#162948989 Descriptive Registration validation errors

[Hesbon5600]

What does this PR do?

- Email must be valid and unique
- Password must be alphanumeric
- Password must have an uppercase and lowercase letter
- Password must be at least 8 characters long
- Username must be unique

How should this be manually tested?
prerequisites:

Have postgres installed and running on localhost.

Follow the following steps:

1. Clone this repo with the following command:
   https://github.com/andela/ah-fulldeck.git

2. Cd into the ah-fulldeck directory:
   cd ah-fulldeck

3. Checkout to the branch ft-validate-signup-162948989 with the command:
   git checkout ft-validate-signup-162948989

4. Install the requirements by running the command:
   pip install requirements.txt

5. Create a database:
   create database fulldeck

6. Export the environment settings as follows:
   export DATABASE="fulldeck"
export USER="your postgres username "
export HOST="localhost"
export PASSWORD="your postgres password"

7. Migrate the models to the db:
   python manage.py migrate

8. Run the server:
   python manage.py runserver

9. From postman:
   Create a user by sending a post request to the '/api/user/' end point with the data body
   {
"user": {
"username" :"prefered name",
"email": "your email",
"password": "password"
}
}
   You can change the format of the email or password.
   Invalid email and password will result in a response message outlinging the fault.
   An existing username or email will also throw an error message

Any background context you want to provide?
None

What are the relevant pivotal tracker stories?
#162948989

Screenshots

1. Correct email and password format

2. Invalid email format

3. Password without a number or letter

[eduhmik]

Hey @Hesbon5600 keep up the good spirit... however on your PR in the steps to follow when testing add an option to install virtualenv for the application and how to activate it on both OS

[charitymarani]

The error messages are descriptive. Good work.

[Hesbon5600]

Okay @edhmik I'll do that

[kzyangiro]

@Hesbon5600 128 is alot, reset this to 30 max characters.

[Hesbon5600]

Okay sure

[kzyangiro]

at least 5? I thought in the implementation you used 8..

[Hesbon5600]

I think It should just be '# The username must be: unique'. Let me fix that.
The password is the one that must be at least 8 characters