public function testable_grading_batch_operations_form($operation, $selectedusers)
{
global $CFG;
require_once $CFG->dirroot . '/mod/setask/gradingbatchoperationsform.php';
// Mock submit the grading operations form.
$data = array();
$data['id'] = $this->get_course_module()->id;
$data['selectedusers'] = $selectedusers;
$data['returnaction'] = 'grading';
$data['operation'] = $operation;
mod_setask_grading_batch_operations_form::mock_submit($data);
// Set required variables in the form.
$formparams = array();
$formparams['submissiondrafts'] = 1;
$formparams['duedate'] = 1;
$formparams['attemptreopenmethod'] = ASSIGN_ATTEMPT_REOPEN_METHOD_MANUAL;
$formparams['feedbackplugins'] = array();
$formparams['markingworkflow'] = 1;
$formparams['markingallocation'] = 1;
$formparams['cm'] = $this->get_course_module()->id;
$formparams['context'] = $this->get_context();
$mform = new mod_setask_grading_batch_operations_form(null, $formparams);
return $mform;
}