interview street test runner

interview_street_test_runner.php

<?php
/**
 * interview street test runner
 *
 * Test code should be in /test.php.
 * Tests should be unpacked under /tests.
 */
$dir=dirname(__FILE__) . "/tests";
$di=new DirectoryIterator($dir);

/** @var $fileinfo DirectoryIterator */
foreach($di as $fileinfo)
{
	if($fileinfo->isFile())
	{
		if(preg_match('~^input(\d+)~', $fileinfo->getFilename(), $matches))
		{
			$testNumber = $matches[1];
			$inFile = $fileinfo->getFilename();
			$outFile = $dir.'/output'.str_pad($testNumber, 2, '0').'.txt';
			$out=`php test.php<tests/$inFile`;
			$expected = file_get_contents($outFile);
			echo "Test $testNumber:\t";
			if(trim($expected) != trim($out))
			{
				echo "[FAIL]\n";
				echo "Expected:\n";
				echo $expected."\n";
				echo "Actual:\n";
				echo $out."\n";
			}
			else
			{
				echo "[PASS]\n";
			}
		}
	}
}