Confused on Code Coverage for one trigger AttachmentTrigger, why am I getting 0% coverage?

Hello, I have a trigger that I think someone deployed with a Salesforce Labs app, it is very basic (I do not know apex very well). When I run all the tests through the developer console it shows we are at 80% coverage and this specific trigger gets 100% coverage. However, when I use a change set to deploy any Apex code I get the following error.

AttachmentTrigger, Details: Test coverage of selected Apex Trigger is 0%, at least 1% test coverage is required

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3 trigger AttachmentTrigger on Attachment (after insert) {
TriggerUtility.updateCaseLastActivity(Trigger.New,'attachment');
}

I am not sure where to start if I need to write a test class for this, any suggestions and any idea why there is a difference?

Thanks in advance
Michael

August 25, 2015
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Chandra Sekhar CH N V
You are calling updateCaseLastActivity from a utility class. What exactly you are performing in that method? If you need just inserting attachment in test methods, try using the below
Attachment attachment = new Attachment(); attachment.ParentId = parentId; (sObject ID) attachment.Name = 'Test Attachment for Parent'; attachment.Body = b; insert(attachment);

August 25, 2015
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Michael Webb 15
Thank you!! I am not sure what the trigger is doing, this is the first time I saw it. I tried your code and I am getting the following error.

Error: expecting a right parentheses, found 'ID' at line 8 column 45, which is right after sObject and before ID.

This is the full code.

Thanks!

@isTest public class attachmentTrigger_Test { @isTest public static void AttachmentTest(){ Test.startTest(); Attachment attachment = new Attachment(); attachment.ParentId = parentId; (sObject ID) attachment.Name = 'Test Attachment for Parent'; attachment.Body = b; insert(attachment);