Software testing interview question: what is the focus of unit testing, integration testing, and system testing?

unit testing 、 Integration testing 、 What is the focus of system testing ？ 

Unit testing is aimed at the smallest unit of software design -- Program modules （ In process oriented, it's functions 、 The process ; In object-oriented, classes .）, Carry out the test of correctness inspection , It's about finding out what's wrong with each program module . There are generally two steps : Manual static inspection \ Dynamic execution tracking  

Integration testing aims at testing the components integrated by each module that has passed the unit test , Its main content is the interface between each unit module , And the function of each module after integration . 

System testing is aimed at integrated software system , As an element of the whole computer system , With computer hardware \ peripherals \ Some support software \ Data is combined with other system elements such as people , In the actual running environment , Carry out a series of integration test and validation test for computer system .

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