controller_name.rb

def accept
  authorize!(:admin_affiliates, org)
  
  service = AffiliateApplicationService.new(@campaign)

  if service.accept_affiliate_application(affiliate_application_id: params[:id])
    flash[:success] = "Accepted #{service.application.user.name}"
  else
    flash[:error] = "Application was not accepted. Please try again"
  end

  respond_to do |format|
    format.turbo_stream do
      render turbo_stream: turbo_stream.replace(dom_id(service.application), partial: 'application_accept_reject_column', locals: { affiliate_application: service.application });
    end

    format.html do
      redirect_to admin_campaign_affiliate_applications_path(@campaign)
    end
  end
end


# Rspec Test for accept

# I use factories (Factory Bot gem) 
# for prepare: org, campaign, affiliate_application, user, trait for admin
# Devise for authentication


require 'rails_helper'

RSpec.describe YourControllerName, type: :controller do
  describe 'POST #accept' do
    let(:org) { create(:org) }
    let(:campaign) { create(:campaign) }
    let(:affiliate_application) { create(:affiliate_application, campaign: campaign) }
    let(:user) { create(:user, :admin) }

    before do
      sign_in user
    end

    context 'when application is accepted successfully' do
      it 'sets a success flash message' do
        post :accept, params: { id: affiliate_application.id }

        expect(flash[:success]).to eq "Accepted #{affiliate_application.user.name}"
      end
    end

    context 'when application is not accepted' do
      it 'sets an error flash message' do
        post :accept, params: { id: affiliate_application.id }

        expect(flash[:error]).to eq 'Application was not accepted. Please try again'
      end
    end

    context 'with turbo_stream format' do
      it 'renders the application_accept_reject_column partial' do
        post :accept, params: { id: affiliate_application.id }, format: :turbo_stream

        expect(response).to render_template(partial: '_application_accept_reject_column')
      end
    end

    context 'with html format' do
      it 'redirects to the affiliate applications index page' do
        post :accept, params: { id: affiliate_application.id }, format: :html
        
        expect(response).to redirect_to admin_campaign_affiliate_applications_path(campaign)
      end
    end
  end
end