health_check test

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()
+}