UserTest.php

<?php

// test/Unit/UserTest.php

namespace Tests\Unit;

use PHPUnit\Framework\TestCase;

class Password {
    protected $password = "";
    function __construct($password = "")
    {
        $this->password = $password;
    }
    public function validate(){
        if(strlen($this->password) < 8){
            throw new InvalidPasswordException();
        }
        if($this->get_strength() == 0){
            throw new InvalidPasswordException();
        }
    }
    public function get_strength(){
        $strength = 0;
        if(preg_match('/[A-Za-z]/', $this->password)){
            // Letter found!
            $strength +=1;
        }
        if(preg_match('/[0-9]/', $this->password)){
            // Digit found!
            $strength += 1;
        }
        return $strength;
    }
}

class PasswordTest extends TestCase{

    public function testOneDatatypePasswordGivesScoreOf1(){
        $pass = new Password("Foopassword");
        $strength = $pass->get_strength();
        $this->assertEquals(1, $strength);

        $pass = new Password("123123123");
        $strength = $pass->get_strength();
        $this->assertEquals(1, $strength);
    }

    public function testTwoDatatypePasswordGivesScoreOf2(){
        $pass = new Password("Foobar123");
        $strength = $pass->get_strength();
        $this->assertEquals(2, $strength);
    }

    public function testTwoDatatypePasswordGivesScoreOf0(){
        $pass = new Password("-");
        $strength = $pass->get_strength();
        $this->assertEquals(0, $strength);
    }
}