add unit tests

package.json

@@ -19,6 +19,9 @@
     "scripts": {
         "clean": "rm -rf dist",
         "build": "yarn clean && vite build && tsc -p tsconfig.build.json",
+        "test": "vitest run",
+        "test:coverage": "vitest run --coverage --coverage.reporter=lcov --coverage.reporter=text-summary",
+        "test:watch": "vitest",
         "lint": "eslint .",
         "lint:fix": "eslint . --fix",
         "format": "prettier . --write",
@@ -35,17 +38,24 @@
     },
     "devDependencies": {
         "@eslint/js": "^10",
+        "@testing-library/dom": "^10.4.1",
+        "@testing-library/jest-dom": "^6.9.1",
+        "@testing-library/react": "^16.3.0",
         "@types/react": "^19.0.0",
+        "@types/react-dom": "^19.0.0",
         "@vitejs/plugin-react": "^5.0.0",
+        "@vitest/coverage-v8": "^4.0.18",
         "eslint": "^10",
-        "eslint-plugin-react-hooks": "^7.0.1",
+        "eslint-plugin-react-hooks": "^7.1.0-canary-ab18f33d-20260220",
         "eslint-plugin-react-refresh": "^0.5.1",
         "globals": "^17.3.0",
+        "jsdom": "^28.1.0",
         "prettier": "^3.8.1",
         "react": "^19.0.0",
         "react-dom": "^19.0.0",
         "typescript": "^5.6.2",
         "typescript-eslint": "^8.56.0",
-        "vite": "^7.0.0"
+        "vite": "^7.0.0",
+        "vitest": "^4.0.18"
     }
 }