Since the authentication provider has changed

Since the authentication provider has changed, this change was
necessary in order to ensure that the two tests which failed without
it, in spec/requests/announcements_spec.rb, continue to pass.

Author: dotemacs

spec/requests/announcements_spec.rb

@@ -9,7 +9,9 @@
     ).to receive(:require_user!).and_return(true)
 
     allow_any_instance_of(ServicesController).to receive(:services).and_return([])
-    allow_any_instance_of(PermissionsController).to receive(:current_user).and_return(current_user)
+
+    # Mock CognitoHelper which is the source of current_user method
+    allow_any_instance_of(CognitoHelper).to receive(:current_user).and_return(current_user)
   end
 
   describe 'when there are no announcements' do