Add a FakeSettingsProvider and use it in ConnectivityServiceTest.

This class makes it easier to test code that uses Settings:

1. Real device or emulator settings don't affect the code under
   test; all settings always start off empty.
2. It's possible to change settings from the test without
   affecting system settings.
3. No changes are needed to the code under test. The changes to
   the tests are simple: just add a fake ContentResolver to
   whatever mock Context is already used by the test, and make
   that ContentResolver use the fake provider.

Bug: 23113288
Change-Id: I5e7e5a87571444ae49ccf551705620675a36cd17

services/tests/servicestests/src/com/android/server/ConnectivityServiceTest.java

@@ -26,6 +26,7 @@ import static org.mockito.Mockito.mock;
 
 import android.app.PendingIntent;
 import android.content.BroadcastReceiver;
+import android.content.ContentResolver;
 import android.content.Context;
 import android.content.ContextWrapper;
 import android.content.Intent;
@@ -61,12 +62,15 @@ import android.os.Messenger;
 import android.os.MessageQueue.IdleHandler;
 import android.os.Process;
 import android.os.SystemClock;
+import android.provider.Settings;
 import android.test.AndroidTestCase;
+import android.test.mock.MockContentResolver;
 import android.test.suitebuilder.annotation.LargeTest;
 import android.test.suitebuilder.annotation.SmallTest;
 import android.util.Log;
 import android.util.LogPrinter;
 
+import com.android.internal.util.FakeSettingsProvider;
 import com.android.internal.util.WakeupMessage;
 import com.android.server.connectivity.NetworkAgentInfo;
 import com.android.server.connectivity.NetworkMonitor;
@@ -118,8 +122,12 @@ public class ConnectivityServiceTest extends AndroidTestCase {
     }
 
     private class MockContext extends BroadcastInterceptingContext {
+        private final MockContentResolver mContentResolver;
+
         MockContext(Context base) {
             super(base);
+            mContentResolver = new MockContentResolver();
+            mContentResolver.addProvider(Settings.AUTHORITY, new FakeSettingsProvider());
         }
 
         @Override
@@ -135,10 +143,15 @@ public class ConnectivityServiceTest extends AndroidTestCase {
         }
 
         @Override
-        public Object getSystemService (String name) {
+        public Object getSystemService(String name) {
             if (name == Context.CONNECTIVITY_SERVICE) return mCm;
             return super.getSystemService(name);
         }
+
+        @Override
+        public ContentResolver getContentResolver() {
+            return mContentResolver;
+        }
     }
 
     /**