Software test interview question: please introduce the meaning of various test types in detail?

Please describe in detail the meaning of various test types ?

　1- unit testing ( Module test ) It's a small piece of code written by developers , A small tool for verifying the code under test 、 It's very clear whether the function is correct . generally , A unit test is used to determine a specific condition ( Or the scene ) The behavior of a particular function . Unit testing is done by the programmer himself , It's also the programmers themselves who benefit in the end . You can say that , It's the programmer's responsibility to write functional code , At the same time, you have the responsibility to write unit tests for your own code . Perform unit tests , Just to prove that the behavior of this code is consistent with what we expect .

　2- Integration testing ( It's also called assembly testing 、 The joint test ) It's a logical extension of unit testing . Its simplest form is ： Two tested units are combined into one component , And test the interface between them . From this level , Component refers to the integration and aggregation of multiple units . In the real plan , Many units are combined into components , And these components make up a larger part of the program . The way to do this is to test the combination of fragments , And eventually extend the process , Test your module with modules from other groups . Last , Test all the modules that make up the process .

3- System testing is to assemble the tested subsystem into a complete system to test . It is an effective method to check whether the system can really provide the functions specified in the system scheme specification .( Common joint debugging test ). The purpose of system testing is to test the final software system comprehensively , Ensure that the final software system meets the product requirements and follows the system design .

　4- Acceptance testing is the last test operation before deploying the software . The purpose of acceptance testing is to ensure that the software is ready , And users can perform the established functions and tasks of the software . Acceptance testing is to show future users that the system can work like reservation requirements . After integration testing , All the modules have been assembled into a complete software system according to the design , Interface errors have been basically eliminated , Then we should further verify the effectiveness of the software , This is the task of acceptance testing , That is, the function and performance of the software are as expected by users .

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