OrlandoPHP Coding Dojo - 2011-10-06

main.php

<?php

class Solution {
	public function cool($val){
		if (($val % 3 ) == 0 || ($val % 5) == 0){
			return $val;
		} return 0;
	}
	function solveFor ( $limit )
	{
		$sum = 0;
		foreach ( range(0, $limit-1) as $value )
		{
			$sum += $this->cool($value);
		}
		
		return $sum;
	}
}

test.php

<?php

require_once 'PHPUnit/Autoload.php';
require_once 'main.php';

class Test extends PHPUnit_Framework_TestCase
{
    function test_ClassExists ( )
    {
    	$this->assertTrue(class_exists('Solution'));
        
    }
    
    function test_CoolMethodExists()
    {
  		$this->assertTrue(method_exists('Solution', 'cool'));
    }
    
    /**
     * @dataProvider provide_CoolMethodThatItReturnsGivenValIfDivBy3
     */
    function test_CoolMethodThatItReturnsGivenValIfDivBy3($value){
    	$expected = 0;
    	if(!$value%3){
    		$expected = $value;
    	}
    	$sol = new Solution;
    	$this->assertEquals($expected, $sol->cool($value));
    }
     /**
     * @dataProvider provide_CoolMethodThatItReturnsGivenValIfDivBy3
     */
    public function test_CoolMethodThatItReturnsGivenValIfDivBy5 ($value)
    {
    	
    	$expected = 0;
    	if(!$value%5){
    		$expected = $value;
    	}
    	$sol = new Solution;
    	$this->assertEquals($expected, $sol->cool($value));	
    }
    
    function provide_CoolMethodThatItReturnsGivenValIfDivBy3(){
    	return array(range(0,1000));
    }
    
    function test_solution_for_10 ( )
    {
    	$solution = new Solution;
    	
    	$this->assertEquals(23, $solution->solveFor(10));
    	$this->assertEquals(45, $solution->solveFor(15));
    	$this->assertEquals(233168, $solution->solveFor(1000));
    	//$this->assertEquals(233168, $solution->solveFor(100000));
		$this->assertEquals(233168, $solution->solveFor(1000));    
    }
}

if it weren't for the tests you could leverage php array functions and have a one liner.

// One liner. Bad form. Hard to document.
echo array_sum( array_marge( range(0,1000,3), range(0,1000,5) ) );

# Expanded

// All the numbers divisible by 3 from 0 to 1000
$threes = range( 0, 1000, 3 );

// All numbers divisible by 5 from 0 to 1000
$fives = range( 0, 1000, 5 );

// Merge into one list of unique "modulii" ;)
$list = array_merge( $threes, $fives );

// Our needed sum
echo array_sum( $list );