feat: use random port instead of 8000

src/lib.rs

@@ -1,4 +1,5 @@
 use actix_web::{dev::Server, web, App, HttpRequest, HttpResponse, HttpServer, Responder};
+use std::net::TcpListener;
 
 async fn greet(req: HttpRequest) -> impl Responder {
     let name = req.match_info().get("name").unwrap_or("World");
@@ -9,14 +10,14 @@ async fn health_check() -> impl Responder {
     HttpResponse::Ok()
 }
 
-pub fn run() -> Result<Server, std::io::Error> {
+pub fn run(listener: TcpListener) -> Result<Server, std::io::Error> {
     let server = HttpServer::new(|| {
         App::new()
             .route("/", web::get().to(greet))
             .route("/health_check", web::get().to(health_check))
             .route("/{name}", web::get().to(greet))
     })
-    .bind("127.0.0.1:8000")?
+    .listen(listener)?
     .run();
 
     Ok(server)

src/main.rs

@@ -1,6 +1,9 @@
+use std::net::TcpListener;
+
 use zero2prod::run;
 
 #[tokio::main]
 async fn main() -> Result<(), std::io::Error> {
-    run()?.await
+    let listener = TcpListener::bind("127.0.0.1:0").expect("Failed to bind random port");
+    run(listener)?.await
 }

tests/health_check.rs

@@ -1,16 +1,21 @@
-fn spawn_app() {
-    let server = zero2prod::run().expect("Failed to bind address");
+use std::net::TcpListener;
+
+fn spawn_app() -> String {
+    let listener = TcpListener::bind("127.0.0.1:0").expect("Failed to bind random port");
+    let port = listener.local_addr().unwrap().port();
+    let server = zero2prod::run(listener).expect("Failed to bind address");
     tokio::spawn(server);
+    format!("http://127.0.0.1:{port}")
 }
 
 #[tokio::test]
 async fn health_check_works() {
     // Arrange
-    spawn_app();
+    let address = spawn_app();
     // Act
     let client = reqwest::Client::new();
     let response = client
-        .get("http://localhost:8000/health_check")
+        .get(format!("{address}/health_check"))
         .send()
         .await
         .expect("Failed to execute request.");