126632-01

126632-01

126632-01

If using this method, when testing a certain module X, it is necessary to design a driver module and several pile modules for it. The function of the driver module is to simulate the calling module of X, while the function of the pile module is to simulate the lower level module of X. For example, when testing module B in Figure 6.11, a driver module needs to be designed to transmit test data to module B and display the results generated by B. Additionally, since module B needs to call module E, a module named E needs to be designed to accept B's control and simulate E's functionality.

Another approach is incremental, which is not testing each module separately, but gradually connecting the modules to be tested with the modules that have already been tested. If incremental testing is used, the two steps of module testing and joint testing are combined.

There are various types of incremental forms, such as "top down" and "bottom up". If the program in Figure 6.11 adopts a "bottom-up" approach, modules E, C, and F are first tested sequentially or in parallel. At this time, a driver module needs to be prepared for each module, but there is no need to prepare a pile module. Then, a driver module is prepared for B to connect B and E for testing, and a driver module is prepared for D to connect D and F for testing. This process will continue until testing//module A.