diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 62ecfa6..6d133cf 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -25,6 +25,8 @@ jobs:
             - name: check for uncommited changes
               run: git diff --exit-code
             - run: npm test
+            - name: check test file formatting
+              run: npx tree-sitter test -u && git diff --exit-code
     prettier:
         runs-on: ubuntu-latest
         steps: