Refactor IMEAndLanguageSettings to use PreferenceController

Bug: 32642706
Bug: 32637613
Bug: 32643833
Test: RunSettingsRoboTests

This change is necessary to test preference controlling logic, as well
as making preferences reusable in other Preference pages in the new
information architecture.

Change-Id: I9e2fd2f6800579f005a5c303ed03ae06477006a6

tests/robotests/src/com/android/settings/language/PhoneLanguagePreferenceControllerTest.java

@@ -0,0 +1,80 @@
+/*
+ * 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.settings.language;
+
+import android.content.Context;
+import android.support.v7.preference.Preference;
+
+import com.android.settings.SettingsRobolectricTestRunner;
+import com.android.settings.TestConfig;
+import com.android.settings.testutils.FakeFeatureFactory;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Answers;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.annotation.Config;
+
+import static com.google.common.truth.Truth.assertThat;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
+public class PhoneLanguagePreferenceControllerTest {
+
+    @Mock(answer = Answers.RETURNS_DEEP_STUBS)
+    private Context mContext;
+    @Mock
+    private Preference mPreference;
+    private FakeFeatureFactory mFeatureFactory;
+    private PhoneLanguagePreferenceController mController;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        FakeFeatureFactory.setupForTest(mContext);
+        mFeatureFactory = (FakeFeatureFactory) FakeFeatureFactory.getFactory(mContext);
+        mController = new PhoneLanguagePreferenceController(mContext);
+    }
+
+    @Test
+    public void testIsAvailable_hasMultipleLocales_shouldReturnTrue() {
+        when(mContext.getAssets().getLocales()).thenReturn(new String[]{"en", "de"});
+
+        assertThat(mController.isAvailable()).isTrue();
+    }
+
+    @Test
+    public void testIsAvailable_hasSingleLocales_shouldReturnFalse() {
+        when(mContext.getAssets().getLocales()).thenReturn(new String[]{"en"});
+
+        assertThat(mController.isAvailable()).isFalse();
+    }
+
+    @Test
+    public void testUpdateState_shouldUpdateSummary() {
+        final String testSummary = "test";
+        when(mFeatureFactory.localeFeatureProvider.getLocaleNames()).thenReturn(testSummary);
+
+        mController.updateState(mPreference);
+
+        verify(mPreference).setSummary(testSummary);
+    }
+}