Make members final in TetheringService

1. Move isTetheringSupport logic from TetheringService to Tethering.
2. Small readability improvement in TetheringTest. Also change
config_tether_upstream_automatic from false to true in TetheringTest.
So TetheringTests would default run automatic select upstream flow
instead of selecting by legacy perferred network type list.

Bug: 153609486
Test: atest TetheringTest
Change-Id: I5a82a6347f62d3a7031db5c56e8e0c8530dafd8f
Merged-In: I5a82a6347f62d3a7031db5c56e8e0c8530dafd8f

4 files changed, 139 insertions, 157 deletions

diff --git a/packages/Tethering/src/com/android/networkstack/tethering/Tethering.java b/packages/Tethering/src/com/android/networkstack/tethering/Tethering.java
index d1440a7c7be9..19a8a20863d5 100644
--- a/packages/Tethering/src/com/android/networkstack/tethering/Tethering.java
+++ b/packages/Tethering/src/com/android/networkstack/tethering/Tethering.java
@@ -109,8 +109,10 @@ import android.os.RemoteCallbackList;
 import android.os.RemoteException;
 import android.os.ResultReceiver;
 import android.os.ServiceSpecificException;
+import android.os.SystemProperties;
 import android.os.UserHandle;
 import android.os.UserManager;
+import android.provider.Settings;
 import android.telephony.PhoneStateListener;
 import android.telephony.TelephonyManager;
 import android.text.TextUtils;
@@ -228,6 +230,7 @@ public class Tethering {
     private final ConnectedClientsTracker mConnectedClientsTracker;
     private final TetheringThreadExecutor mExecutor;
     private final TetheringNotificationUpdater mNotificationUpdater;
+    private final UserManager mUserManager;
     private int mActiveDataSubId = INVALID_SUBSCRIPTION_ID;
     // All the usage of mTetheringEventCallback should run in the same thread.
     private ITetheringEventCallback mTetheringEventCallback = null;
@@ -305,23 +308,24 @@ public class Tethering {
 
         mStateReceiver = new StateReceiver();
 
-        final UserManager userManager = (UserManager) mContext.getSystemService(
-                Context.USER_SERVICE);
+        mUserManager = (UserManager) mContext.getSystemService(Context.USER_SERVICE);
         mTetheringRestriction = new UserRestrictionActionListener(
-                userManager, this, mNotificationUpdater);
+                mUserManager, this, mNotificationUpdater);
         mExecutor = new TetheringThreadExecutor(mHandler);
         mActiveDataSubIdListener = new ActiveDataSubIdListener(mExecutor);
         mNetdCallback = new NetdCallback();
 
         // Load tethering configuration.
         updateConfiguration();
+
+        startStateMachineUpdaters();
     }
 
     /**
      * Start to register callbacks.
      * Call this function when tethering is ready to handle callback events.
      */
-    public void startStateMachineUpdaters() {
+    private void startStateMachineUpdaters() {
         try {
             mNetd.registerUnsolicitedEventListener(mNetdCallback);
         } catch (RemoteException e) {
@@ -779,7 +783,7 @@ public class Tethering {
 
     // TODO: Figure out how to update for local hotspot mode interfaces.
     private void sendTetherStateChangedBroadcast() {
-        if (!mDeps.isTetheringSupported()) return;
+        if (!isTetheringSupported()) return;
 
         final ArrayList<String> availableList = new ArrayList<>();
         final ArrayList<String> tetherList = new ArrayList<>();
@@ -1020,14 +1024,14 @@ public class Tethering {
 
     @VisibleForTesting
     protected static class UserRestrictionActionListener {
-        private final UserManager mUserManager;
+        private final UserManager mUserMgr;
         private final Tethering mWrapper;
         private final TetheringNotificationUpdater mNotificationUpdater;
         public boolean mDisallowTethering;
 
