public void TestingServiceCollectionExtensions_ShouldPass() { var databaseConfiguration = new DatabaseConfiguration { ConnectionString = "Hello World!!!" }; var serviceCollection = new Microsoft.Extensions.DependencyInjection.ServiceCollection(); var serviceProvider = serviceCollection.BuildServiceProvider(); var tenantLogic = serviceProvider.GetService <TenantLogic>(); Assert.Null(tenantLogic); serviceCollection.AddDatabaseClasses(databaseConfiguration); serviceProvider = serviceCollection.BuildServiceProvider(); tenantLogic = serviceProvider.GetService <TenantLogic>(); Assert.NotNull(tenantLogic); }