Error: Call to undefined method IlluminateContainerContainer::basePath()
/myproject/vendor/laravel/framework/src/Illuminate/Foundation/helpers.php:182
/myproject/tests/Feature/DataCsvSeedTest.php:31
/myproject/vendor/phpunit/phpunit/src/TextUI/Command.php:195
/myproject/vendor/phpunit/phpunit/src/TextUI/Command.php:148

<?php
namespace TestsFeature;
use TestsTestCase;

class DataCsvSeedTest extends TestCase
{
   public function setUp()
   {
    $baseDir = base_path();
    print "basedir = ". $baseDir;
   }
}