Top-down integration testing is an incremental approach to construction of program structure. Modules are integrated by moving downward through the control hierarchy, beginning with the main control module. Modules subordinate to the main control module are incorporated into the structure in either a depth-first or breadth-first manner.
1. The Integration process is performed in a series of five steps:
2. The main control module is used as a test driver and stubs are substituted for all components directly subordinate to the main control module.
3. Depending on the integration approach selected subordinate stubs are replaced one at a time with actual components.
4. Tests are conducted as each component is integrated.
5. On completion of each set of tests, stub is replaced with the real component.
6. Regression testing may be conducted to ensure that new errors have not been introduced.
Tuesday, January 20, 2009
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