DD.WellWorkover.Cloud/AsbCloudWebApi.Tests/AspExtensions.cs

using Microsoft.Extensions.DependencyInjection;
using System.Linq;

namespace AsbCloudWebApi.Tests
{
    public static class AspExtensions
    {
        public static IServiceCollection ReplaceService<T>(this IServiceCollection services, T instance)
            where T : notnull
        {
            var typeofT = typeof(T);
            var originalDecriptor = services.Last(s => s.ServiceType == typeofT);
            var newDecriptor = new ServiceDescriptor(typeofT, instance);
            services.Remove(originalDecriptor);
            services.Add(newDecriptor);
            return services;
        }
    }
}