How much does software testing help reduce program bugs?

Software testing is important for reducing program BUG How helpful ？

Experienced programmers often think that testing is as important as code , Testing can reduce the uncertainty of code changes or extensions . The test should be easy to read, simple and run quickly , It doesn't use much memory .

Common software errors may cause the program to terminate suddenly and even damage the database , The consequences can be very disastrous ：1996 year , Ariana... Due to a software error -5 The launch vehicle exploded . This error is caused by the conversion of floating-point numbers to integers , This is a 16 Bit signed integers can only represent small integer values . The integer cannot represent a floating-point number, and the program stopped when it detected this unexpected error .

The function that triggers this error is not required , It is only integrated from the early Ariana rocket model as a subsystem . according to 1996 Price calculation for the year , The cost of this error is about 4 Billion dollars . The importance of producing the right software has long been well known .

There are several common strategies that excellent scientists and engineers have been trying to ensure correctness for decades . for example , To do a complex scientific calculation , Then we need to set up several independent teams to calculate the answer .

If all teams get the same answer , It can be concluded that the answer is correct . This redundancy strategy is usually used to prevent hardware related failures . unfortunately , Writing multiple versions of software is often impractical . Many programmers want to prove that a program is correct , Regardless of hardware failures, you must ensure that the software does not encounter any errors . In fact, today's software is very mature, which can prove that the program is correct .

Programmers have come to understand the need to test software , But not all code needs to be tested , Typically, prototypes or examples do not require further validation . but Any design done in a professional environment 、 The important functions that must be implemented should be tested at least partially . Testing can reduce the likelihood of having to face disaster situations in the future .

There are two common tests , Unit test and integration test .

Unit testing is designed to test specific components of software programs . for example , Unit testing for a single function . in the majority of cases , Unit tests are done automatically , The programmer simply presses a button or enters a command , These tests can be performed . Unit testing often avoids acquiring valuable resources , For example, create large files on disk or establish a network connection . Unit tests usually do not involve the setup of the operating system .

Integration testing is designed to validate a complete application . Usually these tests require access to the network , Sometimes you need to access a lot of data . Integration testing sometimes requires human intervention , It also requires application specific knowledge . Integration testing may require setting up the operating system and installing software . Integration testing can also be automated , At least partially automated . Most of the time , Integration testing is based on unit testing .

Unit tests are often used as part of continuous integration . Continuous integration often automates specific tasks , Including unit tests 、 Backup 、 Application encryption signature, etc . Continuous integration can be performed periodically or when code changes .

Unit testing can be used to establish software development process and guide software development . Before writing the code itself , You can write these tests first , That's what they say “ Test-driven development ”. Usually , The test is written after the function development is completed . Writing unit tests and developing functions can be done by different programmers . Sometimes , Tests provided by other developers are more likely to find errors , Because they may make different assumptions .

Experienced programmers often think that testing is as important as code . So it's not uncommon to spend half your time writing tests . Although it will affect the speed of writing code , But in the long run , Testing is an investment , So it usually saves time . It is often more difficult to update software that has not been well tested . Testing can reduce the uncertainty of code changes or extensions .

The test should be easy to read , Simple and fast , And it doesn't use much memory . However , It is difficult to accurately define the quality of the test . There are several common statistical methods . for example , You can calculate the number of lines of code covered by the test . here , I have to talk about test coverage .100% Coverage means that all code has been tested . However, in practice, coverage can not well represent the quality of testing .

All computer systems are flawed . The hardware may fail at any time . Even if the hardware is reliable , It is also almost impossible for programmers to predict all the situations encountered in the operation of software . No matter who you are , And no matter how hard you work , Your software won't be perfect . Nevertheless, you should try your best to write the right code ： Can meet the expectations of users .

Although you can write the correct code without writing tests , But the benefits of the test suite are tangible in difficult or large-scale projects . Many experienced programmers refuse to use untested software components . The good habit of writing tests can help you grow into a better programmer . In the process of writing tests, you will further realize the limitations of human beings . When interacting with other programmers and users , If you have a test suite, you can better think about their feedback .

