Merge "[Settings] Add test cases for App LocalePicker page" into main

src/com/android/settings/localepicker/AppLocaleAllListPreferenceController.java

@@ -31,6 +31,7 @@ import android.util.Log;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
+import androidx.annotation.VisibleForTesting;
 import androidx.core.app.NotificationCompat;
 import androidx.preference.Preference;
 import androidx.preference.PreferenceCategory;
@@ -62,6 +63,7 @@ public class AppLocaleAllListPreferenceController extends
     private static final String KEY_PREFERENCE_CATEGORY_ADD_LANGUAGE_ALL_SUPPORTED =
             "system_language_all_supported_category";
 
+    private Activity mActivity;
     @SuppressWarnings("NullAway")
     private PreferenceCategory mPreferenceCategory;
     private Set<LocaleStore.LocaleInfo> mLocaleList;
@@ -84,12 +86,15 @@ public class AppLocaleAllListPreferenceController extends
     @SuppressWarnings("NullAway")
     public AppLocaleAllListPreferenceController(@NonNull Context context,
             @NonNull String preferenceKey, @Nullable String packageName,
-            boolean isNumberingSystemMode, @NonNull LocaleStore.LocaleInfo parentLocale) {
+            boolean isNumberingSystemMode, @NonNull LocaleStore.LocaleInfo parentLocale,
+            @NonNull Activity activity, @NonNull AppLocaleCollector appLocaleCollector) {
         super(context, preferenceKey);
         mPackageName = packageName;
         mIsNumberingSystemMode = isNumberingSystemMode;
         mParentLocale = parentLocale;
         mIsCountryMode = mParentLocale != null;
+        mActivity = activity;
+        mAppLocaleCollector = appLocaleCollector;
     }
 
     @Override
@@ -137,7 +142,8 @@ public class AppLocaleAllListPreferenceController extends
         setupSupportedPreference(newList, existingSupportedPreferences);
     }
 
-    private void setupSupportedPreference(List<LocaleStore.LocaleInfo> localeInfoList,
+    @VisibleForTesting
+    void setupSupportedPreference(List<LocaleStore.LocaleInfo> localeInfoList,
             Map<String, Preference> existingSupportedPreferences) {
         if (mIsNumberingSystemMode) {
             mPreferenceCategory.setTitle("");
@@ -163,6 +169,7 @@ public class AppLocaleAllListPreferenceController extends
             // TODO: b/388199937 - Switch to correct fragment.
             Log.d(TAG, "setupPreference: mIsCountryMode = " + mIsCountryMode);
             switchFragment(mContext, locale, shouldShowAppLanguage(locale));
+            mActivity.finish();
             return true;
         });
         mSupportedPreferences.put(locale.getId(), pref);
@@ -173,7 +180,8 @@ public class AppLocaleAllListPreferenceController extends
         return AVAILABLE;
     }
 
-    private void switchFragment(Context context, LocaleStore.LocaleInfo localeInfo,
+    @VisibleForTesting
+    void switchFragment(Context context, LocaleStore.LocaleInfo localeInfo,
             boolean shouldShowAppLanguage) {
         if (shouldShowAppLanguage) {
             LocaleUtils.onLocaleSelected(mContext, localeInfo, mPackageName);
@@ -190,10 +198,10 @@ public class AppLocaleAllListPreferenceController extends
                     .setArguments(extra)
                     .launch();
         }
-        ((Activity) mContext).finish();
     }
 
-    private boolean shouldShowAppLanguage(LocaleStore.LocaleInfo localeInfo) {
+    @VisibleForTesting
+    boolean shouldShowAppLanguage(LocaleStore.LocaleInfo localeInfo) {
         boolean isSystemLocale = localeInfo.isSystemLocale();
         boolean isRegionLocale = localeInfo.getParent() != null;
         boolean mayHaveDifferentNumberingSystem = localeInfo.hasNumberingSystems();

src/com/android/settings/localepicker/AppLocalePickerFragment.java

@@ -400,13 +400,14 @@ public class AppLocalePickerFragment extends DashboardFragment implements
         mIsNumberingMode = args.getBoolean(
                 RegionAndNumberingSystemPickerFragment.EXTRA_IS_NUMBERING_SYSTEM);
 
