How to use tower_http::normalize_path with TestServer?

[agersant]

Summary

Hello! I was able to make use of the tower normalize path layer thanks to the tips I found in #2377.

However, I can't seem to find a way to create a Axum TestServer that also applies path normalization.

This code snippet:

let router = Router::new();
let app = NormalizePathLayer::trim_trailing_slash().layer(router);
let app = ServiceExt::<axum::extract::Request>::into_make_service(app);

let server = TestServer::new(app).unwrap();

fails to compile with the following error:

error[E0277]: the trait bound `axum::routing::IntoMakeService<tower_http::normalize_path::NormalizePath<axum::Router>>: axum_test::transport_layer::IntoTransportLayer` is not satisfied
 --> src\server\axum\test.rs:40:32
  |
40 |         let server = TestServer::new(app).unwrap();
  |                      --------------- ^^^ the trait `axum_test::transport_layer::IntoTransportLayer` is not implemented for `axum::routing::IntoMakeService<tower_http::normalize_path::NormalizePath<axum::Router>>`
  |                      |
  |                      required by a bound introduced by this call
  |
  = help: the trait `axum_test::transport_layer::IntoTransportLayer` is implemented for `axum::routing::IntoMakeService<axum::Router>

I understand what the error message is saying but I'm not sure what to do about it. Any help would be welcome!

axum version

0.7.5

[shusvr]

I believe you want to use Router::layer instead.

[jplatte]

No, layers applied via Router::layer (and Router::route_layer) run after routing, but for NormalizePath it's important that it runs before routing.

[simono]

@agersant I think this should be fixed in axum-test 15.7.0: JosephLenton/axum-test@b7f3ea3