diff --git a/tests/unit/java/android/net/ConnectivityManagerTest.java b/tests/unit/java/android/net/ConnectivityManagerTest.java
index 591e0cc..b1b4218 100644
--- a/tests/unit/java/android/net/ConnectivityManagerTest.java
+++ b/tests/unit/java/android/net/ConnectivityManagerTest.java
@@ -46,6 +46,7 @@
 import static org.mockito.ArgumentMatchers.nullable;
 import static org.mockito.Mockito.any;
 import static org.mockito.Mockito.anyInt;
+import static org.mockito.Mockito.doCallRealMethod;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.reset;
@@ -216,6 +217,7 @@
         ConnectivityManager manager = new ConnectivityManager(mCtx, mService);
         NetworkRequest request = makeRequest(1);
         NetworkCallback callback = mock(ConnectivityManager.NetworkCallback.class);
+        doCallRealMethod().when(callback).onAvailable(any(), any(), any(), anyInt());
         Handler handler = new Handler(Looper.getMainLooper());
         ArgumentCaptor<Messenger> captor = ArgumentCaptor.forClass(Messenger.class);
 
@@ -244,6 +246,7 @@
         NetworkRequest req1 = makeRequest(1);
         NetworkRequest req2 = makeRequest(2);
         NetworkCallback callback = mock(ConnectivityManager.NetworkCallback.class);
+        doCallRealMethod().when(callback).onAvailable(any(), any(), any(), anyInt());
         Handler handler = new Handler(Looper.getMainLooper());
         ArgumentCaptor<Messenger> captor = ArgumentCaptor.forClass(Messenger.class);
 
diff --git a/tests/unit/java/android/net/nsd/NsdManagerTest.java b/tests/unit/java/android/net/nsd/NsdManagerTest.java
index b0a9b8a..370179c 100644
--- a/tests/unit/java/android/net/nsd/NsdManagerTest.java
+++ b/tests/unit/java/android/net/nsd/NsdManagerTest.java
@@ -20,12 +20,12 @@
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.fail;
 import static org.mockito.Mockito.any;
+import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.reset;
 import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.timeout;
 import static org.mockito.Mockito.verify;
-import static org.mockito.Mockito.when;
 
 import android.content.Context;
 import android.os.Handler;
@@ -66,7 +66,7 @@
         MockitoAnnotations.initMocks(this);
 
         mServiceHandler = spy(MockServiceHandler.create(mContext));
-        when(mService.getMessenger()).thenReturn(new Messenger(mServiceHandler));
+        doReturn(new Messenger(mServiceHandler)).when(mService).getMessenger();
 
         mManager = makeManager();
     }
diff --git a/tests/unit/java/android/net/util/MultinetworkPolicyTrackerTest.kt b/tests/unit/java/android/net/util/MultinetworkPolicyTrackerTest.kt
index 25aa626..9291532 100644
--- a/tests/unit/java/android/net/util/MultinetworkPolicyTrackerTest.kt
+++ b/tests/unit/java/android/net/util/MultinetworkPolicyTrackerTest.kt
@@ -74,6 +74,7 @@
         doReturn(Context.TELEPHONY_SERVICE).`when`(it)
                 .getSystemServiceName(TelephonyManager::class.java)
         doReturn(telephonyManager).`when`(it).getSystemService(Context.TELEPHONY_SERVICE)
+        doReturn(telephonyManager).`when`(it).getSystemService(TelephonyManager::class.java)
         doReturn(subscriptionManager).`when`(it)
                 .getSystemService(Context.TELEPHONY_SUBSCRIPTION_SERVICE)
         doReturn(resolver).`when`(it).contentResolver
diff --git a/tests/unit/java/com/android/server/connectivity/MultipathPolicyTrackerTest.java b/tests/unit/java/com/android/server/connectivity/MultipathPolicyTrackerTest.java
index 38f6d7f..d6bd08e 100644
--- a/tests/unit/java/com/android/server/connectivity/MultipathPolicyTrackerTest.java
+++ b/tests/unit/java/com/android/server/connectivity/MultipathPolicyTrackerTest.java
@@ -116,6 +116,7 @@
     private <T> void mockService(String serviceName, Class<T> serviceClass, T service) {
         when(mContext.getSystemServiceName(serviceClass)).thenReturn(serviceName);
         when(mContext.getSystemService(serviceName)).thenReturn(service);
+        when(mContext.getSystemService(serviceClass)).thenReturn(service);
     }
 
     @Before
diff --git a/tests/unit/java/com/android/server/connectivity/PermissionMonitorTest.java b/tests/unit/java/com/android/server/connectivity/PermissionMonitorTest.java
index ef6ed82..a329d8f 100644
--- a/tests/unit/java/com/android/server/connectivity/PermissionMonitorTest.java
+++ b/tests/unit/java/com/android/server/connectivity/PermissionMonitorTest.java
@@ -139,6 +139,7 @@
                 .thenReturn(Context.SYSTEM_CONFIG_SERVICE);
         when(mContext.getSystemService(Context.SYSTEM_CONFIG_SERVICE))
                 .thenReturn(mSystemConfigManager);
+        when(mContext.getSystemService(SystemConfigManager.class)).thenReturn(mSystemConfigManager);
         when(mSystemConfigManager.getSystemPermissionUids(anyString())).thenReturn(new int[0]);
         final Context asUserCtx = mock(Context.class, AdditionalAnswers.delegatesTo(mContext));
         doReturn(UserHandle.ALL).when(asUserCtx).getUser();
diff --git a/tests/unit/java/com/android/server/connectivity/VpnTest.java b/tests/unit/java/com/android/server/connectivity/VpnTest.java
index b725b82..a086451 100644
--- a/tests/unit/java/com/android/server/connectivity/VpnTest.java
+++ b/tests/unit/java/com/android/server/connectivity/VpnTest.java
@@ -219,19 +219,11 @@
 
