trigger chatter_answers_question_escalation_to_case_trigger on Question (after update) {
    for (Question q: Trigger.new) {
        try {
            if (q.Priority == 'high' && (q.Cases == null || q.Cases.size() == 0) && Trigger.oldMap.get(q.id).Priority != 'high') {
                q = [select Id, Title, Body, CommunityId, createdById, createdBy.AccountId, createdBy.ContactId from Question where Id = :q.Id];
                Case newCase = new Case(Origin='Chatter Answers', OwnerId=q.CreatedById, QuestionId=q.Id, CommunityId=q.CommunityId, Subject=q.Title, Description = (q.Body == null? null: q.Body.stripHtmlTags()), AccountId=q.CreatedBy.AccountId, ContactId=q.CreatedBy.ContactId);
                insert newCase;
            }
        } catch (Exception e) {
            //In case you have issues with code coverage for this section, you can move this to a separate helper class method which can be tested separately
            Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
            mail.setReplyTo('no-reply@salesforce.com');
            mail.setSenderDisplayName('Salesforce Chatter Answers User');

            // The default sender is the portal user causing this trigger to run, to change this, set an organization-wide address for
            // the portal user profile, and set the ID in the following line.
            // mail.setOrgWideEmailAddressId(orgWideEmailAddressId);
            mail.setToAddresses(new String[] { Site.getAdminEmail() });
            mail.setSubject('Case Escalation exception in site ' + Site.getName());
            mail.setPlainTextBody('Case Escalation on Question having ID: ' + q.Id + ' has failed with the following message: ' + e.getMessage() + '\n\nStacktrace: ' + e.getStacktraceString());
            Messaging.sendEmail(new Messaging.SingleEmailMessage[] { mail });
        }
    }
}

@isTest(seealldata=true)
public class  test_chatter_answers_question
{
 static testMethod void test_chatter_answers_question(){
 	
 	
 Question  q = new Question(Title='test', Body='test', CommunityId='09a800000000w1dAAA', createdById='00580000007lJUbAAM');
 
 insert q;
 
 Case newCase = new Case(Origin='Chatter Answers', OwnerId=q.CreatedById, QuestionId=q.Id, CommunityId=q.CommunityId, Subject=q.Title, Description = (q.Body == null? null: q.Body.stripHtmlTags()), AccountId=q.CreatedBy.AccountId, ContactId=q.CreatedBy.ContactId);
                
 insert newCase;
 }
}