[Testing] To migration NetworkScorerPickerPreferenceControllerTest

1. Use AndroidJunit4 instead of RobolectricTestRunner
2. Use ApplicationProvider instead of RuntimeEnvironment to get context
3. Change Copy Right
4. Add a function which loads the Settings Resource.

Diff: https://diff.googleplex.com/#key=81Ufa1AWkLAi
Bug: 172047348
Test: atest -c NetworkScorerPickerPreferenceControllerTest
Change-Id: I9c1a4f957b92ab572eadbd8a0804bdc83608230b

tests/unit/src/com/android/settings/network/NetworkScorerPickerPreferenceControllerTest.java

@@ -0,0 +1,148 @@
+/*
+ * Copyright (C) 2020 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.network;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.content.ComponentName;
+import android.content.Context;
+import android.net.NetworkScoreManager;
+import android.net.NetworkScorerAppData;
+
+import androidx.preference.Preference;
+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 java.util.Collections;
+
+@RunWith(AndroidJUnit4.class)
+public class NetworkScorerPickerPreferenceControllerTest {
+
+    private static final String TEST_SCORER_PACKAGE = "Test Package";
+    private static final String TEST_SCORER_CLASS = "Test Class";
+    private static final String TEST_SCORER_LABEL = "Test Label";
+
+    private Context mContext;
+    @Mock
+    private NetworkScoreManager mNetworkScorer;
+
+    private NetworkScorerPickerPreferenceController mController;
+
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        mContext = spy(ApplicationProvider.getApplicationContext());
+        doReturn(mNetworkScorer).when(mContext).getSystemService(Context.NETWORK_SCORE_SERVICE);
+
+        mController = new NetworkScorerPickerPreferenceController(mContext, "test_key");
+    }
+
+    @Test
+    public void testIsAvailable_shouldAlwaysReturnTrue() {
+        assertThat(mController.isAvailable()).isTrue();
+    }
+
+    @Test
+    public void updateState_preferenceSetSummaryAsActiveScorerLabel() {
+
+        ComponentName scorer = new ComponentName(TEST_SCORER_PACKAGE, TEST_SCORER_CLASS);
+
+        NetworkScorerAppData scorerAppData = new NetworkScorerAppData(
+                0, scorer, TEST_SCORER_LABEL, null /* enableUseOpenWifiActivity */,
+                null /* networkAvailableNotificationChannelId */);
+
+        when(mNetworkScorer.getAllValidScorers())
+                .thenReturn(Collections.singletonList(scorerAppData));
+
+        when(mNetworkScorer.getActiveScorer()).thenReturn(scorerAppData);
+
+        Preference preference = mock(Preference.class);
+
+        mController.updateState(preference);
+
+        verify(preference).setSummary(TEST_SCORER_LABEL);
+    }
+
+    @Test
+    public void updateState_scorersAvailable_noActiveScorer_preferenceSetSummaryToNone() {
+        ComponentName scorer = new ComponentName(TEST_SCORER_PACKAGE, TEST_SCORER_CLASS);
+        NetworkScorerAppData scorerAppData = new NetworkScorerAppData(
+                0, scorer, TEST_SCORER_LABEL, null /* enableUseOpenWifiActivity */,
+                null /* networkAvailableNotificationChannelId */);
+        when(mNetworkScorer.getAllValidScorers())
+                .thenReturn(Collections.singletonList(scorerAppData));
+        when(mNetworkScorer.getActiveScorer()).thenReturn(null);
+
+        Preference preference = mock(Preference.class);
+
+        mController.updateState(preference);
+
+        Context context = ApplicationProvider.getApplicationContext();
+
+        verify(preference).setSummary(
+                resourceString("network_scorer_picker_none_preference"));
+    }
+
+    @Test
+    public void updateState_scorersAvailable_preferenceEnabled() {
+        ComponentName scorer = new ComponentName(TEST_SCORER_PACKAGE, TEST_SCORER_CLASS);
+        NetworkScorerAppData scorerAppData = new NetworkScorerAppData(
+                0, scorer, TEST_SCORER_LABEL, null /* enableUseOpenWifiActivity */,
+                null /* networkAvailableNotificationChannelId */);
+        when(mNetworkScorer.getAllValidScorers())
+                .thenReturn(Collections.singletonList(scorerAppData));
+
+        Preference preference = mock(Preference.class);
+
+        mController.updateState(preference);
+
+        verify(preference).setEnabled(true);
+    }
+
+    @Test
+    public void updateState_noScorersAvailable_preferenceDisabled() {
+        when(mNetworkScorer.getAllValidScorers())
+                .thenReturn(Collections.emptyList());
+        Preference preference = mock(Preference.class);
+
+        mController.updateState(preference);
+
+        verify(preference).setEnabled(false);
+        verify(preference).setSummary(null);
+    }
+
+    public int resourceId(String type, String name) {
+        return mContext.getResources().getIdentifier(name, type, mContext.getPackageName());
+    }
+
+    public String resourceString(String name) {
+        return mContext.getResources().getString(resourceId("string", name));
+    }
+}