In an ideal world, dependant components are always available to developers for testing their software. In the real world however, security, privacy, cost, and other set backs make testing API and cloud based applications a nightmare. Developers face the challenge of writing complex applications which are dependant on multiple components.
Opening up channels of communication, building components concurrently, and frequent testing can help meet the challenge faced by developers to a great extent. Independently testing single units of code may ensure that each code works fine independently, however it is important to test the codes with all the components as a complete system. This can delay the process of software development considerably as developers wait for dependant components to be made available. Service virtualisation is the answer to this problem. It can considerably speed up the process of software development.