Fix robotests.

Couldn't find config_headlineFontFamily. Added some
SettingsShadowResources.overrideResource calls.

Change-Id: I13f5b5dd6b97057e7f77cc4d15abdb6451314b50
Fixes: 64024743
Test: robotests

tests/robotests/src/com/android/settings/datausage/DataPlanSummaryPreferenceTest.java

@@ -29,6 +29,7 @@ import com.android.settings.TestConfig;
 import com.android.settings.testutils.SettingsRobolectricTestRunner;
 import com.android.settings.testutils.shadow.SettingsShadowResources;
 import com.android.settings.widget.DonutView;
+import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -56,6 +57,8 @@ public final class DataPlanSummaryPreferenceTest {
 
     @Before
     public void setUp() {
+        SettingsShadowResources.overrideResource(
+                com.android.internal.R.string.config_headlineFontFamily, "");
         Context context = RuntimeEnvironment.application;
         mPreference = new DataPlanSummaryPreference(context);
         LayoutInflater inflater = LayoutInflater.from(context);
@@ -64,6 +67,11 @@ public final class DataPlanSummaryPreferenceTest {
         mHolder = PreferenceViewHolder.createInstanceForTests(view);
     }
 
+    @After
+    public void tearDown() {
+        SettingsShadowResources.reset();
+    }
+
     @Test
     public void shouldRender_withoutData() {
         mPreference.onBindViewHolder(mHolder);