+        AppLocaleCollector appLocaleCollector = new AppLocaleCollector(context, mPackageName);
         mSuggestedListPreferenceController =
                 new AppLocaleSuggestedListPreferenceController(context,
                         KEY_PREFERENCE_APP_LOCALE_SUGGESTED_LIST, mPackageName, mIsNumberingMode,
-                        mLocaleInfo);
+                        mLocaleInfo, getActivity(), appLocaleCollector);
         mAppLocaleAllListPreferenceController = new AppLocaleAllListPreferenceController(
                 context, KEY_PREFERENCE_APP_LOCALE_LIST, mPackageName, mIsNumberingMode,
-                mLocaleInfo);
+                mLocaleInfo, getActivity(), appLocaleCollector);
         final List<AbstractPreferenceController> controllers = new ArrayList<>();
         controllers.add(mSuggestedListPreferenceController);
         controllers.add(mAppLocaleAllListPreferenceController);

src/com/android/settings/localepicker/AppLocaleSuggestedListPreferenceController.java

@@ -26,6 +26,7 @@ import android.util.Log;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
+import androidx.annotation.VisibleForTesting;
 import androidx.core.app.NotificationCompat;
 import androidx.preference.Preference;
 import androidx.preference.PreferenceCategory;
@@ -55,6 +56,7 @@ public class AppLocaleSuggestedListPreferenceController extends
     private static final String KEY_PREFERENCE_CATEGORY_ADD_A_LANGUAGE_SUGGESTED =
             "system_language_suggested_category";
 
+    private Activity mActivity;
     @SuppressWarnings("NullAway")
     private PreferenceCategory mPreferenceCategory;
     private Set<LocaleStore.LocaleInfo> mLocaleList;
@@ -76,12 +78,15 @@ public class AppLocaleSuggestedListPreferenceController extends
     @SuppressWarnings("NullAway")
     public AppLocaleSuggestedListPreferenceController(@NonNull Context context,
             @NonNull String preferenceKey, @Nullable String packageName,
-            boolean isNumberingSystemMode, @NonNull LocaleStore.LocaleInfo parentLocale) {
+            boolean isNumberingSystemMode, @NonNull LocaleStore.LocaleInfo parentLocale,
+            @NonNull Activity activity, @NonNull AppLocaleCollector appLocaleCollector) {
         super(context, preferenceKey);
         mPackageName = packageName;
         mIsNumberingSystemMode = isNumberingSystemMode;
         mParentLocale = parentLocale;
         mIsCountryMode = mParentLocale != null;
+        mActivity = activity;
+        mAppLocaleCollector = appLocaleCollector;
     }
 
     @Override
@@ -92,7 +97,6 @@ public class AppLocaleSuggestedListPreferenceController extends
                         ? KEY_PREFERENCE_CATEGORY_ADD_A_LANGUAGE_SUGGESTED
                         : KEY_PREFERENCE_CATEGORY_APP_LANGUAGE_SUGGESTED);
 
-        mAppLocaleCollector = new AppLocaleCollector(mContext, mPackageName);
         mSuggestedPreferences = new ArrayMap<>();
         mLocaleOptions = new ArrayList<>();
         updatePreferences();
@@ -129,7 +133,8 @@ public class AppLocaleSuggestedListPreferenceController extends
         setupSuggestedPreference(newList, existingSuggestedPreferences);
     }
 
-    private void setupSuggestedPreference(List<LocaleStore.LocaleInfo> localeInfoList,
+    @VisibleForTesting
+    void setupSuggestedPreference(List<LocaleStore.LocaleInfo> localeInfoList,
             Map<String, Preference> existingSuggestedPreferences) {
         for (LocaleStore.LocaleInfo locale : localeInfoList) {
             if (mIsNumberingSystemMode || mIsCountryMode) {
@@ -150,7 +155,7 @@ public class AppLocaleSuggestedListPreferenceController extends
                 }
             }
         }
-        Log.d(TAG, "setupSuggestedPreference, mPreferenceCategory setVisible"
+        Log.d(TAG, "setupSuggestedPreference, mPreferenceCategory setVisible = "
                 + (mPreferenceCategory.getPreferenceCount() > 0));
         mPreferenceCategory.setVisible(mPreferenceCategory.getPreferenceCount() > 0);
     }
@@ -167,7 +172,7 @@ public class AppLocaleSuggestedListPreferenceController extends
         pref.setKey(locale.toString());
         pref.setOnPreferenceClickListener(clickedPref -> {
             LocaleUtils.onLocaleSelected(mContext, locale, mPackageName);
-            ((Activity) mContext).finish();
+            mActivity.finish();
             return true;
         });
         mSuggestedPreferences.put(locale.getId(), pref);

src/com/android/settings/localepicker/RegionAndNumberingSystemPickerFragment.java

