Component- based software development is aimed for developing new software speedily by using minimum resources but outcome the maximum worth. Various components are integrated all together to form the successful software product therefore the quality of new software product completely depends upon these integrated components. To ensure the best quality of overall product, testing of each and every component is highly essential. But problems arise during testing when tester has limited access to the components. This paper discusses the importance of component testing and different problems during testing of such products. Some important strategies are also discussed in this paper and a contemporary layout for Component- based software testing is proposed.