         public UserRestrictionActionListener(@NonNull UserManager um, @NonNull Tethering wrapper,
                 @NonNull TetheringNotificationUpdater updater) {
-            mUserManager = um;
+            mUserMgr = um;
             mWrapper = wrapper;
             mNotificationUpdater = updater;
             mDisallowTethering = false;
@@ -1037,7 +1041,7 @@ public class Tethering {
             // getUserRestrictions gets restriction for this process' user, which is the primary
             // user. This is fine because DISALLOW_CONFIG_TETHERING can only be set on the primary
             // user. See UserManager.DISALLOW_CONFIG_TETHERING.
-            final Bundle restrictions = mUserManager.getUserRestrictions();
+            final Bundle restrictions = mUserMgr.getUserRestrictions();
             final boolean newlyDisallowed =
                     restrictions.getBoolean(UserManager.DISALLOW_CONFIG_TETHERING);
             final boolean prevDisallowed = mDisallowTethering;
@@ -1988,7 +1992,7 @@ public class Tethering {
         mHandler.post(() -> {
             mTetheringEventCallbacks.register(callback, new CallbackCookie(hasListPermission));
             final TetheringCallbackStartedParcel parcel = new TetheringCallbackStartedParcel();
-            parcel.tetheringSupported = mDeps.isTetheringSupported();
+            parcel.tetheringSupported = isTetheringSupported();
             parcel.upstreamNetwork = mTetherUpstream;
             parcel.config = mConfig.toStableParcelable();
             parcel.states =
@@ -2111,6 +2115,20 @@ public class Tethering {
         }
     }
 
+    // if ro.tether.denied = true we default to no tethering
+    // gservices could set the secure setting to 1 though to enable it on a build where it
+    // had previously been turned off.
+    boolean isTetheringSupported() {
+        final int defaultVal =
+                SystemProperties.get("ro.tether.denied").equals("true") ? 0 : 1;
+        final boolean tetherSupported = Settings.Global.getInt(mContext.getContentResolver(),
+                Settings.Global.TETHER_SUPPORTED, defaultVal) != 0;
+        final boolean tetherEnabledInSettings = tetherSupported
+                && !mUserManager.hasUserRestriction(UserManager.DISALLOW_CONFIG_TETHERING);
+
+        return tetherEnabledInSettings && hasTetherableConfiguration();
+    }
+
     void dump(@NonNull FileDescriptor fd, @NonNull PrintWriter writer, @Nullable String[] args) {
         // Binder.java closes the resource for us.
         @SuppressWarnings("resource")
diff --git a/packages/Tethering/src/com/android/networkstack/tethering/TetheringService.java b/packages/Tethering/src/com/android/networkstack/tethering/TetheringService.java
index af349f2b92a2..7d012738425b 100644
--- a/packages/Tethering/src/com/android/networkstack/tethering/TetheringService.java
+++ b/packages/Tethering/src/com/android/networkstack/tethering/TetheringService.java
@@ -40,15 +40,12 @@ import android.net.TetheringRequestParcel;
 import android.net.dhcp.DhcpServerCallbacks;
 import android.net.dhcp.DhcpServingParamsParcel;
 import android.net.ip.IpServer;
-import android.net.util.SharedLog;
 import android.os.Binder;
 import android.os.HandlerThread;
 import android.os.IBinder;
 import android.os.Looper;
 import android.os.RemoteException;
 import android.os.ResultReceiver;
-import android.os.SystemProperties;
-import android.os.UserManager;
 import android.provider.Settings;
 import android.util.Log;
 
@@ -68,21 +65,14 @@ import java.io.PrintWriter;
 public class TetheringService extends Service {
     private static final String TAG = TetheringService.class.getSimpleName();
 
-    private final SharedLog mLog = new SharedLog(TAG);
     private TetheringConnector mConnector;
-    private Context mContext;
-    private TetheringDependencies mDeps;
-    private Tethering mTethering;
-    private UserManager mUserManager;
 
     @Override
     public void onCreate() {
-        mLog.mark("onCreate");
-        mDeps = getTetheringDependencies();
-        mContext = mDeps.getContext();
-        mUserManager = (UserManager) mContext.getSystemService(Context.USER_SERVICE);
-        mTethering = makeTethering(mDeps);
-        mTethering.startStateMachineUpdaters();
+        final TetheringDependencies deps = makeTetheringDependencies();
+        // The Tethering object needs a fully functional context to start, so this can't be done
+        // in the constructor.
+        mConnector = new TetheringConnector(makeTethering(deps), TetheringService.this);
     }
 
     /**
@@ -94,21 +84,10 @@ public class TetheringService extends Service {
         return new Tethering(deps);
     }
 
