Fix the Robolectric Tests Failures

- The ShadowWifiManager class is not working as expected
  - The getSystemService(WifiManager.class) return null when testing

- Use Mockito class instead of Shadow class

Bug: 214906101
Bug: 214938188
Test: manual test
make RunSettingsRoboTests ROBOTEST_FILTER=AllInOneTetherSettingsTest
make RunSettingsRoboTests ROBOTEST_FILTER=WifiTetherSettingsTest

Change-Id: Ic54af8524fbff1b6ac916ca8e1bcac52f413663a

tests/robotests/src/com/android/settings/AllInOneTetherSettingsTest.java

@@ -35,6 +35,7 @@ import android.content.Context;
 import android.net.ConnectivityManager;
 import android.net.TetheringManager;
 import android.net.wifi.SoftApConfiguration;
+import android.net.wifi.WifiManager;
 import android.os.UserHandle;
 import android.os.UserManager;
 import android.util.FeatureFlagUtils;
@@ -43,27 +44,23 @@ import androidx.preference.PreferenceGroup;
 import androidx.preference.PreferenceScreen;
 
 import com.android.settings.core.FeatureFlags;
-import com.android.settings.testutils.shadow.ShadowWifiManager;
 import com.android.settings.wifi.tether.WifiTetherAutoOffPreferenceController;
 import com.android.settings.wifi.tether.WifiTetherSecurityPreferenceController;
 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;
 import org.robolectric.RobolectricTestRunner;
 import org.robolectric.RuntimeEnvironment;
-import org.robolectric.annotation.Config;
 import org.robolectric.util.ReflectionHelpers;
 
 import java.util.ArrayList;
 import java.util.List;
 
 @RunWith(RobolectricTestRunner.class)
-@Config(shadows = {ShadowWifiManager.class})
 public class AllInOneTetherSettingsTest {
     private static final String[] WIFI_REGEXS = {"wifi_regexs"};
     private static final String[] USB_REGEXS = {"usb_regexs"};
@@ -73,6 +70,8 @@ public class AllInOneTetherSettingsTest {
     private Context mContext;
     private AllInOneTetherSettings mAllInOneTetherSettings;
 
+    @Mock
+    private WifiManager mWifiManager;
     @Mock
     private ConnectivityManager mConnectivityManager;
     @Mock
@@ -91,6 +90,7 @@ public class AllInOneTetherSettingsTest {
         mContext = spy(RuntimeEnvironment.application);
 
         MockitoAnnotations.initMocks(this);
+        doReturn(mWifiManager).when(mContext).getSystemService(WifiManager.class);
         doReturn(mConnectivityManager)
                 .when(mContext).getSystemService(Context.CONNECTIVITY_SERVICE);
         doReturn(mTetheringManager)
@@ -178,7 +178,6 @@ public class AllInOneTetherSettingsTest {
     }
 
     @Test
-    @Ignore
     public void createPreferenceControllers_hasAutoOffPreference() {
         assertThat(mAllInOneTetherSettings.createPreferenceControllers(mContext)
                 .stream()