Migrate PaymentSettings to DashboardFragment

- Move preference related logic to controllers.
- Add some test cases for controllers.

Test: manual
Test: make RunSettingsRoboTests -j ROBOTEST_FILTER=com.android.settings.nfc
      make RunSettingsRoboTests -j ROBOTEST_FILTER=com.android.settings.core
      atest SettingsGatewayTest UniquePreferenceTest
Change-Id: I061a194c170f63fab51974f26c24be43d67d6f6f

tests/robotests/src/com/android/settings/nfc/NfcPaymentPreferenceControllerTest.java

@@ -0,0 +1,150 @@
+/*
+ * 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.nfc;
+
+import static com.google.common.truth.Truth.assertThat;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.content.Context;
+import android.content.pm.PackageManager;
+
+import com.android.settings.R;
+import com.android.settings.nfc.PaymentBackend.PaymentAppInfo;
+import com.android.settings.testutils.SettingsRobolectricTestRunner;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.RuntimeEnvironment;
+
+import java.util.ArrayList;
+
+import androidx.preference.PreferenceScreen;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+public class NfcPaymentPreferenceControllerTest {
+
+    private static final String PREF_KEY = PaymentSettingsTest.PAYMENT_KEY;
+
+    @Mock
+    private PaymentBackend mPaymentBackend;
+    @Mock
+    private PreferenceScreen mScreen;
+    @Mock
+    private PackageManager mManager;
+
+    private Context mContext;
+    private NfcPaymentPreference mPreference;
+    private NfcPaymentPreferenceController mController;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        mContext = spy(RuntimeEnvironment.application);
+        when(mContext.getPackageManager()).thenReturn(mManager);
+        mController = new NfcPaymentPreferenceController(mContext, PREF_KEY);
+        mPreference = spy(new NfcPaymentPreference(mContext, null));
+        when(mScreen.findPreference(PREF_KEY)).thenReturn(mPreference);
+    }
+
+    @Test
+    public void getAvailabilityStatus_noNFC_DISABLED() {
+        when(mManager.hasSystemFeature(PackageManager.FEATURE_NFC)).thenReturn(false);
+
+        assertThat(mController.getAvailabilityStatus())
+                .isNotEqualTo(NfcPaymentPreferenceController.AVAILABLE);
+    }
+
+    @Test
+    public void getAvailabilityStatus_noPaymentApps_DISABLED() {
+        when(mManager.hasSystemFeature(PackageManager.FEATURE_NFC)).thenReturn(true);
+        mController.setPaymentBackend(mPaymentBackend);
+        when(mPaymentBackend.getPaymentAppInfos()).thenReturn(null);
+
+        assertThat(mController.getAvailabilityStatus())
+                .isNotEqualTo(NfcPaymentPreferenceController.AVAILABLE);
+
+        when(mPaymentBackend.getPaymentAppInfos()).thenReturn(new ArrayList<>());
+
+        assertThat(mController.getAvailabilityStatus())
+                .isNotEqualTo(NfcPaymentPreferenceController.AVAILABLE);
+    }
+
+    @Test
+    public void getAvailabilityStatus_hasPaymentApps_AVAILABLE() {
+        when(mManager.hasSystemFeature(PackageManager.FEATURE_NFC)).thenReturn(true);
+        mController.setPaymentBackend(mPaymentBackend);
+        final ArrayList<PaymentAppInfo> appInfos = new ArrayList<>();
+        appInfos.add(new PaymentAppInfo());
+        when(mPaymentBackend.getPaymentAppInfos()).thenReturn(appInfos);
+
+        assertThat(mController.getAvailabilityStatus())
+                .isEqualTo(NfcPaymentPreferenceController.AVAILABLE);
+    }
+
+    @Test
+    public void onStart_shouldRegisterCallback() {
+        mController.setPaymentBackend(mPaymentBackend);
+
+        mController.onStart();
+
+        verify(mPaymentBackend).registerCallback(mController);
+    }
+
+    @Test
+    public void onStop_shouldUnregisterCallback() {
+        mController.setPaymentBackend(mPaymentBackend);
+        mController.onStart();
+
+        mController.onStop();
+
+        verify(mPaymentBackend).unregisterCallback(mController);
+    }
+
+    @Test
+    public void displayPreference_shouldInitialize() {
+        mController.setPaymentBackend(mPaymentBackend);
+
+        mController.displayPreference(mScreen);
+
+        verify(mPreference).initialize(mController);
+    }
+
+    @Test
+    public void onPaymentAppsChanged_shouldRefreshSummary() {
+        mController.setPaymentBackend(mPaymentBackend);
+        mController.displayPreference(mScreen);
+        when(mPaymentBackend.getDefaultApp()).thenReturn(null);
+
+        mController.onPaymentAppsChanged();
+
+        assertThat(mPreference.getSummary())
+                .isEqualTo(mContext.getText(R.string.nfc_payment_default_not_set));
+
+        final PaymentAppInfo appInfo = new PaymentAppInfo();
+        appInfo.label = "test label";
+        when(mPaymentBackend.getDefaultApp()).thenReturn(appInfo);
+
+        mController.onPaymentAppsChanged();
+
+        assertThat(mPreference.getSummary()).isEqualTo(appInfo.label);
+    }
+}