fix tests spinning up server

tests/common/mod.rs

@@ -1,16 +0,0 @@
-use std::net::TcpListener;
-
-pub fn spawn_app() -> String {
-    let listener = TcpListener::bind("127.0.0.1:0").expect("Failed to bind random port");
-    let _ = listener.set_nonblocking(true);
-    // We retrieve the port assigned to us by the OS
-    let port = listener.local_addr().unwrap().port();
-    let server = nuchat::run(
-        tokio::net::TcpListener::from_std(listener)
-            .expect("Failed to convert from_std to tokio listener"),
-    )
-    .expect("Failed to bind address");
-    tokio::spawn(server.into_future());
-    // We return the application address to the caller!
-    format!("http://127.0.0.1:{port}")
-}