Extract handler::root mod and add test

rust/crates/web/src/handler.rs

@@ -1,3 +1,5 @@
+mod root;
+
 use async_graphql::http::GraphiQLSource;
 use async_graphql_axum::{GraphQLRequest, GraphQLResponse};
 use axum::{
@@ -38,7 +40,7 @@ pub struct Data(pub Box<dyn Store + Send + Sync + 'static>);
 
 pub fn route<T: Clone + HasSchema + HasStore + Send + Sync + 'static>(store: T) -> Router {
     Router::new()
+        .merge(root::route::<T>())
         .route("/graphql", routing::get(graphiql).post(handler::<T>))
-        .route("/", routing::get(|| async { "Hello, World!" }))
         .with_state(store)
 }

rust/crates/web/src/handler/root.rs

@@ -0,0 +1,31 @@
+use axum::{routing, Router};
+
+async fn handler<T>() -> &'static str {
+    "Hello, World!"
+}
+
+pub fn route<T: Clone + Send + Sync + 'static>() -> Router<T> {
+    Router::new().route("/", routing::get(handler::<T>))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::test_utils::{send_request, ResponseExt};
+    use axum::http::{Request, StatusCode};
+
+    #[tokio::test]
+    async fn test() -> anyhow::Result<()> {
+        let app = route();
+        let request = Request::builder()
+            .method("GET")
+            .uri("/")
+            .header("Content-Type", "application/json")
+            .body(hyper::Body::empty())?;
+        let response = send_request(app, request).await?;
+
+        assert_eq!(response.status(), StatusCode::OK);
+        assert_eq!(response.into_body_as_string().await?, "Hello, World!");
+        Ok(())
+    }
+}