/**
  * Testing that a log file is generated when logging is turned on.
  */
 public function test_handle_log()
 {
     global $CFG;
     $this->resetAfterTest();
     $handler = new service_exception_handler(true);
     ob_start();
     $handler->handle(new Exception('Error happened'));
     ob_end_clean();
     $this->assertTrue(is_dir($CFG->dataroot . '/temp/mod_lti'));
     $files = glob($CFG->dataroot . '/temp/mod_lti/mod_lti_response*');
     $this->assertEquals(1, count($files));
 }