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WebApplicationFactory<Program> can only be used with workaround in F# aspnet integration tests #18302
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closing as i need to verify something else, sorry
ok checked and this also doesnt work it seems or at least can be confusing for new users...
<ItemGroup> <InternalsVisibleTo Include="MyTestProject" /> </ItemGroup>in F#, so probably we can reopen this one?
Yeah, it's because
WebApplicationFactoryrequires thatProgramnot be a static class, but the implicit or explicitProgrammodule in F# is compiled as a static class.Another way you can work around it—which I think is conceptually simpler anyway—is to simply expose a public higher-order
appfunction that accepts a builder configuration function and returns the built web app.In
Program.fs, just call theappfunction and pass inignore(or(fun _ -> ())), then call.Run ()on the web app just like normal:Program.fs
module Program open System open Microsoft.AspNetCore.Builder open Microsoft.Extensions.Hosting let app configureBuilder = let builder = WebApplication.CreateBuilder (Environment.GetCommandLineArgs ()) // Your normal setup logic goes here, before the call to configureBuilder. ignore <| builder.Logging.AddConsole () ignore <| builder.Services.AddSingleton<SomeService1> () ignore <| builder.Services.AddSingleton<SomeService2> () // …etc. ignore <| configureBuilder builder let app = builder.Build () ignore <| app.MapGet ("/", Func<_> (fun () -> "Hello, world")) app (app ignore).Run ()
In your tests, you can just pass in a function that configures the builder however you want, overriding services (or not), etc., as needed:
Tests.fs
let myTest route x y z = task { use app = Program.app (fun builder -> ignore <| builder.WebHost.UseTestServer () // ignore <| builder.Services. … whatever else you want to override before `builder.Build ()` is called. ) do! app.StartAsync () use client = app.GetTestClient () // The rest of your test logic. use! resp = client.GetAsync route // Your assertions, etc… }
the only way to make use of integration tests for aspnetcore from F# code , is either use the old
Startupclass setup (not valid for minimal api), or use this setup which makes use of a "trick" of declaring both a type and a module right after forProgramas else the Program static class is not visible for unit/integration tests in the minimal api form?then it can be used by
WebApplicationFactory<Program>in F# unit tests