Test Driven Development - user registration system

The task is to add user registration functionality to the program using test driven development.

How to get the project

To solve the task, proceed as follows:

1. Fork this repository on to your account
2. Clone the forked repo to your computer using git clone URL
3. Run npm install to instal all needed packages
4. Add Jest testing package npm install jest
5. Add Jest script to package.json:

"scripts": {
   "test": "jest"
}

6. Make all necessary changes - write tests and code according to TDD
7. Confirm all changes with test run: npm run test or npx jest
8. Commit your changes and make a pull request for the original repo on GitHub
9. Grade (1p) is awarded to students:
   • who made the pull request with finished tests and validation code

Business requirements

Username

• Username can be 6-30 characters long.
• Username can contain letters, numbers, and periods.

Password

• Password has to be at least 8 characters long.
• Password should contain at least one lowercase and one uppercase letter.
• Password should contain at least one number.