test: add unit tests generated by ToTheos

[ToTheos-Dev]

AI-Generated Unit Tests

This PR adds AI-generated unit tests to improve coverage and ensure key functionality is tested.

Test coverage summary

Statements : 93.27% ( 111/119 )
Branches   : 92.85% ( 13/14 )
Functions  : 61.9% ( 26/42 )
Lines      : 92.23% ( 95/103 )

Coverage metrics generated by Jest, an open-source JavaScript testing framework.

Test files and commits

• test: add config
• test: add src/pages/translation-methods.test.tsx
• test: add src/pages/index.test.tsx
• test: add src/pages/_document.test.tsx
• test: add src/pages/_app.test.tsx
• test: add src/tolgee.test.ts
• test: add src/components/LangSelector.test.tsx
• test: add src/components/Namespaces.test.tsx
• test: add src/components/Navbar.test.tsx
• test: add src/views/TranslationMethods.test.tsx
• test: add src/views/Todos.test.tsx

How to run tests

Jest is included as a dev dependency.

Run tests directly

./node_modules/.bin/jest

Optional: add npm scripts

You can add convenient scripts to package.json:

{
  "scripts": {
    "test": "jest",
    "test:watch": "jest --watch",
    "test:coverage": "jest --coverage --coverageReporters=text-summary"
  }
}

Usage examples

Run tests once:

npm test

Run tests in watch mode during development:

npm run test:watch

Run tests with coverage summary:

npm run test:coverage

---

This contribution was created with assistance from ToTheos (https://totheos.com) to support test generation, code refactoring, and pull request preparation for an open-source codebases.

The tool was used to automate routine software development tasks.

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