feat: add tests structure

Author: y-nk

.github/workflows/test.yml

@@ -0,0 +1,23 @@
+name: Test
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - uses: actions/setup-node@v4
+      with:
+        node-version-file: .node-version
+
+    - uses: pnpm/action-setup@v4
+
+    - run: pnpm install
+
+    - run: pnpm test

.node-version

@@ -0,0 +1 @@
+20

package.json

@@ -1,12 +1,14 @@
 {
   "name": "wr",
   "version": "1.0.0",
+  "packageManager": "pnpm@10.13.1",
   "scripts": {
     "build:backends": "esbuild src/actions/backends.ts --bundle --platform=node --target=node20 --minify --outfile=backends/index.js",
     "build:diff": "esbuild src/actions/diff.ts --bundle --platform=node --target=node20 --minify --outfile=diff/index.js",
     "build:list": "esbuild src/actions/list.ts --bundle --platform=node --target=node20 --minify --outfile=list/index.js",
     "build:resolve": "esbuild src/actions/resolve.ts --bundle --platform=node --target=node20 --minify --outfile=resolve/index.js",
-    "build": "pnpm build:backends; pnpm build:diff; pnpm build:list; pnpm build:resolve"
+    "build": "pnpm build:backends; pnpm build:diff; pnpm build:list; pnpm build:resolve",
+    "test": "vitest run"
   },
   "dependencies": {
     "@actions/core": "^1.11.1",
@@ -21,6 +23,7 @@
     "esbuild": "^0.25.0",
     "knip": "^5.45.0",
     "prettier": "^3.5.3",
-    "typescript": "^5.8.2"
+    "typescript": "^5.8.2",
+    "vitest": "^3.2.4"
   }
 }