         when(mContext.getPackageName()).thenReturn(TEST_VPN_PKG);
         when(mContext.getOpPackageName()).thenReturn(TEST_VPN_PKG);
-        when(mContext.getSystemServiceName(UserManager.class))
-                .thenReturn(Context.USER_SERVICE);
-        when(mContext.getSystemService(eq(Context.USER_SERVICE))).thenReturn(mUserManager);
-        when(mContext.getSystemService(eq(Context.APP_OPS_SERVICE))).thenReturn(mAppOps);
-        when(mContext.getSystemServiceName(NotificationManager.class))
-                .thenReturn(Context.NOTIFICATION_SERVICE);
-        when(mContext.getSystemService(eq(Context.NOTIFICATION_SERVICE)))
-                .thenReturn(mNotificationManager);
-        when(mContext.getSystemService(eq(Context.CONNECTIVITY_SERVICE)))
-                .thenReturn(mConnectivityManager);
-        when(mContext.getSystemServiceName(eq(ConnectivityManager.class)))
-                .thenReturn(Context.CONNECTIVITY_SERVICE);
-        when(mContext.getSystemService(eq(Context.IPSEC_SERVICE))).thenReturn(mIpSecManager);
+        mockService(UserManager.class, Context.USER_SERVICE, mUserManager);
+        mockService(AppOpsManager.class, Context.APP_OPS_SERVICE, mAppOps);
+        mockService(NotificationManager.class, Context.NOTIFICATION_SERVICE, mNotificationManager);
+        mockService(ConnectivityManager.class, Context.CONNECTIVITY_SERVICE, mConnectivityManager);
+        mockService(IpSecManager.class, Context.IPSEC_SERVICE, mIpSecManager);
         when(mContext.getString(R.string.config_customVpnAlwaysOnDisconnectedDialogComponent))
                 .thenReturn(Resources.getSystem().getString(
                         R.string.config_customVpnAlwaysOnDisconnectedDialogComponent));
@@ -259,6 +251,12 @@
                 .thenReturn(tunnelResp);
     }
 
+    private <T> void mockService(Class<T> clazz, String name, T service) {
+        doReturn(service).when(mContext).getSystemService(clazz);
+        doReturn(service).when(mContext).getSystemService(name);
+        doReturn(name).when(mContext).getSystemServiceName(clazz);
+    }
+
     private Set<Range<Integer>> rangeSet(Range<Integer> ... ranges) {
         final Set<Range<Integer>> range = new ArraySet<>();
         for (Range<Integer> r : ranges) range.add(r);
diff --git a/tests/unit/java/com/android/server/net/NetworkStatsServiceTest.java b/tests/unit/java/com/android/server/net/NetworkStatsServiceTest.java
index 0ba5f7d..da2fdf4 100644
--- a/tests/unit/java/com/android/server/net/NetworkStatsServiceTest.java
+++ b/tests/unit/java/com/android/server/net/NetworkStatsServiceTest.java
@@ -16,12 +16,16 @@
 
 package com.android.server.net;
 
+import static android.Manifest.permission.READ_NETWORK_USAGE_HISTORY;
+import static android.Manifest.permission.UPDATE_DEVICE_STATS;
 import static android.content.Intent.ACTION_UID_REMOVED;
 import static android.content.Intent.EXTRA_UID;
+import static android.content.pm.PackageManager.PERMISSION_GRANTED;
 import static android.net.ConnectivityManager.TYPE_MOBILE;
 import static android.net.ConnectivityManager.TYPE_WIFI;
 import static android.net.NetworkIdentity.OEM_PAID;
 import static android.net.NetworkIdentity.OEM_PRIVATE;
+import static android.net.NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK;
 import static android.net.NetworkStats.DEFAULT_NETWORK_ALL;
 import static android.net.NetworkStats.DEFAULT_NETWORK_NO;
 import static android.net.NetworkStats.DEFAULT_NETWORK_YES;
@@ -106,6 +110,7 @@
 import android.provider.Settings;
 import android.telephony.TelephonyManager;
 
+import androidx.annotation.Nullable;
 import androidx.test.InstrumentationRegistry;
 import androidx.test.filters.SmallTest;
 import androidx.test.runner.AndroidJUnit4;
@@ -199,6 +204,26 @@
             if (Context.TELEPHONY_SERVICE.equals(name)) return mTelephonyManager;
             return mBaseContext.getSystemService(name);
         }
+
+        @Override
+        public void enforceCallingOrSelfPermission(String permission, @Nullable String message) {
+            if (checkCallingOrSelfPermission(permission) != PERMISSION_GRANTED) {
+                super.enforceCallingOrSelfPermission(permission, message);
+            }
+        }
+
+        @Override
+        public int checkCallingOrSelfPermission(String permission) {
+            switch (permission) {
+                case PERMISSION_MAINLINE_NETWORK_STACK:
+                case READ_NETWORK_USAGE_HISTORY:
+                case UPDATE_DEVICE_STATS:
+                    return PERMISSION_GRANTED;
+                default:
+                    return super.checkCallingOrSelfPermission(permission);
+            }
+
+        }
     }
 
     private final Clock mClock = new SimpleClock(ZoneOffset.UTC) {