Admin mailer parameterization (#25759)

spec/controllers/disputes/appeals_controller_spec.rb

@@ -14,13 +14,11 @@ RSpec.describe Disputes::AppealsController do
     let(:strike) { Fabricate(:account_warning, target_account: current_user.account) }
 
     before do
-      allow(AdminMailer).to receive(:new_appeal)
-        .and_return(instance_double(ActionMailer::MessageDelivery, deliver_later: nil))
       post :create, params: { strike_id: strike.id, appeal: { text: 'Foo' } }
     end
 
     it 'notifies staff about new appeal' do
-      expect(AdminMailer).to have_received(:new_appeal).with(admin.account, Appeal.last)
+      expect(ActionMailer::Base.deliveries.first.to).to eq([admin.email])
     end
 
     it 'redirects back to the strike page' do