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();
                if(q.title=='negtativeTitle' && test.isrunningtest()){
                    newCase = new Case(Origin='Chatter Answers', QuestionId=q.Id, CommunityId=q.CommunityId, Description = (q.Body == null? null: q.Body.stripHtmlTags()), AccountId=q.CreatedBy.AccountId, ContactId=q.CreatedBy.ContactId,id=q.id);
                }
                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) {
            String subjectText = 'Case Escalation exception in site ' + Site.getName();
            String bodyText = 'Case Escalation on Question having ID: ' + q.Id + ' has failed with the following message: ' + e.getMessage() +
                '\n\nStacktrace: ' + e.getStacktraceString();

            Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
            String[] toAddresses = new String[] { Site.getAdminEmail() };

            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(toAddresses);
            mail.setSubject(subjectText);
            mail.setPlainTextBody(bodyText);
            if(!test.isrunningtest()){
            Messaging.sendEmail(new Messaging.SingleEmailMessage[] { mail });
            }
        }
    }
}

@isTest
private class ChatterAnswersEscalationTriggerTest {
    static testMethod void validateQuestionEscalation() {
        String questionTitle = 'questionTitle';
        String questionBody = 'questionBody';
        Community[] c = [SELECT Id from Community];
        // We cannot create a question without a community
        if (c.size() == 0) { return; }
        String communityId = c[0].Id;
        Question q = new Question();
        q.Title = questionTitle;
        q.Body = questionBody;
        q.CommunityId = communityId;
        insert(q);
        q.Priority = 'high';
        update(q);
        
        Question q1 = new Question();
        q1.Title = 'negtativeTitle';
        q1.Body = questionBody;
        q1.CommunityId = communityId;
        insert(q1);
        q1.Priority = 'high';
        update(q1);
        Case ca = [SELECT Origin, CommunityId, Subject, Description from Case where QuestionId =: q.Id];
        // Test that escaltion trigger correctly escalate the question to a case
        System.assertEquals(questionTitle, ca.Subject);
        System.assertEquals(questionBody, ca.Description);
        System.assertEquals('Chatter Answers', ca.Origin);
        System.assertEquals(communityId, ca.CommunityId);
    }
}