Added jest testing.

package.json

@@ -43,6 +43,7 @@
     "lint": "next lint --quiet",
     "prepare": "node -e \"if (process.env.NODE_ENV !== 'production'){process.exit(1)} \" || husky install",
     "postbuild": "node scripts/postbuild.js",
+    "test": "jest",
     "cypress-open": "cypress open cypress run",
     "cypress-run": "cypress run cypress run"
   },
@@ -129,6 +130,7 @@
     "@rollup/plugin-replace": "^5.0.2",
     "@svgr/rollup": "^8.1.0",
     "@svgr/webpack": "^8.1.0",
+    "@types/jest": "^29.5.12",
     "@types/node": "^20.9.0",
     "@types/react": "^18.2.41",
     "@types/react-dom": "^18.2.17",
@@ -148,6 +150,7 @@
     "eslint-plugin-prettier": "^4.0.0",
     "extract-react-intl-messages": "^4.1.1",
     "husky": "^8.0.3",
+    "jest": "^29.7.0",
     "lint-staged": "^14.0.1",
     "postcss": "^8.4.31",
     "postcss-flexbugs-fixes": "^5.0.2",
@@ -169,6 +172,7 @@
     "stylelint-config-prettier": "^9.0.3",
     "stylelint-config-recommended": "^14.0.0",
     "tar": "^6.1.2",
+    "ts-jest": "^29.1.2",
     "ts-node": "^10.9.1",
     "typescript": "^5.1.6"
   }