feat(delta): test harness for web server

crates/delta/src/util/mod.rs

@@ -1 +1,2 @@
 pub mod ratelimiter;
+pub mod test;

crates/delta/src/util/test.rs

@@ -0,0 +1,26 @@
+use rocket::local::asynchronous::Client;
+use std::ops::Deref;
+
+pub struct TestHarness {
+    client: Client,
+}
+
+impl TestHarness {
+    pub async fn new() -> TestHarness {
+        dotenv::dotenv().ok();
+
+        let client = Client::tracked(crate::web().await)
+            .await
+            .expect("valid rocket instance");
+
+        TestHarness { client }
+    }
+}
+
+impl Deref for TestHarness {
+    type Target = Client;
+
+    fn deref(&self) -> &Self::Target {
+        &self.client
+    }
+}