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Showing content from https://github.com/dotnet/aspnetcore/issues/45372 below:

WebApplicationFactory Client returns NotFound for all requests with Overriding Configure method · Issue #45372 · dotnet/aspnetcore · GitHub

• I have searched the existing issues

Hi,
I create bellow custom factory for E2E test:

public class CustomWebApplicationFactory : WebApplicationFactory<Program>
{
    protected override void ConfigureWebHost(IWebHostBuilder builder)
    {
        builder.ConfigureServices(services =>
        {
            // extend service collection
        });

        builder.ConfigureTestServices(services =>
        {
            // extend service collection
        });

         builder.Configure(app =>
         {
             // extend application builder
         });
    }
}

Also, this is my Program file:

using System.Reflection;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.

builder.Services.AddControllers() .AddApplicationPart(Assembly.GetExecutingAssembly());;
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

var app = builder.Build();

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}

app.UseHttpsRedirection();

app.UseAuthorization();

app.MapControllers();

app.MapGet("WeatherForecast", _ =>
{
    var summaries = new[]
    {
        "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
    };
    return Task.FromResult(Enumerable.Range(1, 5).Select(index => new WeatherForecast
    {
        Date = DateOnly.FromDateTime(DateTime.Now.AddDays(index)),
        TemperatureC = Random.Shared.Next(-20, 55),
        Summary = summaries[Random.Shared.Next(summaries.Length)]
    }));
});

app.Run();

public partial class Program{}

When I want to call WeatherForecast GET endpoint, with WebApplicationFactory Client I get NotFound response from client in my test instead of OK

public class UnitTest1: CustomWebApplicationFactory
{
    [Fact]
    public async Task Test1()
    {
        var response = await CreateClient().GetAsync("/WeatherForecast");
        response.Should().Be200Ok();
    }
}

If I remove below section from My CustomFactory my http client returns OK status code

  builder.Configure(app =>
 {
     // extend application builder
 });

I Expect to get a 200 ok status code for this http call on http client

Run this test

Xunit.Sdk.XunitException
Expected response to be HttpStatusCode.OK {value: 200}, but found HttpStatusCode.NotFound {value: 404}.

The HTTP response was:

HTTP/1.1 404 NotFound
Content-Length: 0


The originated HTTP request was:

GET http://localhost/WeatherForecast HTTP 1.1
Content-Length: 0

   at FluentAssertions.Execution.XUnit2TestFramework.Throw(String message)
   at FluentAssertions.Execution.TestFrameworkProvider.Throw(String message)
   at FluentAssertions.Execution.DefaultAssertionStrategy.HandleFailure(String message)
   at FluentAssertions.Execution.AssertionScope.FailWith(Func`1 failReasonFunc)
   at FluentAssertions.Execution.AssertionScope.FailWith(Func`1 failReasonFunc)
   at FluentAssertions.Execution.AssertionScope.FailWith(String message, Object[] args)
   at FluentAssertions.Web.HttpResponseMessageAssertions.Be200Ok(String because, Object[] becauseArgs)
   at FluentAssertions.HttpStatusCodeAssertionsExtensions.Be200Ok(HttpResponseMessageAssertions`1 parent, String because, Object[] becauseArgs)
   at E2E.UnitTest1.Test1() in C:\Users\MehdiHadeli\Desktop\E2E\Test\UnitTest1.cs:line 11
   at Xunit.Sdk.TestInvoker`1.<>c__DisplayClass48_0.<<InvokeTestMethodAsync>b__1>d.MoveNext() in /_/src/xunit.execution/Sdk/Frameworks/Runners/TestInvoker.cs:line 264
--- End of stack trace from previous location ---
   at Xunit.Sdk.ExecutionTimer.AggregateAsync(Func`1 asyncAction) in /_/src/xunit.execution/Sdk/Frameworks/ExecutionTimer.cs:line 48
   at Xunit.Sdk.ExceptionAggregator.RunAsync(Func`1 code) in /_/src/xunit.core/Sdk/ExceptionAggregator.cs:line 90

7.0.0

No response

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