Add PreferenceController for support tile in homepage.

Change-Id: I8fe93456a761382513c07ff85c858ded30f599fc
Fixes: 116875332
Test: robotests

tests/robotests/src/com/android/settings/support/SupportPreferenceControllerTest.java

@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2018 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.support;
+
+import static com.android.settings.core.BasePreferenceController.AVAILABLE;
+import static com.android.settings.core.BasePreferenceController.UNSUPPORTED_ON_DEVICE;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.Mockito.verify;
+
+import android.app.Activity;
+
+import androidx.preference.Preference;
+
+import com.android.settings.testutils.FakeFeatureFactory;
+import com.android.settings.testutils.SettingsRobolectricTestRunner;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.Robolectric;
+import org.robolectric.util.ReflectionHelpers;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+public class SupportPreferenceControllerTest {
+
+
+    private Activity mActivity;
+    private FakeFeatureFactory mFeatureFactory;
+    private Preference mPreference;
+
+    @Before
+    public void setUp() {
+        mActivity = Robolectric.setupActivity(Activity.class);
+        mFeatureFactory = FakeFeatureFactory.setupForTest();
+        mPreference = new Preference(mActivity);
+        mPreference.setKey("test_key");
+    }
+
+    @Test
+    public void getAvailability_noSupport_unavailable() {
+        ReflectionHelpers.setField(mFeatureFactory, "supportFeatureProvider", null);
+        assertThat(new SupportPreferenceController(mActivity, "test_key").getAvailabilityStatus())
+                .isEqualTo(UNSUPPORTED_ON_DEVICE);
+    }
+
+    @Test
+    public void getAvailability_hasSupport_available() {
+        assertThat(new SupportPreferenceController(mActivity, "test_key").getAvailabilityStatus())
+                .isEqualTo(AVAILABLE);
+    }
+
+    @Test
+    public void handlePreferenceTreeClick_shouldLaunchSupport() {
+        final SupportPreferenceController controller = new SupportPreferenceController(mActivity,
+                mPreference.getKey());
+        controller.setActivity(mActivity);
+
+        assertThat(controller.handlePreferenceTreeClick(mPreference)).isTrue();
+        verify(mFeatureFactory.supportFeatureProvider).startSupport(mActivity);
+    }
+
+}