diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
new file mode 100644
index 0000000..ebdd0a5
--- /dev/null
+++ b/.github/workflows/check.yml
@@ -0,0 +1,16 @@
+name: Check
+on: [push, pull_request]
+jobs:
+  test:
+    strategy:
+      fail-fast: false
+    runs-on: ubuntu-latest
+    name: Test
+    steps:
+    - uses: actions/checkout@v3
+    - uses: actions/setup-java@v3
+      with:
+        distribution: 'zulu'
+        java-version: 21
+    - name: compile
+      run: find \( -name day\*.scala -o -name part\*.scala \) -print -execdir scala-cli compile \{\} \;