-    /**
-     * Create a binder connector for the system server to communicate with the tethering.
-     */
-    private synchronized IBinder makeConnector() {
-        if (mConnector == null) {
-            mConnector = new TetheringConnector(mTethering, TetheringService.this);
-        }
-        return mConnector;
-    }
-
     @NonNull
     @Override
     public IBinder onBind(Intent intent) {
-        mLog.mark("onBind");
-        return makeConnector();
+        return mConnector;
     }
 
     private static class TetheringConnector extends ITetheringConnector.Stub {
@@ -248,7 +227,7 @@ public class TetheringService extends Service {
                     listener.onResult(TETHER_ERROR_NO_CHANGE_TETHERING_PERMISSION);
                     return true;
                 }
-                if (!mService.isTetheringSupported()) {
+                if (!mTethering.isTetheringSupported()) {
                     listener.onResult(TETHER_ERROR_UNSUPPORTED);
                     return true;
                 }
@@ -266,7 +245,7 @@ public class TetheringService extends Service {
                 receiver.send(TETHER_ERROR_NO_CHANGE_TETHERING_PERMISSION, null);
                 return true;
             }
-            if (!mService.isTetheringSupported()) {
+            if (!mTethering.isTetheringSupported()) {
                 receiver.send(TETHER_ERROR_UNSUPPORTED, null);
                 return true;
             }
@@ -300,20 +279,6 @@ public class TetheringService extends Service {
         }
     }
 
-    // if ro.tether.denied = true we default to no tethering
-    // gservices could set the secure setting to 1 though to enable it on a build where it
-    // had previously been turned off.
-    private boolean isTetheringSupported() {
-        final int defaultVal =
-                SystemProperties.get("ro.tether.denied").equals("true") ? 0 : 1;
-        final boolean tetherSupported = Settings.Global.getInt(mContext.getContentResolver(),
-                Settings.Global.TETHER_SUPPORTED, defaultVal) != 0;
-        final boolean tetherEnabledInSettings = tetherSupported
-                && !mUserManager.hasUserRestriction(UserManager.DISALLOW_CONFIG_TETHERING);
-
-        return tetherEnabledInSettings && mTethering.hasTetherableConfiguration();
-    }
-
     /**
      * Check if the package is a allowed to write settings. This also accounts that such an access
      * happened.
@@ -332,87 +297,79 @@ public class TetheringService extends Service {
      * An injection method for testing.
      */
     @VisibleForTesting
-    public TetheringDependencies getTetheringDependencies() {
-        if (mDeps == null) {
-            mDeps = new TetheringDependencies() {
-                @Override
-                public NetworkRequest getDefaultNetworkRequest() {
-                    // TODO: b/147280869, add a proper system API to replace this.
-                    final NetworkRequest trackDefaultRequest = new NetworkRequest.Builder()
-                            .clearCapabilities()
-                            .addCapability(NetworkCapabilities.NET_CAPABILITY_NOT_RESTRICTED)
-                            .addCapability(NetworkCapabilities.NET_CAPABILITY_TRUSTED)
-                            .addCapability(NetworkCapabilities.NET_CAPABILITY_NOT_VPN)
-                            .addCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET)
-                            .build();
-                    return trackDefaultRequest;
-                }
-
-                @Override
-                public Looper getTetheringLooper() {
-                    final HandlerThread tetherThread = new HandlerThread("android.tethering");
-                    tetherThread.start();
-                    return tetherThread.getLooper();
-                }
+    public TetheringDependencies makeTetheringDependencies() {
+        return new TetheringDependencies() {
+            @Override
+            public NetworkRequest getDefaultNetworkRequest() {
+                // TODO: b/147280869, add a proper system API to replace this.
+                final NetworkRequest trackDefaultRequest = new NetworkRequest.Builder()
+                        .clearCapabilities()
+                        .addCapability(NetworkCapabilities.NET_CAPABILITY_NOT_RESTRICTED)
+                        .addCapability(NetworkCapabilities.NET_CAPABILITY_TRUSTED)
+                        .addCapability(NetworkCapabilities.NET_CAPABILITY_NOT_VPN)
+                        .addCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET)
+                        .build();
+                return trackDefaultRequest;
+            }
 
-                @Override
-                public boolean isTetheringSupported() {
-                    return TetheringService.this.isTetheringSupported();
-                }
+            @Override
+            public Looper getTetheringLooper() {
+                final HandlerThread tetherThread = new HandlerThread("android.tethering");
+                tetherThread.start();
+                return tetherThread.getLooper();
+            }
 
-                @Override
-                public Context getContext() {
-                    return TetheringService.this;
-                }
+            @Override
+            public Context getContext() {
+                return TetheringService.this;
+            }
 
