Fix test missed during 'Update to latest plexi'

This fix should have been part of 5631c5
diff --git a/test/com/google/enterprise/adaptor/sharepoint/SharePointUserProfileAdaptorTest.java b/test/com/google/enterprise/adaptor/sharepoint/SharePointUserProfileAdaptorTest.java
index 275e3d6..900df3a 100644
--- a/test/com/google/enterprise/adaptor/sharepoint/SharePointUserProfileAdaptorTest.java
+++ b/test/com/google/enterprise/adaptor/sharepoint/SharePointUserProfileAdaptorTest.java
@@ -5,6 +5,7 @@
 
 import com.google.enterprise.adaptor.Config;
 import com.google.enterprise.adaptor.DocId;
+import com.google.enterprise.adaptor.GroupPrincipal;
 
 import com.google.enterprise.adaptor.sharepoint.SharePointUserProfileAdaptor.UserProfileServiceClient;
 import com.google.enterprise.adaptor.sharepoint.SharePointUserProfileAdaptor.UserProfileServiceFactory;
@@ -232,7 +233,7 @@
     assertNotNull(response.getAcl().getPermitGroups());
     assertEquals(1, response.getAcl().getPermitGroups().size());
     assertTrue(response.getAcl().getPermitGroups().contains(
-        "NT AUTHORITY\\Authenticated Users"));
+        new GroupPrincipal("NT AUTHORITY\\Authenticated Users")));
     assertTrue(response.getAcl().getPermitUsers().isEmpty());
     assertTrue(response.getAcl().getDenyGroups().isEmpty());
     assertTrue(response.getAcl().getDenyUsers().isEmpty());