@@ -37,6 +37,7 @@ import androidx.preference.PreferenceCategory;
 import androidx.preference.PreferenceScreen;
 import androidx.recyclerview.widget.RecyclerView;
 
+import com.android.internal.app.AppLocaleCollector;
 import com.android.internal.app.LocaleHelper;
 import com.android.internal.app.LocaleStore;
 import com.android.settings.R;
@@ -329,13 +330,14 @@ public class RegionAndNumberingSystemPickerFragment extends DashboardFragment im
             controllers.add(mSuggestedListPreferenceController);
             controllers.add(mSystemLocaleAllListPreferenceController);
         } else {
+            AppLocaleCollector appLocaleCollector = new AppLocaleCollector(context, mPackageName);
             mAppLocaleSuggestedListPreferenceController =
                     new AppLocaleSuggestedListPreferenceController(context,
                             KEY_PREFERENCE_APP_LOCALE_SUGGESTED_LIST, mPackageName,
-                            mIsNumberingMode, mLocaleInfo);
+                            mIsNumberingMode, mLocaleInfo, getActivity(), appLocaleCollector);
             mAppLocaleAllListPreferenceController = new AppLocaleAllListPreferenceController(
                     context, KEY_PREFERENCE_APP_LOCALE_LIST, mPackageName, mIsNumberingMode,
-                    mLocaleInfo);
+                    mLocaleInfo, getActivity(), appLocaleCollector);
             controllers.add(mAppLocaleSuggestedListPreferenceController);
             controllers.add(mAppLocaleAllListPreferenceController);
         }

tests/robotests/src/com/android/settings/localepicker/AppLocaleAllListPreferenceControllerTest.java

