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I am writing functional tests for my API with XUnit.
I have configured my API using types. Something like this:

public void ConfigureServices(IServiceCollection services)

 services.ConfigureServices(services)
 .Configure<SqlServerData>(Configuration.GetSection(nameof(SqlServerData)))
 .Configure<SolrData>(Configuration.GetSection(nameof(SolrData)));

The problem comes when I try to configure my TestServer of the Microsoft.AspNetCore.TestHost class in the same way:

 Server = new TestServer(
 new WebHostBuilder()
 .ConfigureServices(services =>
 
 //SOME STUFF
 )
 .Configure(Configuration.GetSection(nameof(SqlServerData)))
 .UseStartup<TestStartup>()
 );

I get the following error

cannot convert from Microsoft.Extensions.Configuration.IConfigurationSection to System.Action<Microsoft.AspNetCore.Builder.IApplicationBuilder>

Configure method is defined in WebHostBuilderExtensions class in the Microsoft.AspNetCore.Hosting assembly and its signature is as follows:

public static IWebHostBuilder Configure(this IWebHostBuilder hostBuilder,
 Action<IApplicationBuilder> configureApp)

 ...

This means you must pass an action containing an IApplicationBuilder implementation instance. Something similar you can find in the Startup class in the API you're testing.

public void Configure(IApplicationBuilder app)

Other dependencies can also be injected in the Configure method, provided they're registered with the DI container you're using. Configure() is called by the runtime so you normally don't need to explicitly invoke it.

If what you need is to get an instance of your configuration in the Configure method, you can get it (or any other registered dependency) from the IServiceProvider instance that is exposed by the IApplicationBuilder object of the configuring action you pass to the method:

Server = new TestServer(new WebHostBuilder()
 .Configure(appBuilder =>
 
 //get the required service from the appBuilder's ApplicationServices property
 var config = appBuilder.ApplicationServices.GetService<IConfiguration>();

 var section = config.GetSection("YourSection");
 //Use your section here.
 )
 .UseStartup<TestStartup>()

However, please be careful because at that point it might be already too late to setup a service. Configure() is mostly used to setup the request pipeline. Even though you might have a legit use case to use the configuration in it, you should verify you can't do it in the ConfigureServices() method instead.

Hope this helps!

Very thanks for your response:

Other thing is I needed to add a reference to the Nuget:

Microsoft.Extensions.Options.ConfigurationExtensions

Now I can do something like:

Server = new TestServer(
 new WebHostBuilder()
 .ConfigureServices(services =>
 

 services.Configure<SqlServerData>(Configuration.GetSection("SqlServerData"));
 services.Configure<SolrData>(Configuration.GetSection("SolrData"));
 )
 .UseStartup<TestStartup>()
 );

Thanks