function testValidAlternativeDatabaseName()
 {
     $prefix = defined('SS_DATABASE_PREFIX') ? SS_DATABASE_PREFIX : 'ss_';
     Config::inst()->update('SilverStripe\\Control\\Director', 'environment_type', 'dev');
     $this->assertTrue(DB::valid_alternative_database_name($prefix . 'tmpdb1234567'));
     $this->assertFalse(DB::valid_alternative_database_name($prefix . 'tmpdb12345678'));
     $this->assertFalse(DB::valid_alternative_database_name('tmpdb1234567'));
     $this->assertFalse(DB::valid_alternative_database_name('random'));
     $this->assertFalse(DB::valid_alternative_database_name(''));
     Config::inst()->update('SilverStripe\\Control\\Director', 'environment_type', 'live');
     $this->assertFalse(DB::valid_alternative_database_name($prefix . 'tmpdb1234567'));
     Config::inst()->update('SilverStripe\\Control\\Director', 'environment_type', 'dev');
 }