faker = new Generator(); $this->faker->addProvider(new Company($this->faker)); } public function testBusinessIdentificationNumberIsValid() { $registrationDate = new \DateTime('now'); $businessIdentificationNumber = $this->faker->businessIdentificationNumber($registrationDate); $registrationDateAsString = $registrationDate->format('ym'); $this->assertRegExp( "/^(" . $registrationDateAsString . ")([4-6]{1})([0-3]{1})(\\d{6})$/", $businessIdentificationNumber ); } }