I my class I am getting by query , issue is in test class. 2nd thing is that necessary to be publish, in my class code i did not publish it but i am able to get by query but when i call same mehtod from test class, query  return to list has no rows exception?

my class code is something like this

product__kav article = new product__kav();

article.put('title', 'test');

String Urlname = NewString+''+System.now().getTime();
article.put('UrlName',Urlname);

..

insert article;
}
catch(Exception ex)
{
System.debug('Exception on article....'+ex.getMessage());
}

put all values for article , did not change Status to publish

 and fetch again in next line for getting of knwledge article and open a edit page directly by id (using page refrence)

KnowledgeArticle knowledgeObj = [SELECT ArticleNumber,createdDate FROM KnowledgeArticle order by  createdDate desc LIMIT 1];

i am getting knowledgeObj.id in my class when i run code on button click but when i call this in test class

like this calling above code

try
{
createArticle.createArticleOnCase(crCase.Id);
}

i got list has no rows to return mean while article product_kav is created i got that id on try block after insert and  i did not get knowledge article id for recent article same like when i run the code ....

is any concept is missing...?