1. A method for unit testing of business processes for Web services, comprising the steps of: mapping Web service description language (WSDL) elements of a process under test and its partner processes into equivalent Object-Oriented language (OO) elements; forming test cases containing test logic which describes service invocations between the process under test and its partner processes, wherein mock objects of the OO interfaces of the partner processes are used to simulate services of the partner processes; and executing test cases, wherein each of said partner stubs and its associated mock objects collectively implement the service of a corresponding partner process.