feat: created unit tests for the admin page using Jest

[Josue-SR]

Checklist:

• I have read freeCodeCamp's contribution guidelines.
• My pull request has a descriptive title (not a vague title like Update index.md)

Closes #128

Description:

• This PR has a new feature that can help with unit testing. It implements the Jest library, a popular testing library for React, that helps with mocking functions.
• I added a folder called test that contains all the test files. In the test folder, I have a file called admin.test.js that test to see if the admin page is secured. The test folder can be used for testing files in the future.
  The admin.test.js consist of one test that passes mock data to a function that verifies if the user is an admin. If the test passes then it means the user was an admin and can access the admin page.

(Run all tests: npm test)

[socket-security]

Socket Security Pull Request Report

Dependency issues detected. If you merge this pull request, you will not be alerted to the instances of these issues again.

😵‍💫 Bin script confusion

This package has multiple bin scripts with the same name. This can cause non-deterministic behavior when installing or could be a sign of a supply chain attack

Consider removing one of the conflicting packages. Packages should only export bin scripts with their name

Package	Bin script	Source
[email protected] (added)	jest	package.json
[email protected] (added)	jest	package.json via [email protected]

Pull request report summary

Issue	Status
Install scripts	✅ 0 issues
Native code	✅ 0 issues
Bin script confusion	⚠️ 2 issues
Bin script shell injection	✅ 0 issues
Unresolved require	✅ 0 issues
Invalid package.json	✅ 0 issues
HTTP dependency	✅ 0 issues
Git dependency	✅ 0 issues
Potential typo squat	✅ 0 issues
Known Malware	✅ 0 issues
Telemetry	✅ 0 issues
Protestware/Troll package	✅ 0 issues

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[GuillermoFloresV]

Hey Josue, can we try upgrading Jest to the latest version (29.3.1)? Maybe this is an issue with outdated dependencies.