add a integration test for index page

tests/index.rs

@@ -0,0 +1,42 @@
+use std::net::TcpListener;
+
+use handlebars::Handlebars;
+use websurfx::run;
+
+
+// Starts a new instance of the HTTP server, bound to a random available port
+fn spawn_app() -> String {
+    // Binding to port 0 will trigger the OS to assign a port for us.
+    let listener = TcpListener::bind("127.0.0.1:0").expect("Failed to bind random port");
+    let port = listener.local_addr().unwrap().port();
+    let server = run(listener).expect("Failed to bind address");
+
+    tokio::spawn(server);
+    format!("http://127.0.0.1:{}/", port)
+}
+
+// Creates a new instance of Handlebars and registers the templates directory.
+// This is used to compare the rendered template with the response body.
+fn handlebars() -> Handlebars<'static> {
+    let mut handlebars = Handlebars::new();
+
+    handlebars
+        .register_templates_directory(".html", "./public/templates")
+        .unwrap();
+
+    handlebars
+}
+
+
+#[tokio::test]
+async fn test_index() {
+    let address = spawn_app();
+
+    let client = reqwest::Client::new();
+    let res = client.get(address).send().await.unwrap();
+    assert_eq!(res.status(), 200);
+    
+    let handlebars = handlebars();
+    let template = handlebars.render("index", &()).unwrap();
+    assert_eq!(res.text().await.unwrap(), template);
+}