MSpec, EF Core 2.0 In-Memory Provider Sample

WhenUsingAppRepository.cs

using TheCompany.Something.Api.Repositories;
using TheCompany.Something.Data;
using TheCompany.Something.Data.Models;
using Machine.Fakes;
using Machine.Specifications;
using Microsoft.EntityFrameworkCore;
using System;
using System.Threading;
using System.Threading.Tasks;

namespace TheCompany.Something.Test
{
    [Subject("Data Access")]
    public class WhenUsingAppRepository : WithSubject<ApplicationRepository>
    {
        static Application result;

        Establish context = () =>
        {
            Configure(x => x.For<SomethingDataContext>().Use(() =>
            {
                var options = new DbContextOptionsBuilder();
                options.UseInMemoryDatabase(nameof(SomethingDataContext));

                var context = new SomethingDataContext(options.Options);
                context.ApplicationAccessKeys.Add(new ApplicationAccessKey()
                {
                    Application = new Application() { UniqueId = Guid.Empty },
                    MasterKey = "secret_key",
                    Enabled = true
                });
                context.SaveChanges();
                return context;
            }));
        };

        Because of = () => result = Subject.GetApplicationBySecretKey(Guid.Empty, "secret_key", CancellationToken.None).Result;

        It should_not_be_null = () => result.ShouldNotBeNull();
    }
}