Overview of Interface Testing and Its Various Type

Posted By Pratyush Kumar Singh | 25-Nov-2018

Introduction: For a system, an interface is often APIs, web services etc. The communication between the various elements of a software or an application or a website will have an effect on the general performance thus the interface must be tested and verified.

The testing that is done to verify the interface functionality is termed Interface testing.

The 2 common elements of Interface testing include:

  • Web server and application server interface.

  • Database server and application server interface.

When and Why Should we Test an Interface?


Mentioned below are the three phases of Interface testing in an Interface lifecycle:

1) Configuration and development: When the interface is designed, and once the development starts, the configurations ought to be verified as per the necessity.


2) Validation: When the development is completed, the interface must be validated and verified, this will be done as a section of unit testing.


3) Maintenance: Once the complete software is ready, deployed and working, then the interface must be monitored for its performance and any new problems introduced because of the changes made or deteriorating performance.


Once we are glad about the interface, we validate it for the supposed workflow, data etc. we will run performance, huge data tests and check how well the interface responds. this can save plenty of time which will be spent on fixing the defects later.


In a nutshell, Interface testing is done:

  • To check if the server execution is correct.

  • To check if error handling is done properly, and error messages are shown properly.

  • To check the result once a connection to the server is reset.

  • To check the safety aspect once the components communicate among themselves.

  • To check the impact of network failure on the communication between the elements.

Types of Interface Testing

Interface testing is essentially done on the messaging layer of the system design. It principally involves testing the rest API or SOAP web service with JSON or XML format.

Interface testing usually involves the following practices:


Unit Testing: Testing the functionality of every individual operation (in a function).

Functional Testing: Testing the functionality of huge scenarios involving test case creation, validation, regression etc.

Load Testing: Validating the performance underneath load, principally by using purposeful test cases.

Security Testing: Testing the security mechanism and it includes penetration testing as well as validating access management, encoding etc.

Runtime Error Detection: Monitoring an application for issues like runtime race, resource leak, etc.

Workflow Testing: This is often done to make sure if the interface engine handles your workflow for sure.

Individual Systems: This testing is done to verify the individuality of every system. like the billing system and inventory management system ought to be able to operate individually.

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