Im having trouble getting any test coverage on my trigger. I am getting 85% on the first class thats executed by my trigger, but I just cant seem to get any coverage at all on the actuall trigger.

Im thinking that part of the reason is since I am checking the users accessability to a custom object that I may need to create a user in the test? Not sure..

Im assuming I shouldnt be referencing an exsiting record to my custom object x_advertiser__c as well, instead creating that object and inserting it?

Anyways, any insight would be much appreciated.  The help here on the forums have been really great.

Heres the testmethod:

public class testxOpportunityGrab {

    private static testmethod void xOpportunityGrabTest() {
                
        Opportunity opportunity = new Opportunity (name = 'test', campaign_created_in_x__c = false,
                                                    stagename = 'Renew', closedate = system.today(), x_advertiser__c = 'a00U000000161iQIAQ',
                                                    campaign_start_date__c = Date.today(), campaign_end_date__c = Date.today() + 30);
        insert Opportunity;

        List<Opportunity> listOpportunity = new List<Opportunity>();
        listOpportunity.add(Opportunity);
        xOpportunityGrab.addOpportunityGrab(listOpportunity);
                
    }       
}

Hers the trigger:

trigger xCheckAdvertiserTrigger on Opportunity (before update) {
		
	for (Opportunity o:Trigger.new) {
		
		// Check to see if user has access to custom object x_advertiser__c
		Schema.DescribeFieldResult d = Opportunity.x_advertiser__c.getDescribe();
		Boolean usr = d.isAccessible();

	
		// If usr does, then continue through the process of executing the trigger
		if (usr == true) {
				
			// Instantiate passVarification vars
			Boolean passedVarification1;
			Boolean passedVarification2;
			Boolean passedVarification3;
			
			// Validate fields
			if (o.campaign_created_in_x__c == true && o.x_Advertiser__c == null) {
				o.campaign_created_in_x__c = false;
				o.x_Advertiser__c.addError('You must select an x Advertiser.');
			} else {
				passedVarification1 = true;
			}
			
			// Validate fields
			if (o.campaign_created_in_x__c == true && o.Campaign_Start_Date__c == null) {
				o.campaign_created_in_x__c = false;
				o.Campaign_Start_Date__c.addError('You must select a campaign start date before you can create the campaign in x.');
			} else {
				passedVarification2 = true;
			}
			
			if (o.campaign_created_in_x__c == true && passedVarification1 == true && passedVarification2 == true) {
				passedVarification3 = true;
			} else {
				passedVarification3 = false;
			}
			
			// If all validation passed then run the create campaign process
			if (passedVarification1 == true && passedVarification2 == true && passedVarification3 == true) {
				Opportunity[] opps = Trigger.new;
				//Call main x method
				xOpportunityGrab.addOpportunityGrab(opps);		
			}
			
			//System.debug(' passedVarification1 :::: '+passedVarification1);
			//System.debug(' passedVarification2 :::: '+passedVarification2);
			//System.debug(' passedVarification3 :::: '+passedVarification3);
			
		} else {
		
		}
		 
	}	

}

And heres the main class called by the trigger:

public class xOpportunityGrab {
             
    public static void addOpportunityGrab(Opportunity[] opps) {
    
        for (Opportunity o: opps) {
                                  
            // Set campaign checkbox to true if flase
            o.campaign_created_in_x__c = true;
            
            // Use Opportunity name as campaign name
            String xCampaignName = string.valueOf(o.name);
            
            // Grab saleforce Id to use for query
            ID sf_xAdvertiserId = o.x_Advertiser__c;
            
            // Query to determine the value of Opportunity x advertiser Id
            string query = 'Select x_advertiserId__c from x_advertiser__c where id =\'' +sf_xAdvertiserId+'\' ';
            
            // Create object to hold Id Value
            sObject advIdObject = Database.query(query);
            
            // Extract Id from object
            String xAdvertiserID = string.valueof(advIdObject.get(x_Advertiser__c.x_AdvertiserId__c));
            
            // Get opportunity owner Full name
            Opportunity oo = [Select oo.Owner.name, oo.OwnerId From Opportunity oo where oo.Id = :opps];
			String ownerName = String.valueOf(oo.Owner.name);
            
            // Campaign start date from custom field
            String xCampaignStartDate;
            
            // Check for missing Start date, if true campaign start date is today
            if (string.valueOf(o.campaign_Start_Date__c) == null) {
                xCampaignStartDate = String.valueOf(system.today());
            	} else {
            	xCampaignStartDate = String.valueOf(o.campaign_start_date__c);
            }
            
            // Campaign end date from custom field
            String xCampaignEndDate;
            
            if (string.valueOf(o.campaign_End_Date__c) == null) {
            	xCampaignEndDate = '';
            	} else {
            	xCampaignEndDate = String.valueOf(o.campaign_end_date__c);
            }
                   
            // Callout to xml api process
            if (!Test.isRunningTest()) {
                xXmlApiCall.sendRequest(xCampaignName, ownerName, xAdvertiserID, xCampaignStartDate, xCampaignEndDate);
            }            
            
        }        
    }
}