@@ -0,0 +1,190 @@
+/**
+ * Copyright (C) 2025 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.settings.localepicker;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.assertFalse;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyInt;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.ArgumentMatchers.isA;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.app.Activity;
+import android.app.IActivityManager;
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.content.res.Configuration;
+import android.os.LocaleList;
+import android.os.Looper;
+import android.telephony.TelephonyManager;
+import android.util.ArrayMap;
+import android.util.Log;
+
+import com.android.internal.app.AppLocaleCollector;
+import com.android.internal.app.LocaleStore;
+import com.android.settings.R;
+import com.android.settings.backup.BackupSettingsFragment;
+import com.android.settings.testutils.shadow.ShadowActivityManager;
+import com.android.settings.testutils.shadow.ShadowFragment;
+import com.android.settingslib.widget.SelectorWithWidgetPreference;
+
+import androidx.fragment.app.FragmentTransaction;
+import androidx.preference.Preference;
+import androidx.preference.PreferenceCategory;
+import androidx.preference.PreferenceFragmentCompat;
+import androidx.preference.PreferenceManager;
+import androidx.preference.PreferenceScreen;
+import androidx.test.InstrumentationRegistry;
+import androidx.test.core.app.ApplicationProvider;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.Robolectric;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.RuntimeEnvironment;
+import org.robolectric.Shadows;
+import org.robolectric.shadows.ShadowTelephonyManager;
+import org.robolectric.annotation.Config;
+import org.robolectric.util.ReflectionHelpers;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+@RunWith(RobolectricTestRunner.class)
+@Config(shadows = {
+        ShadowFragment.class,
+        ShadowActivityManager.class,
+})
+public class AppLocaleAllListPreferenceControllerTest {
+    private static final String KEY_CATEGORY_APP_SUUPPORTED_LIST =
+            "app_language_all_supported_category";
+    private static final String KEY_ALL_LOCALE = "app_locale_list";
+    private static final String TEST_PACKAGE_NAME = "com.android.settings";
+
+    private Activity mActivity;
+    private Context mContext;
+    private PreferenceCategory mPreferenceCategory;
+    private AppLocaleAllListPreferenceController mController;
+    private Set<LocaleStore.LocaleInfo> mSupportedLocale;
+    @Mock
+    private PreferenceManager mPreferenceManager;
+    @Mock
+    private PreferenceScreen mPreferenceScreen;
+    @Mock
+    private IActivityManager mActivityService;
+    @Mock
+    private LocaleStore.LocaleInfo mSupportedLocaleInfo_1;
+    @Mock
+    private FragmentTransaction mFragmentTransaction;
+    @Mock
+    private SharedPreferences mSharedPreferences;
+    private AppLocaleCollector mAppLocaleCollector;
+
+    @Before
+    public void setUp() throws Exception {
+        MockitoAnnotations.initMocks(this);
+        mActivity = Robolectric.setupActivity(Activity.class);
+        mContext = spy(ApplicationProvider.getApplicationContext());
+        if (Looper.myLooper() == null) {
+            Looper.prepare();
+        }
+
+        ShadowActivityManager.setService(mActivityService);
+        final Configuration config = new Configuration();
+        setUpLocaleConditions();
+        config.setLocales(new LocaleList(mSupportedLocaleInfo_1.getLocale()));
+        when(mActivityService.getConfiguration()).thenReturn(config);
+        ShadowTelephonyManager shadowTelephonyManager =
+                Shadows.shadowOf(mContext.getSystemService(TelephonyManager.class));
