As mobile cloud computing applications are becoming widely used to mitigate the limitations of mobile devices and exploit cloud services, testing these applications becomes critical. Testing mobile cloud application is complicated further due to dynamic assign of cloud resource to applications that run on mobile devices, due to the increased multiple factors in test case generations and execution. This paper will critically review the three related areas of mobile, cloud and mobile cloud applications testing, in terms of features and models. Furthermore, it will show the necessity of a mobile cloud computing applications testing model due to its uniqueness from both native mobile application testing models and cloud applications testing models. Based on this review, although testing mobile cloud computing applications is critical, there is currently no model to test mobile cloud computing applications.