code: public function expectMaximumCallCount($method, $count, $message = '%s')
      {
          $this->dieOnNoMethod($method, 'set maximum call count');
          $message .= Mock::getExpectationLine();
          $this->max_counts[strtolower($method)] =
                  new MaximumCallCountExpectation($method, $count, $message);
      }
docs: Sets the number of times a method may be called before a test failure is triggered.
  
  @param string $method        Method call to test.
  @param int $count            Most number of times it should have been called.
  @param string $message       Overridden message.