How can I do unit testing for def checkout(request) method? Please give me detailed solution as I am new to unit testing. (python code)

from django.shortcuts import render from django.http import JsonResponse import json import datetime from .models import * from .utils import cookieCart, cartData, guestOrder def store(request): data = cartData(request) cartItems = data['cartItems'] order = data['order'] items = data['items'] products = Product.objects.all() context = {'products':products, 'cartItems':cartItems} return render(request, 'store/store.html', context) def cart(request): data = cartData(request) cartItems = data['cartItems'] order = data['order'] items = data['items'] context = {'items':items, 'order':order, 'cartItems':cartItems} return render(request, 'store/cart.html', context) def checkout(request): data = cartData(request) cartItems = data['cartItems'] order = data['order'] items = data['items'] context = {'items':items, 'order':order, 'cartItems':cartItems} return render(request, 'store/checkout.html', context)