为什么 TestServer (AspNetCore) 在静态文件上给出 404 错误？

Question

I have a sample server

var host = new WebHostBuilder()
                .UseKestrel()
                .UseContentRoot(Directory.GetCurrentDirectory())
                .UseIISIntegration()
                .UseStartup<Startup>()
                .Build();

            host.Run();

with configuration in Startup class:

public void Configure(IApplicationBuilder app)
{
        app.Run(async (context) =>
        {
            await context.Response.WriteAsync("Hello World!");
        });
}

and I am using xunit test (learning):

        public TestFixture()
        {
            var builder = new WebHostBuilder().UseStartup<TStartup>();
            _server = new TestServer(builder);

            Client = _server.CreateClient();
            Client.BaseAddress = new Uri(address);
        }

and later

        var response = await Client.GetAsync("http://localhost:51021/");
        Assert.Equal(HttpStatusCode.OK, response.StatusCode);
        var responseString = await response.Content.ReadAsStringAsync();
        var content = await response.Content.ReadAsStringAsync();
        Assert.Contains("Hello World!", content);

Everything is OK (200). Now I am changing Startup.cs

    public void Configure(IApplicationBuilder app)
    {
        app.UseDefaultFiles();
        app.UseStaticFiles();
        //app.Run(async (context) =>
        //{
        //    await context.Response.WriteAsync("Hello World!");
        //});
    }

If I start the app with browser, everything is OK (index.html shown). But if I call it with the TestServer I receive (404 Not found). Where is my error?

Answer 1

XUnit starts the site from a different directory. We've had to work around it like this: https://github.com/aspnet/StaticFiles/blob/d692066b2bd711653150ad2cccc2268583355532/test/Microsoft.AspNetCore.StaticFiles.Tests/StaticFilesTestServer.cs#L20

Answer 2

Another approach is to copy those files into your unit test project

Then

As far as you maintain the same structure folder of the project that you are testing, it will find out the files and pass it to the dependency injection process.