Password Validator kata

The purpose of this project is to introduce developers to mocking using PHPUnit.

Setup

Here are the steps you need to go through to get the tests running. If you are having trouble then refer to the project Sample PHPUnit Setup

Requirements

Virtual Machine (preference)

You need to install vagrant on your machine.

Then from this directory provision the VM and log in to it:

vagrant up
vagrant ssh

This will provision a VM running Ubuntu 18.04. It will install PHP 7.2 and composer. Finally it will run composer.

Once logged into the VM run PHPUnit:

cd /vagrant/sample-unit-test-project
./vendor/bin/phpunit

You should see an output along the lines of:

PHPUnit 7.0.1 by Sebastian Bergmann and contributors.

.                                                                   1 / 1 (100%)

Time: 193 ms, Memory: 4.00MB

OK (1 test, 1 assertion)

The important bit is the OK (1 test, 1 assertion). If you see that then you've installed everything correctly to run PHPUnit!

Local

Install the following:

• PHP 7.2 or higher
• Composer

In the root directory of the project run composer. This will pull down all the dependencies:

composer install

You should now be able to run the unit tests. From the root directory of this project run:

./vendor/bin/phpunit

You should see an output like this:

PHPUnit 7.0.1 by Sebastian Bergmann and contributors.



Time: 56 ms, Memory: 2.75MB

OK (1 test, 1 assertion)

The important bit is OK (1 test, 1 assertion) this means the tests have run successfully.

Challenge 1

Write tests and code to fulfil the functionality as per comment in src/PasswordValidator/PasswordValidator.php.

Challenge 2

A team has developed a password strength calculator. The interface to which can be found at src/PasswordStrengthCalculator/PasswordStrengthCalculator.php. Add an additional requirement that the password's strength must be 3 or greater for the password to be deemed valid.

Challenge 3

Add an additional requirement that the password can not be one of the User's previous 5 passwords.

For the scope of this just create a dummy User class and an interface PreviousPasswordCheckerInterface for checking the the password has been previously used.