What is Integration testing

1. What are the types of integration testing? 4 types of integration testing? Big bang testing: In this testing type, all the modules are integrated at once. The system is verified to ascertain whether it is working as expected, after integration. If the completely integrated module is identified with a defect, then it becomes a cumbersome process to know which module has caused the issue. Even if the defect is detected, fixing the same would cost quite high because the defect has been identified at a later stage. Top-down testing: The topmost module is tested first and then gradually moves to the lower modules. Important units are checked by testers so that crucial design flaws can be found. Unit testing is performed on only the top module. Gradually, one by one, the lower modules are integrated. Until all the modules are integrated and tested, this process will be repeated. Bottom-up testing: In this testing type, testing starts from the lowest module and then gradually moves towards the top module. Till all the modules are integrated, this testing continues and also ensures that the whole application is tested as a single unit. Sandwich/Hybrid testing: It is a combination of Bottom-up and top-down testing. In this type of testing, both bottom and top modules are tested at the same time. Both Stubs and Drivers are used in this testing method. Long-term applications and huge programs can be tested by this testing method. https://www.testingxperts.com/