Mock UserManager.class for WifiSettingsTest

Bug: 214938188
Test: manual test
make RunSettingsRoboTests ROBOTEST_FILTER=WifiSettingsTest

Change-Id: I1b8faba6348b6dfddbd7eb6ccfaa35ca32366c91
diff --git a/tests/robotests/src/com/android/settings/wifi/WifiSettingsTest.java b/tests/robotests/src/com/android/settings/wifi/WifiSettingsTest.java
index d442d4e..c83ec49 100644
--- a/tests/robotests/src/com/android/settings/wifi/WifiSettingsTest.java
+++ b/tests/robotests/src/com/android/settings/wifi/WifiSettingsTest.java
@@ -60,7 +60,6 @@
 import com.android.wifitrackerlib.WifiPickerTracker;
 
 import org.junit.Before;
-import org.junit.Ignore;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.mockito.Mock;
@@ -71,7 +70,6 @@
 import org.robolectric.shadows.ShadowToast;
 
 @RunWith(RobolectricTestRunner.class)
-@Ignore
 public class WifiSettingsTest {
 
     private static final int NUM_NETWORKS = 4;
@@ -94,6 +92,7 @@
     public void setUp() {
         MockitoAnnotations.initMocks(this);
         mContext = spy(RuntimeEnvironment.application);
+        when(mContext.getSystemService(UserManager.class)).thenReturn(mock(UserManager.class));
 
         mWifiSettings = spy(new WifiSettings());
         doReturn(mContext).when(mWifiSettings).getContext();