VpnPreferenceControllerTest converted to JUnit

global settings string set to guarantee pre-test environment.
PreferenceManager and PreferenceScreen instantiated instead of mocks,
and mock preference inserted with getKey function overridden.

Bug: 176821216
Test: atest -c VpnPreferenceControllerTest
Change-Id: I94a881df13d1b35126de10f561d657136e4fed7f
Merged-In: I94a881df13d1b35126de10f561d657136e4fed7f
(cherry picked from commit 7361f8557c)

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

@@ -0,0 +1,135 @@
+/*
+ * Copyright (C) 2017 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 androidx.lifecycle.Lifecycle.Event.ON_PAUSE;
+import static androidx.lifecycle.Lifecycle.Event.ON_RESUME;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.content.Context;
+import android.net.ConnectivityManager;
+import android.net.NetworkRequest;
+import android.net.VpnManager;
+import android.os.Looper;
+import android.os.UserHandle;
+import android.provider.Settings;
+import android.provider.SettingsSlicesContract;
+
+import androidx.lifecycle.LifecycleOwner;
+import androidx.preference.Preference;
+import androidx.preference.PreferenceManager;
+import androidx.preference.PreferenceScreen;
+import androidx.test.annotation.UiThreadTest;
+import androidx.test.core.app.ApplicationProvider;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import com.android.internal.net.VpnConfig;
+import com.android.settingslib.core.lifecycle.Lifecycle;
+
+import org.junit.Before;
+import org.junit.Ignore;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+
+@RunWith(AndroidJUnit4.class)
+public class VpnPreferenceControllerTest {
+    private static final String VPN_PREFERENCE_KEY = "vpn_settings";
+
+    private Context mContext;
+    @Mock
+    private ConnectivityManager mConnectivityManager;
+    @Mock
+    private VpnManager mVpnManager;
+    private PreferenceScreen mScreen;
+    @Mock
+    private Preference mPreference;
+    private VpnPreferenceController mController;
+    private Lifecycle mLifecycle;
+    private LifecycleOwner mLifecycleOwner;
+
+    @Before
+    @UiThreadTest
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        mContext = spy(ApplicationProvider.getApplicationContext());
+        when(mContext.getSystemService(Context.CONNECTIVITY_SERVICE))
+                .thenReturn(mConnectivityManager);
+        when(mContext.getSystemService(VpnManager.class)).thenReturn(mVpnManager);
+
+        if (Looper.myLooper() == null) {
+            Looper.prepare();
+        }
+        PreferenceManager preferenceManager = new PreferenceManager(mContext);
+        mScreen = preferenceManager.createPreferenceScreen(mContext);
+        when(mPreference.getKey()).thenReturn(VPN_PREFERENCE_KEY);
+        mScreen.addPreference(mPreference);
+
+        mController = spy(new VpnPreferenceController(mContext));
+        mLifecycleOwner = () -> mLifecycle;
+        mLifecycle = new Lifecycle(mLifecycleOwner);
+        mLifecycle.addObserver(mController);
+    }
+
+    @Test
+    public void displayPreference_available_shouldSetDependency() {
+        Settings.Global.putString(mContext.getContentResolver(),
+                Settings.Global.AIRPLANE_MODE_TOGGLEABLE_RADIOS, "");
+        VpnPreferenceController controller = spy(new VpnPreferenceController(mContext));
+        doReturn(true).when(controller).isAvailable();
+
+        controller.displayPreference(mScreen);
+
+        verify(mPreference).setDependency(SettingsSlicesContract.KEY_AIRPLANE_MODE);
+    }
+
+    @Test
+    // TODO(b/176821216) re-enable this test once VpnPreferenceController is edited to notify
+    // the preference of legacy VPNs
+    @Ignore
+    public void goThroughLifecycle_shouldRegisterUnregisterListener() {
+        doReturn(true).when(mController).isAvailable();
+
+        mLifecycle.handleLifecycleEvent(ON_RESUME);
+        verify(mConnectivityManager).registerNetworkCallback(
+                any(NetworkRequest.class), any(ConnectivityManager.NetworkCallback.class));
+
+        mLifecycle.handleLifecycleEvent(ON_PAUSE);
+        verify(mConnectivityManager).unregisterNetworkCallback(
+                any(ConnectivityManager.NetworkCallback.class));
+    }
+
+    @Test
+    public void getNameForVpnConfig_legacyVPNConfig_shouldSetSummaryToConnected() {
+        final VpnConfig config = new VpnConfig();
+        config.legacy = true;
+        final VpnPreferenceController controller =
+                new VpnPreferenceController(ApplicationProvider.getApplicationContext());
+
+        final String summary = controller.getNameForVpnConfig(config, UserHandle.CURRENT);
+
+        assertThat(summary).isEqualTo("Connected");
+    }
+}