Move system update preference from device_info to system.

In order to move the preference and its logic cleanly, created a
controller object that encapsulates the preference/click handler.

Bug: 31801428
Test: RunSettingsRoboTests
Change-Id: I332384e20fbf0e21d2f3becb531d97b20f7f7ef1

tests/robotests/src/com/android/settings/deviceinfo/SystemUpdatePreferenceControllerTest.java

@@ -0,0 +1,102 @@
+/*
+ * 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.deviceinfo;
+
+import android.content.Context;
+import android.os.UserManager;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceScreen;
+
+import com.android.settings.R;
+import com.android.settings.TestConfig;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.annotation.Config;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static com.google.common.truth.Truth.assertThat;
+import static org.mockito.Answers.RETURNS_DEEP_STUBS;
+import static org.mockito.Matchers.any;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+@RunWith(RobolectricTestRunner.class)
+@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
+public class SystemUpdatePreferenceControllerTest {
+
+    @Mock(answer = RETURNS_DEEP_STUBS)
+    private Context mContext;
+    @Mock
+    private UserManager mUserManager;
+    @Mock(answer = RETURNS_DEEP_STUBS)
+    private PreferenceScreen mScreen;
+
+    private SystemUpdatePreferenceController mController;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        mController = new SystemUpdatePreferenceController(mContext, mUserManager);
+    }
+
+    @Test
+    public void updateNonIndexable_bothAvailable_shouldNotUpdate() {
+        final List<String> keys = new ArrayList<>();
+        when(mUserManager.isAdminUser()).thenReturn(true);
+        when(mContext.getResources().getBoolean(
+                R.bool.config_additional_system_update_setting_enable))
+                .thenReturn(true);
+
+        mController.updateNonIndexableKeys(keys);
+
+        assertThat(keys).isEmpty();
+    }
+
+    @Test
+    public void updateNonIndexable_nothingAvailable_shouldUpdateWith2Prefs() {
+        final List<String> keys = new ArrayList<>();
+
+        mController.updateNonIndexableKeys(keys);
+
+        assertThat(keys.size()).isEqualTo(2);
+    }
+
+    @Test
+    public void displayPrefs_nothingAvailable_shouldNotDisplay() {
+        mController.displayPreference(mScreen);
+
+        verify(mScreen, times(2)).removePreference(any(Preference.class));
+    }
+
+    @Test
+    public void displayPrefs_oneAvailable_shouldDisplayOne() {
+        when(mContext.getResources().getBoolean(
+                R.bool.config_additional_system_update_setting_enable))
+                .thenReturn(true);
+
+        mController.displayPreference(mScreen);
+
+        verify(mScreen).removePreference(any(Preference.class));
+    }
+}