Configuration value not found.
Author: Nicola Pietroluongo (nik.longstone@gmail.com)
Inheritance: extends RuntimeException
 public function testConfNotSupportedException()
 {
     $value = 'test';
     $e = new ConfValueNotFoundException($value);
     $message = sprintf('
         The configuration value "%s" is not present,
         be sure the configuration is loaded and the value is defined
         ', $value);
     $this->assertEquals($message, $e->getMessage(), 'A message should be generated');
 }