public function testProviderMethodMACAddress() { $value = GiiantFaker::string('macAddress'); $this->specify('returned value is MAC address as string', function () use($value) { expect('value is not empty', $value)->notEmpty(); expect('value is string', is_string($value))->true(); expect('value is valid MAC address', filter_var($value, FILTER_VALIDATE_MAC) !== false)->true(); }); }