[Testing] Use AndroidJUnit4 instead in DataConnectivityListenerTest

1. Use AndroidJunit4 instead of RobolectricTestRunner
2. Use ApplicationProvider instead of RuntimeEnvironment to get context

Bug: 162048313
Test: atest -c DataConnectivityListenerTest
Change-Id: I8f05ac7f5f14cb2b990da137099a22e4a89fcc37

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

@@ -0,0 +1,126 @@
+/*
+ * 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 org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+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.Network;
+import android.net.NetworkCapabilities;
+import android.net.NetworkRequest;
+import android.os.Handler;
+
+import androidx.test.core.app.ApplicationProvider;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import com.android.settings.network.telephony.DataConnectivityListener;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+
+@RunWith(AndroidJUnit4.class)
+public class DataConnectivityListenerTest {
+    @Mock
+    private DataConnectivityListener.Client mClient;
+    @Mock
+    private ConnectivityManager mConnectivityManager;
+    @Mock
+    private Network mActiveNetwork;
+
+    private Context mContext;
+    private DataConnectivityListener mListener;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        mContext = spy(ApplicationProvider.getApplicationContext());
+        when(mContext.getSystemService(ConnectivityManager.class)).thenReturn(mConnectivityManager);
+        when(mConnectivityManager.getActiveNetwork()).thenReturn(mActiveNetwork);
+        mListener = new DataConnectivityListener(mContext, mClient);
+    }
+
+    @Test
+    public void registerNetworkCallback_listenerNotStart_doesNotRegister() {
+        verify(mConnectivityManager, never()).registerNetworkCallback(any(NetworkRequest.class),
+                any(ConnectivityManager.NetworkCallback.class), any(Handler.class));
+    }
+
+    @Test
+    public void registerNetworkCallback_listenerStart_doesRegister() {
+        mListener.start();
+        verify(mConnectivityManager).registerNetworkCallback(any(NetworkRequest.class),
+                eq(mListener), any(Handler.class));
+    }
+
+    @Test
+    public void onCapabilitiesChanged_notActiveNetwork_noCallback() {
+        Network changedNetwork = mock(Network.class);
+
+        mListener.onCapabilitiesChanged(changedNetwork, null);
+
+        verify(mClient, never()).onDataConnectivityChange();
+    }
+
+    @Test
+    public void onCapabilitiesChanged_activeNetwork_onDataConnectivityChangeFires() {
+        mListener.onCapabilitiesChanged(mActiveNetwork, null);
+
+        verify(mClient).onDataConnectivityChange();
+    }
+
+    @Test
+    public void onLosing_notActiveNetwork_onDataConnectivityChangeFires() {
+        Network changedNetwork = mock(Network.class);
+
+        mListener.onLosing(changedNetwork, 500);
+
+        verify(mClient).onDataConnectivityChange();
+    }
+
+    @Test
+    public void onLosing_activeNetwork_onDataConnectivityChangeFires() {
+        mListener.onLosing(mActiveNetwork, 500);
+
+        verify(mClient).onDataConnectivityChange();
+    }
+
+    @Test
+    public void onLost_notActiveNetwork_onDataConnectivityChangeFires() {
+        Network changedNetwork = mock(Network.class);
+
+        mListener.onLost(changedNetwork);
+
+        verify(mClient).onDataConnectivityChange();
+    }
+
+    @Test
+    public void onLost_activeNetwork_onDataConnectivityChangeFires() {
+        mListener.onLost(mActiveNetwork);
+
+        verify(mClient).onDataConnectivityChange();
+    }
+}