code: public function expectAtLeastOnce($method, $args = false, $message = '%s')
      {
          $this->expectMinimumCallCount($method, 1, $message);
          if ($args !== false) {
              $this->expect($method, $args, $message);
          }
      }
docs: Convenience method for requiring a method call.
  
  @param string $method       Method call to track.
  @param array $args          Expected argument list or false for any arguments.
  @param string $message      Overridden message.