-                @Override
-                public IpServer.Dependencies getIpServerDependencies() {
-                    return new IpServer.Dependencies() {
-                        @Override
-                        public void makeDhcpServer(String ifName, DhcpServingParamsParcel params,
-                                DhcpServerCallbacks cb) {
+            @Override
+            public IpServer.Dependencies getIpServerDependencies() {
+                return new IpServer.Dependencies() {
+                    @Override
+                    public void makeDhcpServer(String ifName, DhcpServingParamsParcel params,
+                            DhcpServerCallbacks cb) {
+                        try {
+                            final INetworkStackConnector service = getNetworkStackConnector();
+                            if (service == null) return;
+
+                            service.makeDhcpServer(ifName, params, cb);
+                        } catch (RemoteException e) {
+                            Log.e(TAG, "Fail to make dhcp server");
                             try {
-                                final INetworkStackConnector service = getNetworkStackConnector();
-                                if (service == null) return;
-
-                                service.makeDhcpServer(ifName, params, cb);
-                            } catch (RemoteException e) {
-                                Log.e(TAG, "Fail to make dhcp server");
-                                try {
-                                    cb.onDhcpServerCreated(STATUS_UNKNOWN_ERROR, null);
-                                } catch (RemoteException re) { }
-                            }
+                                cb.onDhcpServerCreated(STATUS_UNKNOWN_ERROR, null);
+                            } catch (RemoteException re) { }
                         }
-                    };
-                }
+                    }
+                };
+            }
 
-                // TODO: replace this by NetworkStackClient#getRemoteConnector after refactoring
-                // networkStackClient.
-                static final int NETWORKSTACK_TIMEOUT_MS = 60_000;
-                private INetworkStackConnector getNetworkStackConnector() {
-                    IBinder connector;
-                    try {
-                        final long before = System.currentTimeMillis();
-                        while ((connector = NetworkStack.getService()) == null) {
-                            if (System.currentTimeMillis() - before > NETWORKSTACK_TIMEOUT_MS) {
-                                Log.wtf(TAG, "Timeout, fail to get INetworkStackConnector");
-                                return null;
-                            }
-                            Thread.sleep(200);
+            // TODO: replace this by NetworkStackClient#getRemoteConnector after refactoring
+            // networkStackClient.
+            static final int NETWORKSTACK_TIMEOUT_MS = 60_000;
+            private INetworkStackConnector getNetworkStackConnector() {
+                IBinder connector;
+                try {
+                    final long before = System.currentTimeMillis();
+                    while ((connector = NetworkStack.getService()) == null) {
+                        if (System.currentTimeMillis() - before > NETWORKSTACK_TIMEOUT_MS) {
+                            Log.wtf(TAG, "Timeout, fail to get INetworkStackConnector");
+                            return null;
                         }
-                    } catch (InterruptedException e) {
-                        Log.wtf(TAG, "Interrupted, fail to get INetworkStackConnector");
-                        return null;
+                        Thread.sleep(200);
                     }
-                    return INetworkStackConnector.Stub.asInterface(connector);
+                } catch (InterruptedException e) {
+                    Log.wtf(TAG, "Interrupted, fail to get INetworkStackConnector");
+                    return null;
                 }
+                return INetworkStackConnector.Stub.asInterface(connector);
+            }
 
-                @Override
-                public BluetoothAdapter getBluetoothAdapter() {
-                    return BluetoothAdapter.getDefaultAdapter();
-                }
-            };
-        }
-        return mDeps;
+            @Override
+            public BluetoothAdapter getBluetoothAdapter() {
+                return BluetoothAdapter.getDefaultAdapter();
+            }
+        };
     }
 }
diff --git a/packages/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringServiceTest.java b/packages/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringServiceTest.java
index 7df9fc685053..3dc6a1300de5 100644
--- a/packages/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringServiceTest.java
+++ b/packages/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringServiceTest.java
@@ -83,8 +83,7 @@ public final class TetheringServiceTest {
         mTetheringConnector = mockConnector.getTetheringConnector();
         final MockTetheringService service = mockConnector.getService();
         mTethering = service.getTethering();
-        verify(mTethering).startStateMachineUpdaters();
-        when(mTethering.hasTetherableConfiguration()).thenReturn(true);
+        when(mTethering.isTetheringSupported()).thenReturn(true);
     }
 
