public void ConfigureServicesTest()
{
var hostBuilder = new HostBuilder();
StartupLoader.ConfigureServices(hostBuilder, new EmptyStartup());
Assert.Throws <InvalidOperationException>(() => StartupLoader.ConfigureServices(hostBuilder, new ConfigureServicesTestStartup0()));
StartupLoader.ConfigureServices(hostBuilder, new ConfigureServicesTestStartup1());
Assert.Throws <InvalidOperationException>(() => StartupLoader.ConfigureServices(hostBuilder, new ConfigureServicesTestStartup2()));
StartupLoader.ConfigureServices(hostBuilder, new ConfigureServicesTestStartup3());
StartupLoader.ConfigureServices(hostBuilder, new ConfigureServicesTestStartup4());
Assert.Throws <InvalidOperationException>(() => StartupLoader.ConfigureServices(hostBuilder, new ConfigureServicesTestStartup5()));
Assert.Throws <InvalidOperationException>(() => StartupLoader.ConfigureServices(hostBuilder, new ConfigureServicesTestStartup6()));
Assert.Throws <InvalidOperationException>(() => StartupLoader.ConfigureServices(hostBuilder, new ConfigureServicesTestStartup7()));
Assert.Throws <InvalidOperationException>(() => StartupLoader.ConfigureServices(hostBuilder, new ConfigureServicesTestStartup8()));
var services = hostBuilder.Build().Services;
Assert.NotNull(services.GetService <ConfigureServicesTestStartup1>());
Assert.NotNull(services.GetService <ConfigureServicesTestStartup3>());
Assert.NotNull(services.GetService <ConfigureServicesTestStartup4>());
}