isn/test/nuget.host.tests/UnitTestWebHost.cs

using System;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore;
using nuget_host;
using Xunit;
using nuget_host.Data;
using Microsoft.Extensions.Options;
using nuget_host.Entities;
using System.Threading.Tasks;
using Microsoft.EntityFrameworkCore;
using System.Diagnostics;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;

namespace nuget.host.tests
{
    public class UnitTestWebHost
    {
        const string testingUrl = "http://localhost:5000";


        [Fact]
        public void TestHaveTestDbContext()
        {
            string envVar = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT");
            Assert.Equal("Development", envVar);
            IWebHost webhost = BuildWebHost(new string[] { "--urls", testingUrl });

            using (var serviceScope = webhost.Services.CreateScope())
            {
                var services = serviceScope.ServiceProvider;

                try
                {
                    var myDependency = services.GetRequiredService<ApplicationDbContext>();
                    myDependency.Database.Migrate();
                }
                catch (Exception ex)
                {
                    var logger = services.GetRequiredService<ILogger<Program>>();
                    logger.LogError(ex, "An error occurred.");
                }
            }

        }



        public static IWebHost BuildWebHost(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseStartup<Startup>()
                .Build();

    }
}