The concept of interface testing and the use of postman tools

API（Application Programming Interface, Application programming interface ） Are some predefined functions , The purpose is to provide the ability for applications and developers to access a set of routines based on certain software or hardware , Without access to the source code , Or understand the details of the internal working mechanism .

What is interface testing ？

Interface test is to test the interface between systems or components , Mainly the exchange of verification data , Transfer and control the management process , And logical interdependence , The interface protocol is divided into HTTP,WebService,Dubbo,Thrift,Socket Other types .
Why do interface tests ？
The interface test is implemented under the multi system platform architecture , It has an extremely efficient cost-benefit ratio （ Of course , Unit testing is more profitable , But the cost of implementing unit testing is greater , Higher technical requirements ）.
Interface testing naturally brings efficient defect detection and quality supervision capabilities to highly complex platforms , Complex platform , The bigger the system , The more effective the interface test is .
The advantages of interface testing are mainly reflected in the following three aspects ：
1. Save testing costs .
Calculate according to the data model , A program at the bottom BUG May trigger UI Layer of 8 about BUG, And at the bottom BUG It is more likely to cause the crash of the whole network ; Interface testing can provide low-cost and efficient solutions when the system complexity increases .
2. The door bar of interface test is relatively low
Interface testing is different from unit testing , Interface test is a comprehensive, efficient and continuous test of system interface from the perspective of users .
3. More efficient
Implement interface testing as automation and continuous integration , When the complexity and volume of the system are larger , The lower the cost of interface testing , Corresponding , The higher the benefit output .
How to do interface testing ？
The basic interface function automation test process is as follows ：
Demand analysis -> Use case design -> Script development -> The test execution -> Result analysis
Demand analysis
Requirement analysis is a reference requirement 、 Design and other documents , On the basis of understanding the requirements, we also need to know the internal implementation logic , And you can put forward requirements at this stage , Unreasonable or omission in the design .
Use case design
Use case design is based on understanding interface test requirements , Use Excle or XMind Such as mind mapping software to write test case design , The main contents include parameter verification 、 Business scenario verification 、 Safety and performance verification, etc , The commonly used design methods are equivalent class division 、 Boundary value analysis 、 Scenario analysis , Cause and effect diagram 、 Orthogonal table, etc .
Script development
Use your familiar language or tools to develop .
The test execution
You can run the interface test script directly or use CI To perform tests .
Result analysis
Analyze the interface test results according to the test report .

---

Postman Introduction and use

---

postman It is a web page mode and sending web page Http request , And run Google plug-ins for test cases .
The main functions include ：
Simulate all kinds of HTTP request