Fix RSpec/StubbedMock cop (#25552)

Co-authored-by: Claire <claire.github-309c@sitedethib.com>

spec/controllers/api/base_controller_spec.rb

@@ -88,10 +88,11 @@ describe Api::BaseController do
       Mastodon::NotPermittedError => 403,
     }.each do |error, code|
       it "Handles error class of #{error}" do
-        expect(FakeService).to receive(:new).and_raise(error)
+        allow(FakeService).to receive(:new).and_raise(error)
 
         get 'error'
         expect(response).to have_http_status(code)
+        expect(FakeService).to have_received(:new)
       end
     end
   end

spec/controllers/api/v1/media_controller_spec.rb

@@ -16,7 +16,7 @@ RSpec.describe Api::V1::MediaController do
     describe 'with paperclip errors' do
       context 'when imagemagick cant identify the file type' do
         it 'returns http 422' do
-          expect_any_instance_of(Account).to receive_message_chain(:media_attachments, :create!).and_raise(Paperclip::Errors::NotIdentifiedByImageMagickError)
+          allow_any_instance_of(Account).to receive_message_chain(:media_attachments, :create!).and_raise(Paperclip::Errors::NotIdentifiedByImageMagickError)
           post :create, params: { file: fixture_file_upload('attachment.jpg', 'image/jpeg') }
 
           expect(response).to have_http_status(422)
@@ -25,7 +25,7 @@ RSpec.describe Api::V1::MediaController do
 
       context 'when there is a generic error' do
         it 'returns http 422' do
-          expect_any_instance_of(Account).to receive_message_chain(:media_attachments, :create!).and_raise(Paperclip::Error)
+          allow_any_instance_of(Account).to receive_message_chain(:media_attachments, :create!).and_raise(Paperclip::Error)
           post :create, params: { file: fixture_file_upload('attachment.jpg', 'image/jpeg') }
 
           expect(response).to have_http_status(500)

spec/controllers/auth/registrations_controller_spec.rb

@@ -15,20 +15,22 @@ RSpec.describe Auth::RegistrationsController do
     it 'redirects if it is in single user mode while it is open for registration' do
       Fabricate(:account)
       Setting.registrations_mode = 'open'
-      expect(Rails.configuration.x).to receive(:single_user_mode).and_return(true)
+      allow(Rails.configuration.x).to receive(:single_user_mode).and_return(true)
 
       get path
 
       expect(response).to redirect_to '/'
+      expect(Rails.configuration.x).to have_received(:single_user_mode)
     end
 
     it 'redirects if it is not open for registration while it is not in single user mode' do
       Setting.registrations_mode = 'none'
-      expect(Rails.configuration.x).to receive(:single_user_mode).and_return(false)
+      allow(Rails.configuration.x).to receive(:single_user_mode).and_return(false)
 
       get path
 
       expect(response).to redirect_to '/'
+      expect(Rails.configuration.x).to have_received(:single_user_mode)
     end
   end