diff --git a/.tangled/workflows/test.yml b/.tangled/workflows/test.yml
new file mode 100644
index 0000000..b4fef51
--- /dev/null
+++ b/.tangled/workflows/test.yml
@@ -0,0 +1,20 @@
+when:
+  - event: ["push"]
+    branch: ["main"]
+  - event: ["pull_request"]
+
+engine: "nixery"
+
+dependencies:
+  nixpkgs:
+    - gleam
+    - erlang_28
+    - rebar3
+
+steps:
+  - name: "Download deps"
+    command: "gleam deps download"
+  - name: "Test"
+    command: "gleam test"
+  - name: "Format check"
+    command: "gleam format --check src test"