A method for unit testing of business processes for Web services, including steps of mapping the Web service description language (WSDL) elements of a process under test and its partner processes into equivalent Object-Oriented language (OO) elements, and performing testing on the process under test based on Object-Oriented unit testing frameworks. Each Web service interface of the process under test and its partner processes is mapped into an equivalent OO interface, partner stubs are generated on basis of the OO interfaces of the partner processes, WSDL binding and service port information are defined for the generated partner stubs, test cases are formed which contain test logic describing the service invocations between the process under test and its partner processes, and the test cases are executed, wherein the partner stub and its associated mock object collectively implement the service of a corresponding partner process.