chore: first working version with integration test

tests/health_check.rs

@@ -0,0 +1,34 @@
+use std::net::{SocketAddr, TcpListener};
+
+struct TestApp {
+    addr: SocketAddr,
+}
+
+#[tokio::test]
+async fn health_check_works() {
+    let TestApp { addr, .. } = spawn_app().await;
+
+    let client = reqwest::Client::new();
+    let response = client
+        .get(format!("http://{addr}/health_check"))
+        .send()
+        .await
+        .expect("Failed to execute request.");
+    assert!(response.status().is_success());
+    assert_eq!(Some(0), response.content_length());
+}
+
+// fn spawn_app() {
+//     let server = learn_axum::run().expect("Failed to bind address.");
+//     tokio::spawn(server);
+// }
+async fn spawn_app() -> TestApp {
+    let listener = TcpListener::bind("127.0.0.1:0").expect("Failed to bind to random port");
+    let addr = listener.local_addr().unwrap();
+
+    let server = learn_axum::run(listener).expect("Failed to bind to address");
+
+    tokio::spawn(server);
+
+    TestApp { addr }
+}