Confirm! is deprecated and only redirects to confirm now in devise 3.5

spec/controllers/user_confirmations_controller_spec.rb

@@ -11,7 +11,7 @@ describe UserConfirmationsController, type: :controller do
 
   before do
     @request.env["devise.mapping"] = Devise.mappings[:spree_user]
-    confirmed_user.confirm!
+    confirmed_user.confirm
   end
 
   context "confirming a user" do

spec/models/spree/user_spec.rb

@@ -109,7 +109,7 @@ describe Spree.user_class do
       setup_email
 
       expect do
-        create(:user, confirmed_at: nil).confirm!
+        create(:user, confirmed_at: nil).confirm
       end.to enqueue_job ConfirmSignupJob
     end
   end