diff --git a/tests/Android.mk b/tests/Android.mk
index 322dad2..ba6944d 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -31,6 +31,8 @@
 
 LOCAL_STATIC_JAVA_LIBRARIES := \
         android-support-test \
-        mockito-target-minus-junit4
+        mockito-target-minus-junit4 \
+        espresso-core \
+        truth-prebuilt
 
 include $(BUILD_PACKAGE)
diff --git a/tests/src/com/android/phone/RoamingDialogFragmentTest.java b/tests/src/com/android/phone/RoamingDialogFragmentTest.java
new file mode 100644
index 0000000..96a3fda
--- /dev/null
+++ b/tests/src/com/android/phone/RoamingDialogFragmentTest.java
@@ -0,0 +1,123 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * 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.android.phone;
+
+import android.app.Activity;
+import android.content.pm.ActivityInfo;
+import android.provider.Settings.Global;
+import android.provider.Settings.SettingNotFoundException;
+import android.support.test.espresso.matcher.PreferenceMatchers;
+import android.support.test.rule.ActivityTestRule;
+import com.google.common.truth.Truth;
+import junit.framework.AssertionFailedError;
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+
+import static android.support.test.espresso.Espresso.onData;
+import static android.support.test.espresso.Espresso.onView;
+import static android.support.test.espresso.action.ViewActions.click;
+import static android.support.test.espresso.assertion.ViewAssertions.doesNotExist;
+import static android.support.test.espresso.assertion.ViewAssertions.matches;
+import static android.support.test.espresso.matcher.ViewMatchers.hasDescendant;
+import static android.support.test.espresso.matcher.ViewMatchers.isChecked;
+import static android.support.test.espresso.matcher.ViewMatchers.isDisplayed;
+import static android.support.test.espresso.matcher.ViewMatchers.withId;
+import static android.support.test.espresso.matcher.ViewMatchers.withText;
+import static com.google.common.truth.Truth.assertThat;
+
+/**
+ * Espresso tests to check some properties of the dialog that appears when a user
+ * tries to turn on data roaming.
+ */
+public class RoamingDialogFragmentTest {
+
+    @Rule
+    public ActivityTestRule<MobileNetworkSettings> mRule =
+            new ActivityTestRule<>(MobileNetworkSettings.class);
+    private Activity mActivity;
+
+    /**
+     * Make sure roaming is off before we start a test since this checks the dialog that only
+     * shows up when we try to turn it on.
+     */
+    @Before
+    public void disableRoaming() {
+        mActivity = mRule.getActivity();
+
+        // turn off data roaming if it is on
+        try {
+            onData(PreferenceMatchers.withTitle(R.string.roaming))
+                    .check(matches(hasDescendant(isChecked())))
+                    .perform(click());
+        } catch (AssertionFailedError e) {
+            // don't click the switch if it is already off.
+        }
+    }
+
+    @Test
+    public void dataRoamingDialogPersistsOnRotation() {
+        // click on the data roaming preference to trigger warning dialog
+        onData(PreferenceMatchers.withTitle(R.string.roaming)).perform(click());
+
+        // request both orientations to ensure at least one rotation occurs
+        mActivity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
+        mActivity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
+
+        // verify the title of the dialog is visible
+        onView(withText(R.string.roaming_alert_title)).check(matches(isDisplayed()));
+
+    }
+
+    @Test
+    public void dataRoamingEnabledWhenPositiveButtonClicked() throws SettingNotFoundException {
+        // click on the data roaming preference to trigger warning dialog
+        onData(PreferenceMatchers.withTitle(R.string.roaming)).perform(click());
+
+        // click to confirm we want to turn on data roaming
+        onView(withId(android.R.id.button1)).perform(click());
+
+        // verify that the the setting has actually been changed
+        assertThat(Global.getInt(mActivity.getApplicationContext().getContentResolver(),
+                Global.DATA_ROAMING)).isEqualTo(1);
+    }
+
+    @Test
+    public void dialogDismissedOnNegativeButtonClicked() {
+        // click on the data roaming preference to trigger warning dialog
+        onData(PreferenceMatchers.withTitle(R.string.roaming)).perform(click());
+
+        // click to cancel turning on data roaming
+        onView(withId(android.R.id.button2)).perform(click());
+
+        // verify the title of the dialog is gone
+        onView(withText(R.string.roaming_alert_title)).check(doesNotExist());
+    }
+
+    @Test
+    public void dataRoamingStaysDisabledWhenDialogCanceled() throws SettingNotFoundException {
+        // click on the data roaming preference to trigger warning dialog
+        onData(PreferenceMatchers.withTitle(R.string.roaming)).perform(click());
+
+        // click to cancel turning on data roaming
+        onView(withId(android.R.id.button2)).perform(click());
+
+        // verify that the the setting has not been changed
+        assertThat(Global.getInt(mActivity.getApplicationContext().getContentResolver(),
+                Global.DATA_ROAMING)).isEqualTo(0);
+
+    }
+}