Software Testing Interview Questions: What is Software Testing?The purpose and principle of software testing?

What is software testing?The purpose and principle of software testing?

The process of running or testing a system using manual or automatic means.Its purpose is to test whether it meets specified requirements or to clarify the difference between expected and actual results.

Purpose:

 Testing is the execution of the program, the purpose of which is to find errors;A successful test case lies in finding bugs that have not been found so far;A successful test is one that finds a hitherto undiscovered bug;Make sure that the product does what it promises or announces, and that the features that users can access are clearly documented;Ensure that products meet performance and efficiency requirements;Ensuring that the product is robust and adaptable to the user's environment;

Principles of software testing:

Software testing should be performed as early as possible and throughout the software life cycleSoftware testing should trace requirementsTests should be constructed by a third partyExhaustive testing is impossible, follow the Good-enough principleThe expected output (or result) must be determinedEvery test result must be checked thoroughlyPay full attention to the clustering phenomenon in the testThe 28 Theorem of DefectsStrictly implement the test plan and eliminate the randomness of the testPay attention to legitimate and reasonable input, and also pay attention to illegal and unexpected inputCheck if the program does what it shouldn'tTesting should start at "small scale" and gradually move to "large scale"Repeated use of the same tests makes software resistantFocus on bug fixes

Programmers should avoid checking their own programs, and testing should be done by an independent professional software testing organization.

When designing test cases, legal input and illegal input should be considered, as well as various boundary conditions. In special cases, extreme states and unexpected states should be created, such as abnormal network interruption, power failure, etc.

Be sure to pay attention to the phenomenon of concentrated errors in testing, which has a lot to do with the programming level and habits of programmers.

There must be a confirmation process for test error results.Generally, there are errors tested by A, and there must be a B to confirm. For serious errors, a review meeting can be held for discussion and analysis.

  Develop a strict testing plan and arrange the testing time as loosely as possible. Don't expect to complete a high-level test in a very short period of time.

The relevance of regression testing must be fully paid attention to. It is not uncommon for more errors to appear when one bug is fixed.

Properly keep all test process documents, the significance is self-evident, the reproducibility of the test often depends on the test documents

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