     @After
@@ -97,7 +96,7 @@ public final class TetheringServiceTest {
         when(mTethering.tether(TEST_IFACE_NAME)).thenReturn(TETHER_ERROR_NO_ERROR);
         final TestTetheringResult result = new TestTetheringResult();
         mTetheringConnector.tether(TEST_IFACE_NAME, TEST_CALLER_PKG, TEST_ATTRIBUTION_TAG, result);
-        verify(mTethering).hasTetherableConfiguration();
+        verify(mTethering).isTetheringSupported();
         verify(mTethering).tether(TEST_IFACE_NAME);
         verifyNoMoreInteractions(mTethering);
         result.assertResult(TETHER_ERROR_NO_ERROR);
@@ -109,7 +108,7 @@ public final class TetheringServiceTest {
         final TestTetheringResult result = new TestTetheringResult();
         mTetheringConnector.untether(TEST_IFACE_NAME, TEST_CALLER_PKG, TEST_ATTRIBUTION_TAG,
                 result);
-        verify(mTethering).hasTetherableConfiguration();
+        verify(mTethering).isTetheringSupported();
         verify(mTethering).untether(TEST_IFACE_NAME);
         verifyNoMoreInteractions(mTethering);
         result.assertResult(TETHER_ERROR_NO_ERROR);
@@ -121,7 +120,7 @@ public final class TetheringServiceTest {
         final TestTetheringResult result = new TestTetheringResult();
         mTetheringConnector.setUsbTethering(true /* enable */, TEST_CALLER_PKG,
                 TEST_ATTRIBUTION_TAG, result);
-        verify(mTethering).hasTetherableConfiguration();
+        verify(mTethering).isTetheringSupported();
         verify(mTethering).setUsbTethering(true /* enable */);
         verifyNoMoreInteractions(mTethering);
         result.assertResult(TETHER_ERROR_NO_ERROR);
@@ -133,7 +132,7 @@ public final class TetheringServiceTest {
         final TetheringRequestParcel request = new TetheringRequestParcel();
         request.tetheringType = TETHERING_WIFI;
         mTetheringConnector.startTethering(request, TEST_CALLER_PKG, TEST_ATTRIBUTION_TAG, result);
-        verify(mTethering).hasTetherableConfiguration();
+        verify(mTethering).isTetheringSupported();
         verify(mTethering).startTethering(eq(request), eq(result));
         verifyNoMoreInteractions(mTethering);
     }
@@ -143,7 +142,7 @@ public final class TetheringServiceTest {
         final TestTetheringResult result = new TestTetheringResult();
         mTetheringConnector.stopTethering(TETHERING_WIFI, TEST_CALLER_PKG, TEST_ATTRIBUTION_TAG,
                 result);
-        verify(mTethering).hasTetherableConfiguration();
+        verify(mTethering).isTetheringSupported();
         verify(mTethering).stopTethering(TETHERING_WIFI);
         verifyNoMoreInteractions(mTethering);
         result.assertResult(TETHER_ERROR_NO_ERROR);
@@ -154,7 +153,7 @@ public final class TetheringServiceTest {
         final ResultReceiver result = new ResultReceiver(null);
         mTetheringConnector.requestLatestTetheringEntitlementResult(TETHERING_WIFI, result,
                 true /* showEntitlementUi */, TEST_CALLER_PKG, TEST_ATTRIBUTION_TAG);
-        verify(mTethering).hasTetherableConfiguration();
+        verify(mTethering).isTetheringSupported();
         verify(mTethering).requestLatestTetheringEntitlementResult(eq(TETHERING_WIFI),
                 eq(result), eq(true) /* showEntitlementUi */);
         verifyNoMoreInteractions(mTethering);
@@ -181,7 +180,7 @@ public final class TetheringServiceTest {
     public void testStopAllTethering() throws Exception {
         final TestTetheringResult result = new TestTetheringResult();
         mTetheringConnector.stopAllTethering(TEST_CALLER_PKG, TEST_ATTRIBUTION_TAG, result);
-        verify(mTethering).hasTetherableConfiguration();
+        verify(mTethering).isTetheringSupported();
         verify(mTethering).untetherAll();
         verifyNoMoreInteractions(mTethering);
         result.assertResult(TETHER_ERROR_NO_ERROR);
@@ -191,7 +190,7 @@ public final class TetheringServiceTest {
     public void testIsTetheringSupported() throws Exception {
         final TestTetheringResult result = new TestTetheringResult();
         mTetheringConnector.isTetheringSupported(TEST_CALLER_PKG, TEST_ATTRIBUTION_TAG, result);
-        verify(mTethering).hasTetherableConfiguration();
+        verify(mTethering).isTetheringSupported();
         verifyNoMoreInteractions(mTethering);
         result.assertResult(TETHER_ERROR_NO_ERROR);
     }
diff --git a/packages/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringTest.java b/packages/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringTest.java
index 85c2f2b984ae..b665acc2718d 100644
--- a/packages/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringTest.java
+++ b/packages/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringTest.java
@@ -485,18 +485,6 @@ public class TetheringTest {
         MockitoAnnotations.initMocks(this);
         when(mResources.getStringArray(R.array.config_tether_dhcp_range))
                 .thenReturn(new String[0]);
-        when(mResources.getStringArray(R.array.config_tether_usb_regexs))
-                .thenReturn(new String[] { "test_rndis\\d" });
-        when(mResources.getStringArray(R.array.config_tether_wifi_regexs))
-                .thenReturn(new String[]{ "test_wlan\\d" });
-        when(mResources.getStringArray(R.array.config_tether_wifi_p2p_regexs))
-                .thenReturn(new String[]{ "test_p2p-p2p\\d-.*" });
-        when(mResources.getStringArray(R.array.config_tether_bluetooth_regexs))
-                .thenReturn(new String[0]);
-        when(mResources.getStringArray(R.array.config_tether_ncm_regexs))
-                .thenReturn(new String[] { "test_ncm\\d" });
-        when(mResources.getIntArray(R.array.config_tether_upstream_types)).thenReturn(new int[0]);
-        when(mResources.getBoolean(R.bool.config_tether_upstream_automatic)).thenReturn(false);
         when(mResources.getBoolean(R.bool.config_tether_enable_legacy_dhcp_server)).thenReturn(
                 false);
         when(mNetd.interfaceGetList())
@@ -515,6 +503,7 @@ public class TetheringTest {
         mServiceContext = new TestContext(mContext);
         mContentResolver = new MockContentResolver(mServiceContext);
         mContentResolver.addProvider(Settings.AUTHORITY, new FakeSettingsProvider());
+        setTetheringSupported(true /* supported */);
         mIntents = new Vector<>();
         mBroadcastReceiver = new BroadcastReceiver() {
             @Override
@@ -525,7 +514,6 @@ public class TetheringTest {
         mServiceContext.registerReceiver(mBroadcastReceiver,
                 new IntentFilter(ACTION_TETHER_STATE_CHANGED));
         mTethering = makeTethering();
-        mTethering.startStateMachineUpdaters();
         verify(mStatsManager, times(1)).registerNetworkStatsProvider(anyString(), any());
         verify(mNetd).registerUnsolicitedEventListener(any());
         final ArgumentCaptor<PhoneStateListener> phoneListenerCaptor =
@@ -536,6 +524,31 @@ public class TetheringTest {
         mPhoneStateListener = phoneListenerCaptor.getValue();
     }
 