+        shadowTelephonyManager.setSimCountryIso("us");
+        shadowTelephonyManager.setNetworkCountryIso("us");
+        mAppLocaleCollector = spy(
+                new AppLocaleCollector(InstrumentationRegistry.getContext(), TEST_PACKAGE_NAME));
+        mPreferenceCategory = spy(new PreferenceCategory(mContext, null));
+        when(mPreferenceScreen.getPreferenceManager()).thenReturn(mPreferenceManager);
+        when(mPreferenceCategory.getPreferenceManager()).thenReturn(mPreferenceManager);
+        when(mPreferenceManager.getSharedPreferences()).thenReturn(mSharedPreferences);
+        when(mPreferenceScreen.findPreference(KEY_CATEGORY_APP_SUUPPORTED_LIST)).thenReturn(
+                mPreferenceCategory);
+        mPreferenceCategory.setKey(KEY_CATEGORY_APP_SUUPPORTED_LIST);
+        mPreferenceScreen.addPreference(mPreferenceCategory);
+        mController = new AppLocaleAllListPreferenceController(mContext, KEY_ALL_LOCALE,
+                TEST_PACKAGE_NAME, false, null, mActivity, mAppLocaleCollector);
+    }
+
+    private void setUpLocaleConditions() {
+        when(mSupportedLocaleInfo_1.getFullNameNative()).thenReturn("English (United States)");
+        when(mSupportedLocaleInfo_1.getLocale()).thenReturn(
+                LocaleList.forLanguageTags("en-US").get(0));
+        when(mSupportedLocaleInfo_1.getId()).thenReturn("en-US");
+    }
+
+    @Test
+    public void displayPreference_hasSupportedPreference_categoryIsVisible() {
+        mController.displayPreference(mPreferenceScreen);
+        mSupportedLocale = mAppLocaleCollector.getSupportedLocaleList(null, false, false);
+        List<LocaleStore.LocaleInfo> localeList = new ArrayList<>();
+        localeList.addAll(
+                mSupportedLocale.stream().filter(localeInfo -> !localeInfo.isSuggested()).collect(
+                        Collectors.toList()));
+
+        assertTrue(mPreferenceCategory.isVisible());
+        assertThat(mPreferenceCategory.getPreferenceCount()).isEqualTo(localeList.size());
+    }
+
+    @Test
+    public void onPreferenceClick_shouldShowAppLanguagePage() {
+        Context activityContext = mock(Context.class);
+        mController = new AppLocaleAllListPreferenceController(activityContext, KEY_ALL_LOCALE,
+                TEST_PACKAGE_NAME, false, null, mActivity, mAppLocaleCollector);
+        when(mSupportedLocaleInfo_1.isSuggested()).thenReturn(false);
+        when(mSupportedLocaleInfo_1.isSystemLocale()).thenReturn(true);
+        when(mSupportedLocaleInfo_1.getParent()).thenReturn(null);
+        boolean shouldShowAppLanguage = mController.shouldShowAppLanguage(mSupportedLocaleInfo_1);
+        mController.switchFragment(activityContext, mSupportedLocaleInfo_1, shouldShowAppLanguage);
+
+        verify(mFragmentTransaction, never()).add(any(), anyString());
+    }
+
+    @Test
+    public void onPreferenceClick_shouldShowRegionalPage() {
+        Context activityContext = mock(Context.class);
+        mController = new AppLocaleAllListPreferenceController(activityContext, KEY_ALL_LOCALE,
+                TEST_PACKAGE_NAME, false, null, mActivity, mAppLocaleCollector);
+        when(mSupportedLocaleInfo_1.isSuggested()).thenReturn(false);
+        when(mSupportedLocaleInfo_1.isSystemLocale()).thenReturn(false);
+        when(mSupportedLocaleInfo_1.getParent()).thenReturn(null);
+        boolean shouldShowAppLanguage = mController.shouldShowAppLanguage(mSupportedLocaleInfo_1);
+        mController.switchFragment(activityContext, mSupportedLocaleInfo_1, shouldShowAppLanguage);
+
+        verify(mFragmentTransaction, never()).add(any(RegionAndNumberingSystemPickerFragment.class),
+                anyString());
+    }
+}

