PHP User Group Kansas City May 6 - FizzBuzz using a switch statement

fizzbuzz.php

<?php
class FizzBuzz
{
    private $index;
    private $numbers;

    private $fizz;
    private $buzz;
    private $fizzbuzz;



    public function __construct()
    {
        $this->index = 0;

        $this->numbers = range(0, 100);
        $this->fizz = range(0, 100, 3);
        $this->buzz = range(0, 100, 5);
        $this->fizzbuzz = range(0, 100, 15);
    }

    public function runFizzBuzz()
    {
        array_map(array($this, 'testNumberSwitch'), $this->numbers);
    }

    protected function testFizz($index)
    {
        return in_array($index, $this->fizz);
    }

    protected function testBuzz($index)
    {
        return in_array($index, $this->buzz);
    }

    protected function testFizzBuzz($index)
    {
        return in_array($index, $this->fizzbuzz);
    }

    protected function testNumberSwitch()
    {
        switch ($this->index) {
            default:
                echo $this->index . "\r\n";
                break;
            case $this->testFizzBuzz($this->index) && ($this->index % 15) === 0:
                echo 'FizzBuzz' . "\r\n";
                break;
            case $this->testFizz($this->index) && ($this->index % 3) === 0:
                echo 'Fizz' . "\r\n";
                break;
            case $this->testBuzz($this->index) && ($this->index % 5) === 0:
                echo 'Buzz'. "\r\n";
                break;
        }

        $this->index++;
    }
}

$fizzBuzz = new FizzBuzz();
$fizzBuzz->runFizzBuzz();

FizzBuzzTest.php

// This was a very rudimentry start but since I hadn't gotten to finishing, I'm posting it now.
require(__DIR__ . '/../FizzBuzz.php');

class FizzBuzzTest extends PHPUnit_Framework_TestCase
{
    private $fizzBuzzOutput;

    public function __construct()
    {
        $fizzBuzz = new FizzBuzz();

        ob_start();
        $fizzBuzz->runFizzBuzz();

        $this->fizzBuzzOutput = ob_get_contents();
    }

    public function testFirstCharacterIsOne()
    {
        $this->assertEquals(0, $this->fizzBuzzOutput[0]);
    }
}