Abstract
We should employ a strategy to test product lines. Testing products individually is redundant for product lines since the products share a considerable amount of code. This document presents a survey of product line testing strategies based on the best available empirics out there. We found that, particularly, a testing strategy backed up with empirics is reusable component testing. Based on the empirics, we found that testing components in isolation will probably reduce the effort required on testing the whole product line compared to testing each product that is delivered to a customer from scratch, to achieve the same defect detection level.