diff --git a/.tangled/workflows/test.yml b/.tangled/workflows/test.yml
new file mode 100644
index 0000000..f7e0353
--- /dev/null
+++ b/.tangled/workflows/test.yml
@@ -0,0 +1,16 @@
+when:
+  - event: ["push", "pull_request"]
+    branch: main
+
+engine: nixery
+
+dependencies:
+  nixpkgs:
+    - cargo
+    - rustfmt
+
+steps:
+  - name: Format check
+    command: cargo fmt --all --check
+  - name: Tests
+    command: cargo test --workspace