Add more abstract integration test

tests/http_integration.rs

@@ -0,0 +1,44 @@
+// This integration test checks whether the HTTP server works by actually running rustical in a new
+// thread.
+use common::rustical_process;
+use http::StatusCode;
+use std::time::Duration;
+
+mod common;
+
+pub async fn test_runner<O, F>(inner: F)
+where
+    O: IntoFuture<Output = ()>,
+    // <O as IntoFuture>::IntoFuture: UnwindSafe,
+    F: FnOnce(String) -> O,
+{
+    // Start RustiCal process
+    let (token, port, main_process, start_notify) = rustical_process();
+    let origin = format!("http://localhost:{port}");
+
+    // Wait for RustiCal server to listen
+    tokio::time::timeout(Duration::new(2, 0), start_notify.notified())
+        .await
+        .unwrap();
+
+    // We use catch_unwind to make sure we'll always correctly stop RustiCal
+    // Otherwise, our process would just run indefinitely
+    inner(origin).into_future().await;
+
+    // Signal RustiCal to stop
+    token.cancel();
+    main_process.join().unwrap();
+}
+
+#[tokio::test]
+async fn test_ping() {
+    test_runner(async |origin| {
+        let resp = reqwest::get(origin.clone() + "/ping").await.unwrap();
+        assert_eq!(resp.status(), StatusCode::OK);
+
+        // Ensure that path normalisation works as intended
+        let resp = reqwest::get(origin + "/ping/").await.unwrap();
+        assert_eq!(resp.status(), StatusCode::OK);
+    })
+    .await
+}