Log.i(EndToEndTestUtils.LOG_TAG, SensorTest.DISABLE_MESSAGE);
+      return;
+    }
+    EndToEndTestUtils.startRecording();
+    int i = 0;
+    while ((System.currentTimeMillis() - startTime) / MILLI_SECOND_IN_ONE_MINUTE < MINUTES_FOR_EACH_TEST) {
+      EndToEndTestUtils.SOLO.clickOnText(activityMyTracks.getString(R.string.track_detail_map_tab));
+      instrumentation.waitForIdleSync();
+      EndToEndTestUtils.SOLO.clickOnText(activityMyTracks
+          .getString(R.string.track_detail_chart_tab));
+      instrumentation.waitForIdleSync();
+      EndToEndTestUtils.SOLO.clickOnText(activityMyTracks
+          .getString(R.string.track_detail_stats_tab));
+      instrumentation.waitForIdleSync();
+      logStatus(++i);
+    }
+  }
+
+  /**
+   * Displays log message.
+   * 
+   * @param times this test has been run
+   */
+  private void logStatus(int times) {
+    Log.i(EndToEndTestUtils.LOG_TAG, "This test has run "
+        + times
+        + " times and will be finished in "
+        + (MINUTES_FOR_EACH_TEST - (System.currentTimeMillis() - startTime)
+            / MILLI_SECOND_IN_ONE_MINUTE) + " minutes!");
+    Log.i(EndToEndTestUtils.LOG_TAG, "There are " + trackNumber + " tracks!");
+  }
+
+}