public with sharing class OutOfOffice {

    ApexPages.StandardSetController setCon;
    
    List<string> caseIds = new List<string>();
    
    List<Case> caseList = new List<Case>();
    
    public Case c;

    public Case getNewCase() {
    
        if(c == null){
            
            c = new Case();
        }
        
        return c;
    }
    
    public OutOfOffice (Apexpages.StandardSetController controller) {
    
        setCon = controller;
    
        caseIds = ApexPages.currentPage().getParameters().get('recs').split(',',-2);
    }
    
    public List<Case> getSelected() {
    
        caseList = [SELECT Subject,CaseNumber,Status FROM Case WHERE Id IN: caseIds];
    
        return caseList;
    }
    
    public Pagereference updateCases(){
    
        List<Case> updatedCases = new List<Case>();
        
        for(Case cse : caseList){
        
            cse.Out_Of_Office_Start__c = c.Out_Of_Office_Start__c;
            
            cse.Out_Of_Office_End__c = c.Out_Of_Office_End__c;
            
            cse.Out_Of_Office__c = c.Out_Of_Office__c;
            
            updatedCases.add(cse);
        }
        
        update updatedCases;

        return new Pagereference('/'+Case.getSObjectType().getDescribe().getKeyPrefix()+'?fcf='+ApexPages.currentPage().getParameters().get('retUrl'));
    }
    
    public Pagereference cancelUpdate(){

        return new Pagereference('/'+Case.getSObjectType().getDescribe().getKeyPrefix()+'?fcf='+ApexPages.currentPage().getParameters().get('retUrl'));
    }
}

@isTest
private class OutOfOfficeTest{

    private static testmethod void testOutOfOffice() {
    
        // CREATE AND INSERT TEST CONTACT
        
        Contact con = new Contact (LastName = 'Smith', FirstName = 'Joe', Email = 'joesmith@test.com');
        
        insert con;
        
        
        // CREATE START AND END DATES
        
        Date startDate = date.today();
        
        Date endDate = startDate.addDays(1);
    
        
        // CREATE AND INSERT NEW CASE
        
        Case c = new Case(
        
            Out_Of_Office__c = true,
            Out_Of_Office_Start__c = startDate,
            Out_Of_Office_End__c = endDate,
            ContactId = con.Id
        );
        
        insert c;
    
        
        // CREATE AND INSERT NEW EMAIL
        
        EmailMessage em = new EmailMessage(
            FromAddress = 'test@example.com',
            Incoming = true,
            ToAddress = 'test@gmail.com',
            Subject = 'Test email',
            TextBody = 'Hello',
            ParentId = c.Id
        );
        
        insert em;
        
    
        // CREATE AND INSERT TEST CASE COMMENT
        
        CaseComment com = new CaseComment (
        
            CommentBody = 'test',
            ParentId = c.Id,
            IsPublished = true
        );    
        
        insert com;   
    }
}