diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..7969284
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,30 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    name: Test and Lint
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+
+      - name: Setup Bun
+        uses: oven-sh/setup-bun@b7a1c7ccf290d58743029c4f6903da283811b979 # v2.1.0
+        with:
+          bun-version: latest
+
+      - name: Install dependencies
+        run: bun install --frozen-lockfile
+
+      - name: Test code
+        run: bun run test
+
+      - name: Lint code
+        run: bun run lint
diff --git a/apps/wordle/src/lib/get-tile-colors.ts b/apps/wordle/src/lib/get-tile-colors.ts
index a4b04f1..6ee09a7 100644
--- a/apps/wordle/src/lib/get-tile-colors.ts
+++ b/apps/wordle/src/lib/get-tile-colors.ts
@@ -9,7 +9,10 @@ function getTileColors(guessWord: string, secretWord: string): TileColor[] {
     "absent",
   );
   const letterCounts = [...secret].reduce<Record<string, number>>(
-    (res, char) => ((res[char] = (res[char] || 0) + 1), res),
+    (res, char) => {
+      res[char] = (res[char] || 0) + 1;
+      return res;
+    },
     {},
   );
 
diff --git a/package.json b/package.json
index cd9efa6..19acb35 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,9 @@
     }
   },
   "scripts": {
-    "format": "bunx biome format --write"
+    "test": "bun test",
+    "lint": "biome lint",
+    "format": "biome format --write"
   },
   "devDependencies": {
     "@biomejs/biome": "2.3.10",