Classification of regression tests

　　 Classification of regression tests

　　 Express the use cases used in regression testing in mathematical form , It can be explained in this way ： Suppose the software function set of a development cycle is P, The corresponding test case set is T.

　　 In regression testing , We can use test case sets T、 For new / modify ( For example, repair defects ) Feature set after P、 To test . among P、⊂P,T、⊂T. So we can see , For regression testing , The key is the set of test cases T、 Selection of .

　　 So how to select regression test case set ?

　　 Commonly used ： Select the regression test case set according to the code modification , Or select regression test case set according to data flow diagram . In short , Collect feature sets that require regression testing P、 Related information , Retrieve the test case set associated with it in the use case library T.

　　 Let's illustrate the whole process of regression testing with an example , Combined with the elaboration of the third part , Two examples are given to illustrate different types of regression tests , How to do regression testing .

　　

　　

　　1. Modified regression test

　　 The modified regression test is mainly used after defects are detected and repaired

　　 hypothesis ： The development cycle D Inside , The software feature set is P={P1,P2,P3,P4,P5}, The corresponding test case set is T={T1,T2,T3,T4,T5}.

　　 After ordinary test , Submit defect set B={B2,B3},B2 yes T2 Use case discovery and P2 Function related defects ,B3 yes T3 Use case discovery and P3 Function related defects .

　　 After defect repair , The function of detecting defects P2,P3 Do regression testing , The regression test case set is T、={T2,T3},T2 and T3 The use case is tested without any modification .

　　2. Progressive regression test

　　 The progressive regression test is usually carried out after adding, deleting and other modifications to the original functions , The progressive flow chart and stage are shown in the figure below 2 Shown , Progressive regression test can be used to start after modifying the original function in the current development cycle .

　　 hypothesis ： The development cycle Dn+1 Inside , The software feature set is P={P1,P2,P3,P4,P5、,P6,P7}, among P1-P4 For the original function of the software ,P6、P7 For the development cycle Dn+1 New functions in ,P5、 For the original P5 Function after modification .

　　 The corresponding test case set is T Contains the original use case set T1-T4, New use case set T6,、7, And the modified test case T5、. namely T={T1,T2,T3,T4,T5、,T6,T7}.

　　 In the progressive regression test stage , Need to be right P5、 Function regression test , The test case used is the original T5 The use case has been modified , To adapt to new P5、 Of T5、 Use cases .

　　3. Understand the significance of regression testing

　　 Regression testing is often mentioned and used in testing activities , There are often testers who don't know the routine ( Ordinary ) The significance of testing and regression testing , And how to conduct regression tests . After the introduction of this paper , It can help testers better understand and regression testing activities .

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