tests/robotests/src/com/android/settings/localepicker/AppLocaleSuggestedListPreferenceControllerTest.java

@@ -0,0 +1,181 @@
+/**
+ * Copyright (C) 2025 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.settings.localepicker;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.junit.Assert.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.app.Activity;
+import android.app.IActivityManager;
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.content.res.Configuration;
+import android.os.LocaleList;
+import android.os.Looper;
+import android.telephony.TelephonyManager;
+import android.util.ArrayMap;
+
+import com.android.internal.app.AppLocaleCollector;
+import com.android.internal.app.LocaleStore;
+import com.android.settings.R;
+import com.android.settings.testutils.shadow.ShadowActivityManager;
+import com.android.settings.testutils.shadow.ShadowFragment;
+import com.android.settingslib.widget.SelectorWithWidgetPreference;
+
+import androidx.fragment.app.FragmentTransaction;
+import androidx.preference.Preference;
+import androidx.preference.PreferenceCategory;
+import androidx.preference.PreferenceFragmentCompat;
+import androidx.preference.PreferenceManager;
+import androidx.preference.PreferenceScreen;
+import androidx.test.InstrumentationRegistry;
+import androidx.test.core.app.ApplicationProvider;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.Robolectric;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.RuntimeEnvironment;
+import org.robolectric.Shadows;
+import org.robolectric.shadows.ShadowTelephonyManager;
+import org.robolectric.annotation.Config;
+import org.robolectric.util.ReflectionHelpers;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+@RunWith(RobolectricTestRunner.class)
+@Config(shadows = {
+        ShadowFragment.class,
+        ShadowActivityManager.class,
+})
+public class AppLocaleSuggestedListPreferenceControllerTest {
+    private static final String KEY_CATEGORY_APP_SUGGESTED_LIST =
+            "app_language_suggested_category";
+    private static final String KEY_SUGGESTED = "app_locale_suggested_list";
+    private static final String TEST_PACKAGE_NAME = "com.android.settings";
+
+    private Activity mActivity;
+    private Context mContext;
+    private PreferenceCategory mPreferenceCategory;
+    private AppLocaleSuggestedListPreferenceController mController;
+    private List<LocaleStore.LocaleInfo> mLocaleList;
+    private Set<LocaleStore.LocaleInfo> mSuggestedLocale;
+    private Map<String, Preference> mPreferences = new ArrayMap<>();
+    private AppLocaleCollector mAppLocaleCollector;
+    @Mock
+    private PreferenceManager mPreferenceManager;
+    @Mock
+    private PreferenceScreen mPreferenceScreen;
+    @Mock
+    private IActivityManager mActivityService;
+    @Mock
+    private LocaleStore.LocaleInfo mSuggestedLocaleInfo_1;
+    @Mock
+    private LocaleStore.LocaleInfo mSuggestedLocaleInfo_2;
+    @Mock
+    private FragmentTransaction mFragmentTransaction;
+    @Mock
+    private SharedPreferences mSharedPreferences;
+
+    @Before
+    public void setUp() throws Exception {
+        MockitoAnnotations.initMocks(this);
+        mActivity = Robolectric.setupActivity(Activity.class);
+        mContext = spy(ApplicationProvider.getApplicationContext());
+        if (Looper.myLooper() == null) {
+            Looper.prepare();
+        }
+
+        ShadowActivityManager.setService(mActivityService);
+        final Configuration config = new Configuration();
+        setUpLocaleConditions();
+        config.setLocales(new LocaleList(mSuggestedLocaleInfo_1.getLocale(),
+                mSuggestedLocaleInfo_2.getLocale()));
+        when(mActivityService.getConfiguration()).thenReturn(config);
+        ShadowTelephonyManager shadowTelephonyManager =
+                Shadows.shadowOf(mContext.getSystemService(TelephonyManager.class));
+        shadowTelephonyManager.setSimCountryIso("us");
+        shadowTelephonyManager.setNetworkCountryIso("us");
+        mAppLocaleCollector = spy(
+                new AppLocaleCollector(InstrumentationRegistry.getContext(), TEST_PACKAGE_NAME));
+        mPreferenceCategory = spy(new PreferenceCategory(mContext, null));
+        when(mPreferenceScreen.getPreferenceManager()).thenReturn(mPreferenceManager);
+        when(mPreferenceCategory.getPreferenceManager()).thenReturn(mPreferenceManager);
+        when(mPreferenceManager.getSharedPreferences()).thenReturn(mSharedPreferences);
+        when(mPreferenceScreen.findPreference(KEY_CATEGORY_APP_SUGGESTED_LIST)).thenReturn(
+                mPreferenceCategory);
+        mPreferenceCategory.setKey(KEY_CATEGORY_APP_SUGGESTED_LIST);
+        mPreferenceScreen.addPreference(mPreferenceCategory);
+        mController = new AppLocaleSuggestedListPreferenceController(mContext, KEY_SUGGESTED,
+                TEST_PACKAGE_NAME, false, null, mActivity, mAppLocaleCollector);
+    }
+
+    private void setUpLocaleConditions() {
+        mLocaleList = new ArrayList<>();
+        when(mSuggestedLocaleInfo_1.getFullNameNative()).thenReturn("English (United States)");
+        when(mSuggestedLocaleInfo_1.getLocale()).thenReturn(
+                LocaleList.forLanguageTags("en-US").get(0));
+        when(mSuggestedLocaleInfo_1.getId()).thenReturn("en-US");
+        mLocaleList.add(mSuggestedLocaleInfo_1);
+        when(mSuggestedLocaleInfo_2.getFullNameNative()).thenReturn("Español (Estados Unidos)");
+        when(mSuggestedLocaleInfo_2.getLocale()).thenReturn(
+                LocaleList.forLanguageTags("es-US").get(0));
+        when(mSuggestedLocaleInfo_2.getId()).thenReturn("es-US");
+        mLocaleList.add(mSuggestedLocaleInfo_2);
+    }
+
+    @Test
+    public void displayPreference_hasSupportedPreference_categoryIsVisible() {
+        mController.displayPreference(mPreferenceScreen);
+        mSuggestedLocale = mAppLocaleCollector.getSupportedLocaleList(null, false, false);
+        List<LocaleStore.LocaleInfo> localeList = new ArrayList<>();
+        localeList.addAll(
+                mSuggestedLocale.stream().filter(localeInfo -> localeInfo.isSuggested()).collect(
+                        Collectors.toList()));
+
+        assertTrue(mPreferenceCategory.isVisible());
+        assertThat(mPreferenceCategory.getPreferenceCount()).isEqualTo(localeList.size());
+    }
+
+    @Test
+    public void onPreferenceClick_shouldShowAppLanguagePage() {
+        mContext = RuntimeEnvironment.application;
+        mController = new AppLocaleSuggestedListPreferenceController(mContext, KEY_SUGGESTED,
+                TEST_PACKAGE_NAME, false, null, mActivity, mAppLocaleCollector);
+        mController.displayPreference(mPreferenceScreen);
+        mController.setupSuggestedPreference(mLocaleList, mPreferences);
+        SelectorWithWidgetPreference preference = mPreferenceCategory.findPreference(
+                mSuggestedLocaleInfo_1.toString());
+        preference.performClick();
+
+        verify(mFragmentTransaction, never()).add(any(), anyString());
+    }
+}