public void ConfigureHostTest()
{
var hostBuilder = new HostBuilder();
StartupLoader.ConfigureHost(hostBuilder, new EmptyStartup());
Assert.Throws <InvalidOperationException>(() => StartupLoader.ConfigureHost(hostBuilder, new ConfigureHostTestStartup0()));
StartupLoader.ConfigureHost(hostBuilder, new ConfigureHostTestStartup1());
Assert.Throws <InvalidOperationException>(() => StartupLoader.ConfigureHost(hostBuilder, new ConfigureHostTestStartup2()));
Assert.Throws <InvalidOperationException>(() => StartupLoader.ConfigureHost(hostBuilder, new ConfigureHostTestStartup3()));
Assert.Throws <InvalidOperationException>(() => StartupLoader.ConfigureHost(hostBuilder, new ConfigureHostTestStartup4()));
Assert.Throws <InvalidOperationException>(() => StartupLoader.ConfigureHost(hostBuilder, new ConfigureHostTestStartup7()));
var services = hostBuilder.Build().Services;
Assert.NotNull(services.GetService <ConfigureHostTestStartup1>());
}