npm run test 

> reactjs_koans@1.0.0 test
> npm run compile && mocha -b --compilers js:babel/register --require test/helpers.js test/**/*.js || echo


> reactjs_koans@1.0.0 compile
> babel exercises --out-dir src

exercises/01-HelloWorld.jsx -> src/01-HelloWorld.js
exercises/02-PartiesList.jsx -> src/02-PartiesList.js
exercises/03-WhatsYourName.jsx -> src/03-WhatsYourName.js
exercises/04-Quiz.jsx -> src/04-Quiz.js
exercises/05-Challenge-GroceryList-part-1.jsx -> src/05-Challenge-GroceryList-part-1.js
exercises/05-Challenge-GroceryList-part-2.jsx -> src/05-Challenge-GroceryList-part-2.js
exercises/05-Challenge-GroceryList-part-3.jsx -> src/05-Challenge-GroceryList-part-3.js
exercises/05-Challenge-GroceryList-part-4.jsx -> src/05-Challenge-GroceryList-part-4.js
exercises/06-RenderComponent.jsx -> src/06-RenderComponent.js
exercises/07-LifecycleMethods.js.jsx -> src/07-LifecycleMethods.js.js
exercises/main.jsx -> src/main.js
/Users/meetverma/Documents/contributions/reactjs_koans/test/helpers.js:10
global.navigator = { userAgent: "Node.JS" };
                 ^

TypeError: Cannot set property navigator of #<Object> which has only a getter
    at Object.<anonymous> (/Users/meetverma/Documents/contributions/reactjs_koans/test/helpers.js:8:17)
    at Module._compile (node:internal/modules/cjs/loader:1375:14)
    at normalLoader (/Users/meetverma/Documents/contributions/reactjs_koans/node_modules/babel-core/lib/api/register/node.js:199:5)
    at Object.require.extensions.<computed> [as .js] (/Users/meetverma/Documents/contributions/reactjs_koans/node_modules/babel-core/lib/api/register/node.js:216:7)
    at Module.load (node:internal/modules/cjs/loader:1206:32)
    at Function.Module._load (node:internal/modules/cjs/loader:1022:12)
    at Module.require (node:internal/modules/cjs/loader:1234:19)
    at require (node:internal/modules/helpers:176:18)
    at /Users/meetverma/Documents/contributions/reactjs_koans/node_modules/mocha/bin/_mocha:311:3
    at Array.forEach (<anonymous>)
    at Object.<anonymous> (/Users/meetverma/Documents/contributions/reactjs_koans/node_modules/mocha/bin/_mocha:310:10)
    at Module._compile (node:internal/modules/cjs/loader:1375:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1434:10)
    at Module.load (node:internal/modules/cjs/loader:1206:32)
    at Function.Module._load (node:internal/modules/cjs/loader:1022:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:142:12)
    at node:internal/main/run_main_module:28:49

Node.js v21.5.0