diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
new file mode 100644
index 0000000..8a468f7
--- /dev/null
+++ b/.github/workflows/tests.yml
@@ -0,0 +1,31 @@
+name: Tests and formatting
+
+on:
+    push:
+    merge_group:
+
+jobs:
+    unit:
+        runs-on: ubuntu-20.04
+        steps:
+            - uses: actions/checkout@v4
+            - name: Use Node.js 20
+              uses: actions/setup-node@v4
+              with:
+                  node-version: 20.x
+            - name: Install dependencies
+              run: npm ci
+            - name: Run tests
+              run: npm run test
+    lint:
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v4
+            - name: Use Node.js 20
+              uses: actions/setup-node@v4
+              with:
+                  node-version: 20.x
+            - name: Install dependencies
+              run: npm ci
+            - name: Format check
+              run: npm run lint && echo 'No lint issues!' || (npm run lint-fix; git diff; echo 'Lint check failed, review diff above or run "npm run lint.fix"'; return 1)