PHP Exercise

oktoberfest.php

<?php

require_once 'participant.php';

$bob  = new Participant('Bob');
$bill = new Participant('Bill');

$bob->surviveOktoberfest();
$bill->surviveOktoberfest();

echo "\n";
echo 'Bierspesen Bob: ' . sprintf("%.2f", $bob->getTotalCost()/100.0) . " CHF\n";
echo 'Bierspesen Bill: ' . sprintf("%.2f", $bill->getTotalCost()/100.0) . " CHF\n";
echo 'Literverbrauch Bob: ' . $bob->getTotalConsumption() . "\n";
echo 'Literverbrauch Bill: ' . $bill->getTotalConsumption() . "\n";

participant.php

<?php
/** "Oktober-Fest" Example:
 * During 3.5h Bill & Bob are ordering every hour 1l of beer.
 * 1l of beer costs 14.95CHF.
 * They toast themselves to each new round: "Prost!"
 */

class Participant {

    public $duration;
    public $total_cost        = 0;
    public $total_consumption = 0;

    function __construct($name, $duration=3.5, $beer_price=1495, $beer_per_hour=1) {
        $this->name          = $name;
        $this->duration      = $duration;
        $this->beer_price    = $beer_price;
        $this->beer_per_hour = $beer_per_hour;
    }

    public function toast() : string {
        return "Prost!";
    }

    public function order() : void {
        $this->total_cost        += $this->beer_price;
        $this->total_consumption += $this->beer_per_hour;
    }

    public function getTotalCost() : int {
        return $this->total_cost;
    }

    public function getTotalConsumption() : int {
        return $this->total_consumption;
    }

    public function surviveOctoberFest() : void {
        for ($i = 0; $i < ceil($this->duration); $i++) {
            $this->order();
            echo $this->toast();
        }
    }
}

participant_test.php

<?php

class ParticipantTest extends PHPUnit\Framework\TestCase
{
    public static function setUpBeforeClass() : void
    {
        require_once 'participant.php';
    }

    public function setUp() : void {
        $this->bob        = new Participant('Bob');
        $this->beer_price = 1495;
    }

    public function testGetDuration() : void {
        $this->assertEquals(3.5, $this->bob->duration);
    }

    public function testGreeting() : void {
        $this->assertEquals("Prost!", $this->bob->toast());
    }

    public function testGetTotalCost() : void {
        $this->assertEquals(0, $this->bob->getTotalCost());
        $this->bob->order();
        $this->assertEquals($this->beer_price, $this->bob->getTotalCost());
        $this->bob->order();
        $this->assertEquals(($this->beer_price * 2), $this->bob->getTotalCost());
    }

    public function testGetTotalConsumption() : void {
        $this->assertEquals(0, $this->bob->getTotalConsumption());
        $this->bob->order();
        $this->assertEquals(1, $this->bob->getTotalConsumption());
        $this->bob->order();
        $this->assertEquals(2, $this->bob->getTotalConsumption());
    }
}