What is your understanding of interface testing?

1） Why test interfaces ？
When developing software, we usually develop the back end first , After the back-end development is completed, integration testing is required . Interface testing is to bypass the front end , Direct call to interface , Test whether the interface function is normal . Interface tests usually require input parameters , The test result will have a return value , The return value is called the response data .1, Early test intervention can save the time of front and rear end joint commissioning . 2. An interface problem may show multiple problems on the interface , Reduce the later function test time and bug.
2） When to do interface testing ？
1, When we testers get the interface document , You can start writing test cases , The test must be carried out before the joint commissioning .
2, The back-end interface is developed , You need to do interface testing .
3） What is the interface ？
The interface between software is the channel for data transmission , It may be the interface of a system or a function .
4） How interfaces are classified ？
Interface is divided into internal interface and external interface . Internal interface ： Parameter transfer interface between systems . External interface ： Functional interfaces involving third parties , Across the interface of the system , For example, payment 、 WeChat validation 、 Interface for mobile phone verification .