Merge "Add unit test for NetworkStatsSubscriptionsMonitor" into rvc-dev am: 32f8a56636 am: d6758e2643 am: 2acbd72f5e am: ddfa3ef0d6

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11788484

Change-Id: I8a039b0c164e51ed9054d229f52ece259b894b63

services/core/java/com/android/server/net/NetworkStatsSubscriptionsMonitor.java

@@ -28,6 +28,7 @@ import android.telephony.TelephonyManager;
 import android.text.TextUtils;
 import android.util.Log;
 
+import com.android.internal.annotations.VisibleForTesting;
 import com.android.internal.util.CollectionUtils;
 
 import java.util.ArrayList;
@@ -38,8 +39,6 @@ import java.util.concurrent.Executor;
 /**
  * Helper class that watches for events that are triggered per subscription.
  */
-// TODO (b/152176562): Write tests to verify subscription changes generate corresponding
-//  register/unregister calls.
 public class NetworkStatsSubscriptionsMonitor extends
         SubscriptionManager.OnSubscriptionsChangedListener {
 
@@ -207,5 +206,10 @@ public class NetworkStatsSubscriptionsMonitor extends
             mLastCollapsedRatType = collapsedRatType;
             mMonitor.mDelegate.onCollapsedRatTypeChanged(mSubscriberId, mLastCollapsedRatType);
         }
+
+        @VisibleForTesting
+        public int getSubId() {
+            return mSubId;
+        }
     }
 }