//TEST dla user
<?php

if (!isset($_SESSION)) $_SESSION = array();

require __DIR__ . '/../User.php';

use    PHPUnit\Framework\TestCase;

class UserTest extends TestCase
{
    protected function setUp()
    {
        $_SESSION = [];
    }

    protected $backupGlobalsBlacklist = array('_SESSION');

    public function testUserRegister()
    {
        $user = new User();
        $this->assertFalse($user->register('sanjiisan', 'sh', '123'));//Password to short

        $user->register('sanjiisan', 'zaq1@WSX12', '94030711616');
        $this->assertFalse($user->register('sanjiisan', 'password', '465465456'));

        $usersList = [
            [
                'login' => 'sanjiisan',
                'pass' => 'zaq1@WSX12',
                'pesel' => '94030711616'
            ]
        ];

        $this->assertEquals($usersList, $user->getUsers());
    }


    public function testLoginUser()
    {
        $user = new User();
        $user->register('sanjiisan', 'zaq1@WSX12', '94030711616');

        $this->assertFalse($user->login('sanjiisan', 'wrong_password'));
        $this->assertFalse($user->login('not_exist', 'pass'));

        $this->assertEquals($user, $user->login('sanjiisan', 'zaq1@WSX12'));

        $this->assertEquals(serialize([
            'login' => 'sanjiisan',
            'pass' => 'zaq1@WSX12',
            'pesel' => '94030711616'
        ]), $_SESSION['user']);
    }


    public function testChangeData()
    {
        $user = new User();
        $user->register('sanjiisan', 'zaq1@WSX12', '94030711616');

        $this->assertFalse($user->changeData('tomek', 'qweqwe', '123456789'));

        $user->login('sanjiisan', 'zaq1@WSX12');

        $this->assertEquals($user, $user->changeData('tomek', 'qweqwe', '123456789'));

        $this->assertEquals(serialize([
            'login' => 'tomek',
            'pass' => 'qweqwe',
            'pesel' => '123456789'
        ]), $_SESSION['user']);

        $usersList = [
            [
                'login' => 'tomek',
                'pass' => 'qweqwe',
                'pesel' => '123456789'
            ]
        ];

        $this->assertEquals($usersList, $user->getUsers());
    }
}

///klasa usera
<?php

class User
{
    private $registeredUsers = [];

    public function register($login, $pass, $pesel)
    {
        if (strlen($pass) < 3) {
            return false;
        }

        $user = $this->getUser($login);
        if ($user) {
            return false;
        }

        $this->registeredUsers[] = [
            'login' => $login,
            'pass' => $pass,
            'pesel' => $pesel
        ];
    }

    public function getUsers()
    {
        return $this->registeredUsers;
    }

    public function login($login, $pass)
    {
        $userToLogin = $this->getUser($login, $pass);

        if (!$userToLogin) {
            return false;
        }

        $_SESSION['user'] = serialize([
            'login' => $userToLogin['login'],
            'pass' => $userToLogin['pass'],
            'pesel' => $userToLogin['pesel']
        ]);

        return $this;
    }

    public function changeData($login, $pass, $pesel)
    {
        if (!isset($_SESSION['user'])) {
            return false;
        }

        $loggedInUser = unserialize($_SESSION['user']);
        foreach ($this->registeredUsers as &$user) {
            if ($user['login'] === $loggedInUser['login']) {
                $user['login'] = $login;
                $user['pass'] = $pass;
                $user['pesel'] = $pesel;

                break;
            }
        }

        $_SESSION['user'] = serialize([
            'login' => $login,
            'pass' => $pass,
            'pesel' => $pesel
        ]);

        return $this;
    }

    private function getUser($login, $password = null)
    {
        foreach ($this->registeredUsers as $user) {
            if ($user['login'] === $login) {
                if ($password !== null) {
                    if ($user['pass'] === $password) {
                        return $user;
                    } else {
                        return false;
                    }
                } else {
                    return $user;
                }
            }
        }

        return false;
    }
}