Hi Vinit,

Yes - that is why I find this so puzzling - if the query returns a result in manual testing, why would it return 0 rows in automated test procedure? Also, If I actually run the code by performing the steps that a normal user would (i.e. creating a Technology Roadmap object), the code works properly and a new feed item is created within the chatterGroup Technology Roadmap. The only reason I am still struggling with this is because of SalesForce.com's insistence that I must have 75% code coverage in automated testing, otherwise I would have deployed this days ago.

Anyway, here is all the latest code with comments stripped out to be more concise.

Trigger:

trigger PostToChatterOnNewTechRoadmap on Technology_Roadmap__c (after insert) {

    CollaborationGroup chatterGroup = [SELECT Id FROM CollaborationGroup WHERE Name='Technology Roadmap' LIMIT 1];
    
	for (Technology_Roadmap__c trm : Trigger.new) {
		FeedItem fitem = new FeedItem();
		fitem.type = 'LinkPost'; //'TextPost,';
		fitem.ParentId = chatterGroup.id; //'0F9W0000000Ccge' = Sandbox; //'0F920000000PItQ' = Production;
		fitem.LinkUrl = '/' + trm.id;
		fitem.Title = 'New Technology Roadmap: ' + trm.Name;
		fitem.Body = 'Design Discipline: ' + ((trm.Design_Discipline__c != null) ? trm.Design_Discipline__c : 'Not specified')
					+ '\nCircuit Application: ' + ((trm.Circuit_Application__c != null) ? trm.Circuit_Application__c : 'Not specified')
					+ '\nSegment: ' + ((trm.Segment__c != null) ? trm.Segment__c + ((trm.Subsegment__c != null) ? ' => ' + trm.Subsegment__c : '') : 'Not specified');
		insert fitem;
	}
}

Test class:

@isTest
public class Test_trig_PostToChatterOnNewTechRoadmap{
    
    static testMethod void verifyPostToChatterOnNewTechRoadmap() {
        
        CollaborationGroup chatterGroup;
        List<CollaborationGroup> chatterGroups = [SELECT Id FROM CollaborationGroup WHERE Name='Technology Roadmap' LIMIT 1];
        if (chatterGroups.isEmpty()) {
            chatterGroup = new CollaborationGroup();
            chatterGroup.id = '0F9W0000000Cch3KAC';
        } else {
            chatterGroup = chatterGroups[0];
        }
    
        List<Technology_Roadmap__c> ltrm = new List<Technology_Roadmap__c>{};
        for (integer i=0; i<10; i++) {
            Technology_Roadmap__c trm = new Technology_Roadmap__c(Name = 'trigCoverageTest_' + i);
            trm.Design_Discipline__c = 'AC';
            System.debug('Name: ' + trm.Name);
            System.debug('Design Discipline: ' + trm.Design_Discipline__c);
            ltrm.add(trm);
        }
        
        test.startTest();
        insert ltrm;
        test.stopTest();
        
        List<FeedItem> lfi = [SELECT Title, Body FROM FeedItem WHERE ParentId = :chatterGroup.id ORDER BY Title];
        
        integer j = 0;
        string assTitle;
        for (FeedItem fi : lfi) {
            assTitle = 'New Technology Roadmap: trigCoverageTest_' + j++;
            System.debug(fi.Title);
            System.assertEquals(assTitle, fi.Title);
        }
    }
}

 Error message:

System.DmlException: Insert failed. First exception on row 0; first error: CANNOT_INSERT_UPDATE_ACTIVATE_ENTITY, PostToChatterOnNewTechRoadmap: execution of AfterInsert

caused by: System.QueryException: List has no rows for assignment to SObject

Trigger.PostToChatterOnNewTechRoadmap: line 3, column 1: []

Stack trace:

Class.Test_trig_PostToChatterOnNewTechRoadmap.verifyPostToChatterOnNewTechRoadmap: line 25, column 1

line 25 is the line:

insert ltrm;