API Testing and Automation with TestOnNeed
Application Programmable Interface (API) enables communication and data exchange between two software systems. The software system may be an independent application in a monolithic architecture. For example – Integrating messaging application in another e-commerce application via API.
The software system may be a microservice that communicate and data exchange with another microservice within an application in a microservices based architecture. For example – Integrating multiple software systems or microservices such as billing and ordering via API to build an e-commerce application. Please note once the same e-commerce application can also have another microservice in it that supports API to interact with or to integrate with any 3rd party application such as messaging application.
An application at its abstract level made up of three essential software systems or microservices that ideally should be able to work and communicate in a segmented way. So, reusability and portability of microservices to another application or swapping within the application is possible.
Data software system: The microservice that stores, retrieves and updates data from storage such as database and file systems. This layer may be made of API so that other microservices can perform data operations.
Business logic software system: The microservice that is responsible for making the decision, processing data, processing commands and more. It is the brain of the application that implements the complete workflow and logic of the application. This layer is made of the API.
Presentation software system: The user interface microservice which is the top layer of the application, which translates tasks into something the user understands and see it via the graphical user interface.
The business logic software system is the brain of an application. In other words, the API is the brain of our connected world that allows everything to work together in a streamlined and integrated way. Therefore, API testing is testing that API and the integration they enable work in the most optimal way. Not thoroughly testing API means it only break a single application but a chain of business processes hinged to it.
API testing is entirely different from GUI testing. API testing mainly concentrates on the business logic layer of the software application while GUI testing focuses on the look and feel. Though GUI testing test the business logic layer functionalities indirectly, it is not enough. Testing application via API to cover tests from all aspects including characterizing the capacity and performance on a massive scale is a must. Remember, not only through GUI the business logic is invoked but also through various third-party applications and internal microservices. So, in order to ensure the best quality and performance of an application, API testing must be done considering all aspects of integration and communication.
API testing is sophisticated and is one of the most challenging parts of the whole chain of software and QA testing. There are many variabilities that one must consider while developing test cases such as parameter combination, parameter selection, call sequencing, return value based on input conditions and trigger some other API/event/interrupt. The tester must understand the functionality of the API program and clearly define the scope of the program. Then, apply relevant testing techniques such as equivalence classes, boundary value analysis, and error guessing and write test cases for the API. Importantly, coding knowledge is necessary for testers. Though some commercial tools try to avoid coding through the different mechanism, it may not cover all test possibilities.
Conclusion: API enables integration and communication. If API is not tested properly, it may cause problems not only in one application or microservices but also in the calling application or microservices and eventually the whole business.
TestOnNeed is an on-need QA test, automation, and DevOps expert trusted by industry-leading companies. We work with partners to create flawless, high quality, high-performance software application products. We enable continuous API testing of an application or microservices throughout product development lifecycles such as discovery testing, usability testing, reliability testing, security testing, load testing, Documentation testing and more.
Developers, Testers, and Managers – Do you want to know more how to test API?
Learn how we do it at https://bit.ly/2NRBLRT and https://bit.ly/2OmumuV
To learn more, visit us today at https://testonneed.com/.
Being efficient and fast is all about transformation and success is all about welcoming it. Start your project today at https://testonneed.com/starttest/.