diff --git a/tests/unit/java/android/net/ConnectivityManagerTest.java b/tests/unit/java/android/net/ConnectivityManagerTest.java
index c804e10..b8cd3f6 100644
--- a/tests/unit/java/android/net/ConnectivityManagerTest.java
+++ b/tests/unit/java/android/net/ConnectivityManagerTest.java
@@ -44,6 +44,7 @@
 import static org.mockito.ArgumentMatchers.anyBoolean;
 import static org.mockito.ArgumentMatchers.eq;
 import static org.mockito.ArgumentMatchers.nullable;
+import static org.mockito.Mockito.CALLS_REAL_METHODS;
 import static org.mockito.Mockito.any;
 import static org.mockito.Mockito.anyInt;
 import static org.mockito.Mockito.mock;
@@ -215,7 +216,8 @@
     public void testCallbackRelease() throws Exception {
         ConnectivityManager manager = new ConnectivityManager(mCtx, mService);
         NetworkRequest request = makeRequest(1);
-        NetworkCallback callback = mock(ConnectivityManager.NetworkCallback.class);
+        NetworkCallback callback = mock(ConnectivityManager.NetworkCallback.class,
+                CALLS_REAL_METHODS);
         Handler handler = new Handler(Looper.getMainLooper());
         ArgumentCaptor<Messenger> captor = ArgumentCaptor.forClass(Messenger.class);
 
@@ -243,7 +245,8 @@
         ConnectivityManager manager = new ConnectivityManager(mCtx, mService);
         NetworkRequest req1 = makeRequest(1);
         NetworkRequest req2 = makeRequest(2);
-        NetworkCallback callback = mock(ConnectivityManager.NetworkCallback.class);
+        NetworkCallback callback = mock(ConnectivityManager.NetworkCallback.class,
+                CALLS_REAL_METHODS);
         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..78c8fa4 100644
--- a/tests/unit/java/android/net/util/MultinetworkPolicyTrackerTest.kt
+++ b/tests/unit/java/android/net/util/MultinetworkPolicyTrackerTest.kt
@@ -45,6 +45,7 @@
 import org.mockito.ArgumentMatchers.argThat
 import org.mockito.ArgumentMatchers.eq
 import org.mockito.Mockito.any
+import org.mockito.Mockito.doCallRealMethod
 import org.mockito.Mockito.doReturn
 import org.mockito.Mockito.mock
 import org.mockito.Mockito.times
@@ -74,6 +75,10 @@
         doReturn(Context.TELEPHONY_SERVICE).`when`(it)
                 .getSystemServiceName(TelephonyManager::class.java)
         doReturn(telephonyManager).`when`(it).getSystemService(Context.TELEPHONY_SERVICE)
+        if (it.getSystemService(TelephonyManager::class.java) == null) {
+            // Test is using mockito extended
+            doCallRealMethod().`when`(it).getSystemService(TelephonyManager::class.java)
+        }
         doReturn(subscriptionManager).`when`(it)
                 .getSystemService(Context.TELEPHONY_SUBSCRIPTION_SERVICE)
         doReturn(resolver).`when`(it).contentResolver