testsuite.php

<?php
namespace Test;

use PHPUnit_Framework_TestSuite;
use RecursiveDirectoryIterator;
use RecursiveIteratorIterator;
use RegexIterator;

class TestSuite extends PHPUnit_Framework_TestSuite
{
	/**
	 * Returns a suite containing all tests that will be run in this segment.
	 *
	 * @return void
	 */
	public static function suite()
	{
		$suite = new self('All Tests');
		$segment = getenv('TEST_SEGMENT');
		$segments = getenv('TEST_SEGMENTS');

		$directory = new RecursiveDirectoryIterator(__DIR__, RecursiveDirectoryIterator::SKIP_DOTS);
		$iterator = new RecursiveIteratorIterator($directory);
		$regex = new RegexIterator($iterator, '/^.+\Test.php$/i', RegexIterator::GET_MATCH);

		$files = [];
		foreach ($regex as $name => $file) {
			if (strpos('./FreshTest', $name) !== false) {
				continue;
			}
			$files[] = $name;
		}

		if (!$segment || !$segments) {
			foreach ($files as $name) {
				$suite->addTestFile($file);
			}
			return $suite;
		}
		echo "Running segment $segment of $segments\n";

		$chunked = array_chunk($files, ceil(count($files) / $segments));
		foreach ($chunked[$segment - 1] as $name) {
			$suite->addTestFile($name);
		}
		return $suite;
	}

}