test(shared_user_context): fix positional args warning

Using positional arguments in functional tests has been deprecated

spec/controllers/support/shared_user_context.rb

@@ -95,18 +95,22 @@ RSpec.shared_context :shared_user_context do
     #
     expect_any_instance_of(described_class).to receive(action).and_return(ActionDispatch::IntegrationTest.new(200))
     expect_any_instance_of(described_class).to receive(:render).and_return(nil)
-    send(method, action, *args)
+    send(method, action, reduce_params(*args))
     expect(response.status).to eq 200
   end
 
   def reject(user_to_signin, method, action, *args)
     sign_in user_to_signin if user_to_signin
-    send(method, action, *args)
+    send(method, action, reduce_params(*args))
     expect(response.status).to eq 302
   end
 
   alias_method :redirects_to, :reject
 
+  def reduce_params(*args)
+    { params: args.reduce({}, :merge) }
+  end
+
   def fix_args( *args)
     replacements = {
         __our_np: nonprofit.id,