Cut down demo of a base class for our xUnit tests

TestBase.cs

using UCommerce.EntitiesV2;
using Xunit.Abstractions;

namespace Website.Tests
{
    public class TestBase : XunitApprovalBase
    {
        protected TestBase(ITestOutputHelper output)
            : base(output)
        {
            RetailCustomer = GenerateMockCustomer();
        }

        protected Customer RetailCustomer { get; }
    }
}