diff --git a/conn-id/src/lib.rs b/conn-id/src/lib.rs
index 5135260916..9059dd0ecc 100644
--- a/conn-id/src/lib.rs
+++ b/conn-id/src/lib.rs
@@ -75,10 +75,14 @@ impl ConnId {
     ```
     # use trillium_testing::prelude::*;
     # use trillium_conn_id::ConnId;
+    fastrand::seed(1000); // for testing, so our id is predictable
 
     let app = (ConnId::new(), "ok");
-
-    assert_eq!(get("/").on(&app).headers_mut()["x-request-id"].as_str().len(), 10);
+    assert_ok!(
+        get("/").on(&app),
+        "ok",
+        "x-request-id" => "U14baHj9ho"
+    );
 
     assert_headers!(
         get("/")
@@ -128,17 +132,18 @@ impl ConnId {
 
     ```
     # use trillium_testing::prelude::*;
-    # use trillium_conn_id::{ConnId, ConnIdExt};
+    # use trillium_conn_id::ConnId;
+    fastrand::seed(1000); // for testing, so our id is predictable
 
     let app = (
         ConnId::new().with_response_header(Some("x-custom-header")),
         "ok"
     );
 
-    let mut conn = get("/").on(&app);
-    let id = String::from(conn.id());
-
-    assert_headers!(&mut conn, "x-custom-header" => &*id);
+    assert_headers!(
+        get("/").on(&app),
+        "x-custom-header" => "U14baHj9ho"
+    );
     ```
     */
     pub fn with_response_header(mut self, response_header: Option<&'static str>) -> Self {
diff --git a/conn-id/tests/tests.rs b/conn-id/tests/tests.rs
index 76f604615e..169afc595c 100644
--- a/conn-id/tests/tests.rs
+++ b/conn-id/tests/tests.rs
@@ -4,12 +4,11 @@ use uuid::Uuid;
 
 #[test]
 fn test_defaults() {
+    fastrand::seed(1000);
     let app = (ConnId::new(), "ok");
-    let mut conn = get("/").on(&app);
-    let id = String::from(conn.id());
-    assert_eq!(id, conn.headers_mut()["x-request-id"].as_str());
-    assert_eq!(conn.id().len(), 10);
 
+    assert_ok!(get("/").on(&app), "ok", "x-request-id" => "U14baHj9ho");
+    assert_ok!(get("/").on(&app), "ok", "x-request-id" => "AawiNNFjGW");
     assert_ok!(
         get("/").with_request_header(("x-request-id", "inbound-id")).on(&app),
         "ok",
@@ -17,7 +16,8 @@ fn test_defaults() {
     );
 
     let conn = get("/").on(&app);
-    assert_eq!(log_formatter::conn_id(&conn, true), conn.id());
+    assert_eq!(conn.id(), "iHxXDjwzU5");
+    assert_eq!(log_formatter::conn_id(&conn, true), "iHxXDjwzU5");
 
     let conn = TestConn::build("get", "/", ());
     assert_eq!(log_formatter::conn_id(&conn, true), "-");
@@ -48,9 +48,10 @@ fn test_settings() {
 
 #[test]
 fn test_no_headers() {
+    fastrand::seed(1000);
+
     let app = (
         ConnId::new()
-            .with_id_generator(|| "test".into())
             .with_request_header(None)
             .with_response_header(None),
         "ok",
@@ -58,11 +59,11 @@ fn test_no_headers() {
 
     let mut conn = get("/").on(&app);
     assert!(conn.headers_mut().get("x-request-id").is_none());
-    assert_eq!(conn.id(), "test");
+    assert_eq!(conn.id(), "U14baHj9ho");
 
     let mut conn = get("/")
         .with_request_header(("x-request-id", "ignored"))
         .on(&app);
-    assert_eq!(conn.id(), "test");
+    assert_eq!(conn.id(), "AawiNNFjGW");
     assert!(conn.headers_mut().get("x-request-id").is_none());
 }