feat: add new view and controller to display app configs together (#3563)

fixes: #3578

spec/controllers/super_admin/app_config_controller_spec.rb

@@ -0,0 +1,47 @@
+require 'rails_helper'
+
+RSpec.describe 'Super Admin Application Config API', type: :request do
+  let(:super_admin) { create(:super_admin) }
+
+  describe 'GET /super_admin/app_config' do
+    context 'when it is an unauthenticated super admin' do
+      it 'returns unauthorized' do
+        get '/super_admin/app_config'
+        expect(response).to have_http_status(:redirect)
+      end
+    end
+
+    context 'when it is an authenticated super admin' do
+      let!(:config) { create(:installation_config, { name: 'FB_APP_ID', value: 'TESTVALUE' }) }
+
+      it 'shows the app_config page' do
+        sign_in super_admin
+        get '/super_admin/app_config'
+        expect(response).to have_http_status(:success)
+        expect(response.body).to include(config.name)
+      end
+    end
+  end
+
+  describe 'POST /super_admin/app_config' do
+    context 'when it is an unauthenticated super admin' do
+      it 'returns unauthorized' do
+        post '/super_admin/app_config', params: { app_config: { TESTKEY: 'TESTVALUE' } }
+        expect(response).to have_http_status(:redirect)
+      end
+    end
+
+    context 'when it is an aunthenticated super admin' do
+      it 'shows the app_config page' do
+        sign_in super_admin
+        post '/super_admin/app_config', params: { app_config: { TESTKEY: 'TESTVALUE' } }
+
+        expect(response.status).to eq(302)
+        expect(response).should redirect_to(super_admin_app_config_path)
+
+        config = GlobalConfig.get('TESTKEY')
+        expect(config['TESTKEY']).to eq('TESTVALUE')
+      end
+    end
+  end
+end