health_check test

Cargo.toml

@@ -3,4 +3,16 @@ name = "zero2prod"
 version = "0.1.0"
 edition = "2024"
 
+[lib]
+path = "src/lib.rs"
+
+[[bin]]
+path = "src/main.rs"
+name = "zero2prod"
+
 [dependencies]
+axum = "0.8.4"
+reqwest = "0.12.23"
+tokio = { version = "1", features = ["full"] }
+tower = "0.5.2"
+

src/lib.rs

@@ -0,0 +1,17 @@
+use axum::{Router, http::StatusCode, response::IntoResponse, routing::get};
+
+pub async fn run() {
+    let listener = tokio::net::TcpListener::bind("127.0.0.1:3000")
+        .await
+        .unwrap();
+    println!("listening on {}", listener.local_addr().unwrap());
+    axum::serve(listener, app()).await.unwrap();
+}
+
+async fn health_check() -> impl IntoResponse {
+    StatusCode::OK
+}
+
+pub fn app() -> Router {
+    Router::new().route("/health_check", get(health_check))
+}

src/main.rs

@@ -1,3 +1,6 @@
-fn main() {
-    println!("Hello, world!");
+use zero2prod::run;
+
+#[tokio::main]
+async fn main() {
+    run().await;
 }

tests/health_check.rs

@@ -0,0 +1,27 @@
+use tokio::net::TcpListener;
+use zero2prod::app;
+
+#[tokio::test]
+async fn health_check_works() {
+    let addr = spawn_app().await;
+    let client = reqwest::Client::new();
+    let response = client
+        .get(&format!("http://{}/health_check", addr))
+        .send()
+        .await
+        .expect("Failed to execute request");
+
+    assert!(response.status().is_success());
+    assert_eq!(Some(0), response.content_length());
+}
+
+async fn spawn_app() -> String {
+    let listener = TcpListener::bind("127.0.0.1:0").await.unwrap();
+    let addr = listener.local_addr().unwrap();
+
+    tokio::spawn(async move {
+        axum::serve(listener, app()).await.unwrap();
+    });
+
+    addr.to_string()
+}