diff --git a/s/test b/s/test
index 30e0f206..e9596eac 100755
--- a/s/test
+++ b/s/test
@@ -1,3 +1,7 @@
 #!/bin/sh
 
-cargo test
+if ! command -v cargo-insta >/dev/null 2>&1; then
+  cargo install cargo-insta --locked
+fi
+
+cargo insta test --check --unreferenced reject