Explain Bottom-up approach of Software Testing?

Bottom up Testing

This testing technique comes under integration testing. In this testing approach programmer can interconnect sub programs without involving a main program due to main program is under construction. In the place of the under constructed main program the programmer can use a temporary code is called Driver. So, that lower level of components is to test first. In this testing the testing flow is from bottom to top.

The process repeated unless the components at the top level of the hierarchy are to be tested. Bottom up is more advantageous became it is easy to create driver rather creating a stub and can serve multiple purposes.

Example: If A, B & C are three Module, if Main module A is under construction. In this testing, the Developer can take the help of a Temporary program that called as Driver to check the communication between the modules.

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