Add routes and controller to scan Qr code

Added TicketScanning controller and routes to scan qr code on PhysicalTickets. Added test for the same

spec/controllers/admin/ticket_scannings_controller_spec.rb

@@ -0,0 +1,60 @@
+require 'spec_helper'
+
+describe Admin::TicketScanningsController do
+  let(:admin) { create(:admin) }
+  let(:conference) { create(:conference) }
+  let(:user) { create(:user) }
+  let(:paid_ticket_purchase) { create(:ticket_purchase, conference: conference, user: user) }
+  let(:physical_ticket) { create(:physical_ticket, ticket_purchase: paid_ticket_purchase) }
+
+  context 'logged in as user with no role' do
+    before :each do
+      sign_in user
+    end
+    describe 'POST #create' do
+      it 'does not create new ticket scanning' do
+        expected = expect do
+          post :create, physical_ticket_id: physical_ticket.token
+        end
+        expected.to_not change(TicketScanning, :count)
+      end
+
+      it 'redirects to root' do
+        post :create, physical_ticket_id: physical_ticket.token
+        expect(flash[:alert]).to eq('You are not authorized to access this page.')
+        expect(response).to redirect_to(root_path)
+      end
+    end
+  end
+
+  context 'logged in as admin' do
+    before :each do
+      sign_in admin
+    end
+    describe 'POST #create' do
+      context 'with valid physical_ticket' do
+        it 'creates new ticket scanning' do
+          expected = expect do
+            post :create, physical_ticket_id: physical_ticket.token
+          end
+          expected.to change { TicketScanning.count }.by(1)
+        end
+
+        it 'redirects to index' do
+          post :create, physical_ticket_id: physical_ticket.token
+          expect(flash[:notice]).to eq("Ticket with token #{physical_ticket.token} successfully scanned.")
+          expect(response).to redirect_to(conferences_path)
+        end
+      end
+
+      context 'with Invalid physical_ticket' do
+        it 'raises exception' do
+          expected = expect do
+            post :create, physical_ticket_id: 'XXXX'
+          end
+          expected.to raise_exception(ActiveRecord::RecordNotFound)
+        end
+      end
+    end
+  end
+end