Test during registration:
 - Check if all fields are filled
 - Valid email address
 - Strong password (8 Characters long, uppercase, lowercase, special char, number)
 - Confirm password
 - Email address already exists

Test during Login
 - Check if all fields are filled
 - check if email address exists
 - Valid email address exists
 - Check if password is correct
 - Check if a token is generated
 - Check if user can createa a post
 - check the user membership status