Coding Dojo at Orlando PHP 2013-04-04

main.php

<?php

/**
 * Imagine a hallway (from the Matrix) with 50 doors on each side.
 * Take a walk down the hallway and back up, opening every door.
 * On a second pass, close all the even numbered doors.
 * The third pass, each third door, close it if it's open and open if it's closed.
 * Repeat.
 * What is the state of the doors after 100 passes?
 */

class Hallway implements Countable, Iterator
{
    protected $index = 0;
    
    protected $doors = array(false, false);
    
    function count()
    {
        return 10;
    }
    
    function current() 
    {
        return $this->doors[$this->index];
    }
    
    function next() 
    {
        $this->index++;
    }
    
    function key() 
    {
        return $this->index;
    }
    
    function valid()
    {
        return isset($this->doors[$this->index]);
    }
    
    function rewind()
    {
        $this->index = 0;
    }
}

test.php

<?php

require_once 'main.php';

class Test extends PHPUnit_Framework_TestCase
{
    function test_something ( )
    {
        //$this->assertTrue(false, 'This will never work');
        
        //$this->assertEquals(true, false, 'Some message');
        
        //$this->assertFalse((boolean) 0);
    }
    
    function test_that_we_have_a_hallway()
    {
        $this->assertTrue(class_exists('Hallway'),
            'We should have a class called "Hallway"');
        
        $this->assertCount(10, new Hallway);
        
        $hallway = new Hallway();
        
        $this->assertEquals($hallway->doors[0], false, "Door must be closed by default");
        
        $this->assertEquals($hallway->doors[1], false);
        
        foreach($hallway as $door) $this->assertFalse($door);
        
        $hallway->next();
        
        $this->assertTrue($hallway->previous(), true, "The last door is still closed");
        
    }
}

Thanks Dave