Myujth

I have a ASP.NET Core project with some simple Razor pages and a Web API controller.

I'm using Clean Architecture as a starting point. I've renamed the project names, removed the MVC stuff and added some of my own code. Everything runs and works.

However, the integration tests throw the following error when calling factory.CreateClient():

Test Name: ToDo.Tests.Integration.Web.HomeControllerIndexShould.ReturnViewWithCorrectMessage
Test FullName: ToDo.Tests.Integration.Web.HomeControllerIndexShould.ReturnViewWithCorrectMessage
Test Source: C:SourceUtopiatestsToDo.TestsIntegrationWebHomeControllerIndexShould.cs : line 18
Test Outcome: Failed
Test Duration: 0:00:00,001

Result StackTrace: 
at Microsoft.AspNetCore.Hosting.Internal.HostingEnvironmentExtensions.Initialize(IHostingEnvironment hostingEnvironment, String contentRootPath, WebHostOptions options)
 at Microsoft.AspNetCore.Hosting.WebHostBuilder.BuildCommonServices(AggregateException& hostingStartupErrors)
 at Microsoft.AspNetCore.Hosting.WebHostBuilder.Build()
 at Microsoft.AspNetCore.TestHost.TestServer..ctor(IWebHostBuilder builder, IFeatureCollection featureCollection)
 at Microsoft.AspNetCore.Mvc.Testing.WebApplicationFactory`1.CreateServer(IWebHostBuilder builder)
 at Microsoft.AspNetCore.Mvc.Testing.WebApplicationFactory`1.EnsureServer()
 at Microsoft.AspNetCore.Mvc.Testing.WebApplicationFactory`1.CreateDefaultClient(DelegatingHandler handlers)
 at Microsoft.AspNetCore.Mvc.Testing.WebApplicationFactory`1.CreateClient(WebApplicationFactoryClientOptions options)
 at ToDo.Tests.Integration.Web.HomeControllerIndexShould..ctor(CustomWebApplicationFactory`1 factory) in C:SourceUtopiatestsToDo.TestsIntegrationWebHomeControllerIndexShould.cs:line 14
Result Message: 
System.ArgumentException : The content root 'C:SourceUtopiaToDo.Web' does not exist.
Parameter name: contentRootPath

I've tried configuring the custom WebApplicationFactory by using builder.UseContentRoot and builder.UseSolutionRelativeContentRoot but it keeps throwing the same error no matter what values I use for the ContentRoot methods.

I don't know why my tests are failing while the one in the Clean Architecture sample are working. I also don't know how to fix it.

Any pointers are highly appreciated!

I'm not entirely sure what you're talking about, but you shouldn't be configuring stuff like this in a test project, in the first place. Instead, you should create a class like TestStartup and inherit from the SUT's Startup class. In the SUT's Startup class, you should factor out things like your DB setup and such into virtual private methods, which you can then override on TestStartup. For example, you could create a method like:

private virtual void ConfigureDatabase(IServiceCollection services)

 services.AddDbContext<MyContext>(o =>
 o.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));

Then in your TestStartup, you'd add something like:

private override void ConfigureDatabase(IServiceCollection services)

 var databaseName = Guid.NewGuid().ToString();
 services.AddDbContext<MyContext>(o =>
 o.UseInMemoryDatabase(databaseName));

Then, when setting up your factory for testing, you tell it to use your TestStartup:

var client = factory.WithWebHostBuilder(b => b.UseStartup<TestStartup>()).CreateClient();

Or, you can create you own custom WebApplicationFactory and set it there:

public class CustomWebApplicationFactory<TStartup> : WebApplicationFactory<RazorPagesProject.Startup>

 protected override void ConfigureWebHost(IWebHostBuilder builder)
 
 builder.UseStartup<TestStartup>();
 

Just bear in mind that the TStartup generic type param is for getting the entry point assembly, so you'd still put Startup there.

The main point of this is that you don't need to repeat all your startup configuration, and then remember to keep in sync. Your test client will use the exact same startup config your actual apps uses, except for a few keep replacements like using an in-memory database.

This method worked for me

 var client = _factory
 .WithWebHostBuilder(builder => builder.UseSolutionRelativeContentRoot("relative/path/of/project/under/test"))
 .CreateClient();

See How the test infrastructure infers the app content root path for more information.