test: setup test framework

It took me lots of time...
But it works!!!

.gitignore

@@ -1,6 +1,6 @@
 node_modules/
 dist/
-.__compile_cache__/
+coverage/
 package-lock.json
 yarn.lock
 !pnpm-lock.yaml

package.json

@@ -17,6 +17,11 @@
     "prepare": "husky",
     "script": "node dev/scripts/script.mjs",
     "serve": "node dev/scripts/script.mjs server",
+    "test": "web-test-runner",
+    "test:coverage": "web-test-runner --coverage",
+    "test:manual": "web-test-runner --manual",
+    "test:watch": "web-test-runner --watch",
+    "test:setup": "playwright install",
     "watch": "node dev/scripts/script.mjs watch",
     "watch:dev": "node dev/scripts/script.mjs watch --no-min-bundle"
   },
@@ -38,11 +43,31 @@
     "@babel/preset-env": "^7.26.0",
     "@commitlint/cli": "^19.6.0",
     "@commitlint/config-conventional": "^19.6.0",
+    "@esm-bundle/chai": "4.3.4-fix.0",
+    "@lit/reactive-element": "^2.0.4",
+    "@open-wc/semantic-dom-diff": "^0.20.1",
+    "@open-wc/testing": "^4.0.0",
+    "@open-wc/testing-helpers": "^3.0.1",
     "@rollup/plugin-babel": "^6.0.4",
     "@rollup/plugin-terser": "^0.4.4",
+    "@types/chai-dom": "^1.11.3",
+    "@types/mocha": "^10.0.10",
+    "@types/node": "^22.10.7",
+    "@types/sinon-chai": "^4.0.0",
+    "@web/dev-server": "^0.4.6",
+    "@web/dev-server-esbuild": "^1.0.3",
+    "@web/test-runner": "^0.19.0",
+    "@web/test-runner-commands": "^0.9.0",
+    "@web/test-runner-playwright": "^0.11.0",
+    "axe-core": "^4.10.2",
+    "chai-a11y-axe": "^1.5.0",
     "husky": "^9.1.7",
+    "lit": "^3.2.1",
+    "lit-element": "^4.1.1",
+    "lit-html": "^3.2.1",
     "prettier": "^3.4.2",
     "rollup": "^4.27.4",
+    "tslib": "^2.8.1",
     "typescript": "^5.7.2"
   }
 }