Batch class start method returning null, even after a record has been inserted in the test class

Question

I have a batch test class:

@isTest
public with sharing class TestBatchManagement {
    @isTest
    public static void batchManagementTest() {
        User u = TestDataFactory.createUserWithRoleLeader();
        
        Test.startTest();
        System.runAs(u) {
            List<Knowledge__kav> k = TestDataFactory.createKnowledgeExternalFAQ();
            
            Knowledge__kav kQuery = [
                SELECT id, createdByID, createdBy.UserRole.DeveloperName,LastModifiedBy.UserRole.DeveloperName,
                RecordType.DeveloperName
                FROM Knowledge__kav
                WHERE LastModifiedBy.UserRole.DeveloperName != 'Super' 
                AND ((LastModifiedBy.UserRole.DeveloperName= 'Leader' AND RecordType.DeveloperName != 'CC') OR LastModifiedBy.UserRole.DeveloperName != 'Leader')
                
            ];
        }
        BatchManagement bm = new BatchManagement();
        Database.executeBatch(bm);
        Test.stopTest();
    }
}

The problem is in the batch class the query locator returns no records. Even in the test class, if I do a query for Knowledge__kav, it returns List has no rows for assignment to SObject unless in the WHERE I add this id =: k[0].id.

Why is it so? And how can I solve this?

UPDATE:

doing KbManagement.PublishingService.publishArticle(kQuery.KnowledgeArticleId, false); in the test class did the trick. In the batch class, the start method returns the query and the inserted KAV's PublishStatus is Online. But unfortunately in the batch class I have condition where the KAV's PublishStatus has to Draft or Archived. So now I can return the KAV I created in test class through the batch's start method but because of the condition the code coverage is insufficient.

Answer 1

It seems the problem is with the Apex API version. The API version was 46 when the project started. Changing it version 48.0 worked.