first，We need to understand，What is software testing，The purpose of software testing is to ensure the quality of software、Make sure the software does what you expect in the right way，So software testing is mainly to find software errors、Effective definition and implementation of software component assembly process from low level to high level、Verify whether the software meets the technical requirements specified in the specification and system definition document、It provides the basis for the establishment of software quality model。

And software testing is not only to ensure the quality of software，Also provide information to developers，In order to facilitate the preparation of risk assessment，It is important that he runs through the whole process of software development，Ensure that the whole software development process is of high quality。Software testing is indispensable in the whole process of software development，If we can find the defect of Patriot missile defense system early, there will be no 28 soul elegy；If we can play the role of software testing as soon as possible，It was these small mistakes that caused a huge response，So we have to pay attention to software testing，Correctly realize that software testing is crucial and decisive in the whole process of software development，Maybe it's just the simplest input error that destroyed decades of hard work。

When is the best time to start testing

Emphasize in software lifecycle，Software testing is after software design and program coding，It is most appropriate to do this before the software runs。But in my opinion，Considering that testers are looking for bugs in the software development process、Avoiding defects in software development、Focus on the needs of users and other tasks，So as a software developer，Software testing should be embedded in the whole process of software development，For example, in the software design and program coding stage, we have to embed the software testing part，Always check the feasibility of the software，But as a professional software testing work，Or after coding，Before running the software is most appropriate。