+    private void setTetheringSupported(final boolean supported) {
+        Settings.Global.putInt(mContentResolver, Settings.Global.TETHER_SUPPORTED,
+                supported ? 1 : 0);
+        when(mUserManager.hasUserRestriction(
+                UserManager.DISALLOW_CONFIG_TETHERING)).thenReturn(!supported);
+        // Setup tetherable configuration.
+        when(mResources.getStringArray(R.array.config_tether_usb_regexs))
+                .thenReturn(new String[] { "test_rndis\\d" });
+        when(mResources.getStringArray(R.array.config_tether_wifi_regexs))
+                .thenReturn(new String[]{ "test_wlan\\d" });
+        when(mResources.getStringArray(R.array.config_tether_wifi_p2p_regexs))
+                .thenReturn(new String[]{ "test_p2p-p2p\\d-.*" });
+        when(mResources.getStringArray(R.array.config_tether_bluetooth_regexs))
+                .thenReturn(new String[0]);
+        when(mResources.getStringArray(R.array.config_tether_ncm_regexs))
+                .thenReturn(new String[] { "test_ncm\\d" });
+        when(mResources.getIntArray(R.array.config_tether_upstream_types)).thenReturn(new int[0]);
+        when(mResources.getBoolean(R.bool.config_tether_upstream_automatic)).thenReturn(true);
+    }
+
+    private void initTetheringUpstream(UpstreamNetworkState upstreamState) {
+        when(mUpstreamNetworkMonitor.getCurrentPreferredUpstream()).thenReturn(upstreamState);
+        when(mUpstreamNetworkMonitor.selectPreferredUpstreamType(any())).thenReturn(upstreamState);
+    }
+
     private Tethering makeTethering() {
         mTetheringDependencies.reset();
         return new Tethering(mTetheringDependencies);
@@ -672,9 +685,7 @@ public class TetheringTest {
     }
 