If you want to learn by yourself, you might as well take a look at this video of learning roadmap , See if you're fit for a career ~

Software testing learning roadmap details

The first stage A functional test

Pre school guidance ： Learn the content of this stage , The whole process function test solution 、Web Automated testing solutions 、 Data separation solution 、 Automated test reporting solutions 、 Log collection solution .

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2. From beginning to mastery of software testing

Software testing is a process of auditing or comparing the actual output with the expected output . The classic definition of software testing is ： Operate the program under specified conditions , To find program errors , Measuring software quality , And to evaluate whether it can meet the design requirements . This course consists of 5 God , Record for zero basic white . A necessary course for the introduction of zero Foundation .

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3. Linux System 2 Get started

This video contains Linux Operating system introduction 、Linux Common commands 、vi Editor . Learn and master the contents of this stage , Can have Linux Project construction capacity .

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4. software test MySQL Database knowledge intensive + Project practice

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The second stage Python Programming

Pre school guidance ： Learn the content of this stage , Can grasp Python grammar , Ability to program ; Be able to establish programming thinking and object-oriented programming thinking ; Can master UnitTest Framework management test cases .

10 Heaven plays Python software test

Learn the content of this stage , Can grasp Python grammar , Ability to program ; Be able to establish programming thinking and object-oriented programming thinking ; Can master UnitTest Framework management test cases .

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The third stage UI automation

Pre school guidance ：ui Automation is generally divided into web Automation and App automation , It accounts for a large proportion in the field of automated testing , Regular use .

1. software test web Automated test elaboration and actual combat

This course will teach you to build Web Automated and mobile automated test environments ; master Web Automated test process and scripting ; Master the positioning method of elements in mobile automation testing 、 Element operation and gesture operation ; Have a good command of ADB Tool use ; master PO The design idea of pattern , And can encapsulate the page ; Master the implementation of data-driven ; Be able to flexibly use automation related technologies in practical projects .

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2. Zero foundation entry mobile automation ——Appium frame

This course will explain in detail Appium frame ,Appium It's an open source 、 Cross platform automated testing framework , The framework applies to Native Application、Mobile Web Application or Hybrid Application Automated testing .

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3. Easily teach you to use Appium Conduct IOS Real machine automated testing

This course , Present the steps and precautions of environmental installation to the trainees , Simulator to real machine practice , They all demonstrate and explain . rich content , Vivid image , After learning, you can complete IOS Actual operation environment .

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The fourth stage Interface automation

Pre school guidance ： Interface testing is the most frequently used part of all automated testing applications . This stage is divided into 14 Three parts will be explained in detail .

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This tutorial will cover HTTP,Postman,Pymysql,requests library , Integrate UnitTes,Dubbo And so on , At last, the project practice of this stage is carried out with the intelligent health project .

4 Day play interface test , Interface focus full analysis + The actual combat of Chuanzhi health project （ contain requests library , Integrate UnitTes,Dubbo And so on ）

The fifth stage Performance testing

Pre school guidance ： Performance testing belongs to the category of advanced testing , It's very helpful for salary promotion , This video explains how to build a performance test environment ,JMeter Tool use , Performance test monitoring 、 Analysis and tuning methods .

4 Day quick start performance test

This video passes the performance test, basic theory and JMeter Learning tools ; Through the actual combat of the light mall project , Take the students to master the performance test demand analysis 、 Performance test plan 、 Test case design 、 Test script development 、 Performance monitoring 、 Performance analysis and tuning 、 Performance test report summary .

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Phase 6 Comprehensive projects strengthen

Pre school guidance ： Through wechat applet 、 The financial project is a comprehensive and enhanced functional test of two practical projects 、 The interface test 、 Performance testing .

1. Wechat applet automatic test practice

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2. software test 4 Finish the financial project in days

This video explains the function test solution of financial project 、 Real project test experience solution 、 Complex business interface test solution Interface encryption and decryption test solution 、 Data separation solution Continuous integration solutions 、 Automated test reporting solutions 、 High concurrency test solution .

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