Software testing - the concept of testing, the detailed introduction of unit testing, and how to design test cases

Do you really understand testing ？

As a test engineer , You must master the key technology of designing, developing and testing infrastructure . Third , With the scale of automated testing , Various problems of test data preparation are gradually exposed and enlarged , Become a factor that affects the efficiency and stability of automated testing “ Land Rover ”. Early traditional test data preparation methods , Whether it's from the time cost of test data preparation , From the stability of test data and the convenience of test data creation , Have been difficult to adapt to the requirements of large-scale automated testing . therefore , You have to think systematically about how to make the preparation of test data a tool , As a service , Finally, the platform will be realized . Through the study of this column , I hope you will be able to cope with these trends and challenges , And can keep up with the new trend of test technology development .
For Test Engineer , Your goal is to ensure that the functions of the system in various application scenarios meet the design requirements , So you need to think about more test cases 、 More comprehensive , Equivalence class division , Boundary value analysis method Heihe test method

Equivalence class division method , Is to divide all possible input data into several subsets , In each subset , If any of the input data has the same effect on exposing potential errors in the program , Then such subsets constitute an equivalence class . In the future, we only need to select any value from each equivalence class to test , We can use a small number of representative test inputs to achieve better test coverage results . Boundary value analysis method , Is to select input 、 The output boundary value is tested . Because usually a lot of software errors occur at the boundary of the input or output range , So we need to test the boundary value , Usually the choice is exactly equal to 、 Just greater than or just less than the boundary value as test data .
Test the boundary values of input and output , A large number of software errors occur at the boundary of the input and output range ,
Equivalence class division ： Divide all possible input data into several subsets , In each subset , If any input data has the same effect on exposing potential errors in the program ,
Equivalence class division ： Divide all possible input data into several self , In each subset &#x