     private void prepareUsbTethering(UpstreamNetworkState upstreamState) {
-        when(mUpstreamNetworkMonitor.getCurrentPreferredUpstream()).thenReturn(upstreamState);
-        when(mUpstreamNetworkMonitor.selectPreferredUpstreamType(any()))
-                .thenReturn(upstreamState);
+        initTetheringUpstream(upstreamState);
 
         // Emulate pressing the USB tethering button in Settings UI.
         mTethering.startTethering(createTetheringRequestParcel(TETHERING_USB), null);
@@ -700,7 +711,7 @@ public class TetheringTest {
         verify(mNetd, times(1)).interfaceGetList();
 
         // UpstreamNetworkMonitor should receive selected upstream
-        verify(mUpstreamNetworkMonitor, times(1)).selectPreferredUpstreamType(any());
+        verify(mUpstreamNetworkMonitor, times(1)).getCurrentPreferredUpstream();
         verify(mUpstreamNetworkMonitor, times(1)).setCurrentUpstream(upstreamState.network);
     }
 
@@ -872,8 +883,7 @@ public class TetheringTest {
 
         // Then 464xlat comes up
         upstreamState = buildMobile464xlatUpstreamState();
-        when(mUpstreamNetworkMonitor.selectPreferredUpstreamType(any()))
-                .thenReturn(upstreamState);
+        initTetheringUpstream(upstreamState);
 
         // Upstream LinkProperties changed: UpstreamNetworkMonitor sends EVENT_ON_LINKPROPERTIES.
         mTetheringDependencies.mUpstreamNetworkMonitorMasterSM.sendMessage(
@@ -1344,9 +1354,7 @@ public class TetheringTest {
         callback.expectOffloadStatusChanged(TETHER_HARDWARE_OFFLOAD_STOPPED);
         // 2. Enable wifi tethering.
         UpstreamNetworkState upstreamState = buildMobileDualStackUpstreamState();
-        when(mUpstreamNetworkMonitor.getCurrentPreferredUpstream()).thenReturn(upstreamState);
-        when(mUpstreamNetworkMonitor.selectPreferredUpstreamType(any()))
-                .thenReturn(upstreamState);
+        initTetheringUpstream(upstreamState);
         when(mWifiManager.startSoftAp(any(WifiConfiguration.class))).thenReturn(true);
         mTethering.interfaceStatusChanged(TEST_WLAN_IFNAME, true);
         mLooper.dispatchAll();
@@ -1723,7 +1731,7 @@ public class TetheringTest {
         final Tethering.TetherMasterSM stateMachine = (Tethering.TetherMasterSM)
                 mTetheringDependencies.mUpstreamNetworkMonitorMasterSM;
         final UpstreamNetworkState upstreamState = buildMobileIPv4UpstreamState();
-        when(mUpstreamNetworkMonitor.selectPreferredUpstreamType(any())).thenReturn(upstreamState);
+        initTetheringUpstream(upstreamState);
         stateMachine.chooseUpstreamType(true);
 
         verify(mUpstreamNetworkMonitor, times(1)).setCurrentUpstream(eq(upstreamState.network));
@@ -1735,7 +1743,7 @@ public class TetheringTest {
         final Tethering.TetherMasterSM stateMachine = (Tethering.TetherMasterSM)
                 mTetheringDependencies.mUpstreamNetworkMonitorMasterSM;
         final UpstreamNetworkState upstreamState = buildMobileIPv4UpstreamState();
-        when(mUpstreamNetworkMonitor.selectPreferredUpstreamType(any())).thenReturn(upstreamState);
+        initTetheringUpstream(upstreamState);
         stateMachine.chooseUpstreamType(true);
 
         stateMachine.handleUpstreamNetworkMonitorCallback(EVENT_ON_CAPABILITIES, upstreamState);