<?php

namespace Faker\Test\Provider\en_US;

use Faker\Provider\en_US\Company;
use Faker\Generator;

class CompanyTest extends \PHPUnit_Framework_TestCase
{

    /**
     * @var Generator
     */
    private $faker;

    public function setUp()
    {
        $faker = new Generator();
        $faker->addProvider(new Company($faker));
        $this->faker = $faker;
    }

    public function testEin()
    {
        for ($i = 0; $i < 100; $i++) {
            $number = $this->faker->ein;

            // should be in the format ##-#######, with a valid prefix
            $this->assertRegExp('/^(0[1-6]||1[0-6]|2[0-7]|[35]\d|[468][0-8]|7[1-7]|9[0-58-9])-\d{7}$/', $number);
        }
    }
}

<?php

namespace Faker\Test\Provider\en_US;

use Faker\Provider\en_US\Company;
use Faker\Generator;

class CompanyTest extends \PHPUnit_Framework_TestCase
{

    /**
     * @var Generator
     */
    private $faker;

    public function setUp()
    {
        $faker = new Generator();
        $faker->addProvider(new Company($faker));
        $this->faker = $faker;
    }

    public function testEin()
    {
        $number = $this->faker->ein;

        // should be in the format ##-#######, with a valid prefix
        $this->assertRegExp('/^(0[1-6]||1[0-6]|2[0-7]|[35]\d|[468][0-8]|7[1-7]|9[0-58-9])-\d{7}$/', $number);
    }
}

Drop loop in EIN test
Drop loop in EIN test