deploy run test pass, but still display Test coverage of selected Apex Trigger is 0%, at least 1%

Question

deploy issue: run test pass, but when i deploy to production, it still display Test coverage of selected Apex Trigger is 0%, at least 1% test coverage is required, can anyone tell me what i miss here ?

Apex Trigger:

failed to deploy: message: "Test coverage of selected Apex Trigger is 0%, at least 1% test coverage is required"

trigger CreateNewTask10 on Lead (after insert) {

List<Task> lNewTasks = new List<Task>();
for (Integer i = 0; i < Trigger.new.size(); i++) {

         if (Trigger.new[i].Comments__c !=null) {
            lNewTasks.add(new Task(
                ActivityDate = Date.today().addDays(7),
                WhoID=Trigger.new[i].Id,
                Status = 'Not Started',
                type='Other',
                Priority='Normal',
                Subject='trigger add New Comment',
                description = Trigger.new[i].Comments__c
                ));
         }
        }

insert lNewTasks;

Apex class - test and pass

@isTest
 public class UnitTests_CreateNewTask10 {

  static testMethod void CreateNewTask10() {

  //Set up user
  User u1 = [SELECT Id FROM User WHERE Alias='auser'];

  test.startTest();

  //Run As U1
  System.RunAs(u1){

  Lead l = new Lead(
       FirstName='Test firstName',
       LastName = 'Test LastName', 
       Comments__c = '18888 test comments'
       );

  insert l;
  System.debug('Created and inserted lead');

  List<Task> tasks = new List<Task>();

  tasks.add(new Task(
     ActivityDate = Date.today().addDays(7),
     WhoId = l.Id,
     Status = 'Not Started',
     type='Other',
     Priority='Normal',
     Subject='trigger add New Comment',
     Description = l.Comments__c
  ));

  insert tasks;
  System.debug('Created and inserted task');

  Task Ttest = [SELECT Whoid, Description FROM Task WHERE Whoid=:l.Id Limit 1];

  system.assertEquals('18888 test comments', Ttest.Description);

  test.stopTest();

    } //end RunAs(u1)

  }

 }

Answer 1

Is there a reason you are running as another user. If there is no real reason it should be removed.

I removed that and then I recreated your code in my dev org and was able to deploy to another org without issues.

Answer 2

All triggers must have some amount of Test code coverage to get deployed .Your Trigger has 0% coverage as the error says .One reason i see here is you are running as some other user and he may not be system administrator profile.All triggers execute in admin context.Hence run your test class as System Admin

Answer 3

I had similar problem once. Deploy to test was fine but to production failed as described. I was deploying a small subset of all the classes but it was a complete set meaning none of the classes in the deploy set needed any class outside of the set. The problem is production deployment triggers a full test of all classes. Only way I could solve the issue is to deploy all classes in the system.

Your can read more about my attempts here: http://sforcehacks.blogspot.ca/2014/01/debug-statements-stopped-working-on.html