QA: Check password

Write tests for the function checkPassword, which takes the string password and returns true for the valid password, and false for invalide.

Rules for the valid password:

• accepts only letters of the Latin alphabet Aa-Zz;
• at least 8 characters inclusive;
• maximum 16 characters inclusive;
• contains at least 1 digit, 1 special character, 1 uppercase letter.

Examples:

checkPassword('Password1!') === true
checkPassword('qwerty') === false
checkPassword('Str@ng') === false

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• Guideline;
• Read more about Jest expectations.