diff --git a/core/lib/tests/untracked-vs-tracked.rs b/core/lib/tests/untracked-vs-tracked.rs
new file mode 100644
index 00000000..05b9ae5e
--- /dev/null
+++ b/core/lib/tests/untracked-vs-tracked.rs
@@ -0,0 +1,45 @@
+#[macro_use] extern crate rocket;
+
+use rocket::http::{Cookie, CookieJar};
+
+#[post("/")]
+fn add(jar: &CookieJar<'_>) {
+    jar.add(Cookie::new("name", "value"));
+}
+
+#[get("/")]
+fn get<'a>(jar: &'a CookieJar<'_>) -> Option<&'a str> {
+    jar.get("name").map(|c| c.value())
+}
+
+#[cfg(test)]
+mod many_cookie_jars_tests {
+    use super::*;
+    use rocket::local::blocking::Client;
+    use rocket::http::Status;
+
+    fn rocket() -> rocket::Rocket {
+        rocket::ignite().mount("/", routes![add, get])
+    }
+
+    #[test]
+    fn test_tracked() {
+        let client = Client::tracked(rocket()).unwrap();
+
+        assert_eq!(client.get("/").dispatch().status(), Status::NotFound);
+        assert_eq!(client.post("/").dispatch().status(), Status::Ok);
+
+        let response = client.get("/").dispatch();
+        assert_eq!(response.status(), Status::Ok);
+        assert_eq!(response.into_string().unwrap(), "value");
+    }
+
+    #[test]
+    fn test_untracked() {
+        let client = Client::untracked(rocket()).unwrap();
+
+        assert_eq!(client.get("/").dispatch().status(), Status::NotFound);
+        assert_eq!(client.post("/").dispatch().status(), Status::Ok);
+        assert_eq!(client.get("/").dispatch().status(), Status::NotFound);
+    }
+}