InjecaoEF_Startup.cs

 public void ConfigureServices(IServiceCollection services)
        {
            services.AddControllers();

            services.AddDbContext<AplicacaoContext>(options =>
                options.UseInMemoryDatabase("DBMemory"));

            services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
            services.AddScoped<IEnvioEmail, EnvioEmail>();
        }