Support axum 0.8.0

[sondrelg]

Hi @renancloudwalk. Thanks for creating this, it's been really nice to use 👌

Just wanted to let you know, the axum 0.8.0 release seems to require an update:

error[E0308]: mismatched types
   --> src/foo.rs:180:38
    |
180 |         let client = TestClient::new(app).await;
    |                      --------------- ^^^ expected `axum::routing::Router`, found `Router`
    |                      |
    |                      arguments to this function are incorrect

Do you think you'll have time to publish a compatibility fix?

[sawmurai]

In case anyone is interested in how a migration away from TestClient looks like:

get_app().await returns a Router (it also has state that is created async, hence the .await)

Works with axum 0.8.1.

     #[tokio::test]
     async fn returns_list_of_exercises() {
-        let client = TestClient::new(get_app().await).await;
+        let mut app = get_app().await;
+        let cookie = login_coach(&mut app).await;
 
-        let cookie = login_coach(&client).await;
-        let res = client
-            .get("/exercise")
+        let req = Request::builder()
+            .method("GET")
+            .uri("/exercise")
             .header("cookie", &cookie)
-            .send()
-            .await;
+            .body(Body::empty())
+            .unwrap();
+
+        let res = app.oneshot(req).await.unwrap();
         assert_eq!(res.status(), StatusCode::OK);
 
         let expected = r#"[{"id":"88dc900e-82c1-11ed-93b1-cfc2854f95b8","name":"Deadlift","groupId":null,"active":true,"userId":"d9ae8e47-112f-4d37-ba20-0cb1dbc776b6","metricType":"weight","usedCount":0,"offset":0}]"#;
-        assert_eq!(res.text().await, expected);
+        let body = axum::body::to_bytes(res.into_body(), 1000000)
+            .await
+            .unwrap();
+        assert_eq!(std::str::from_utf8(&body).unwrap(), expected);
     }