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API testing deals with testing the business logic of an application, which is typically encompassed in the business layer and is instrumental in handling all the transactions between the user interface and underlying data. It is deemed as a part of Integration testing that involves verification of functionality, performance, and robustness of APIs.
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The Value of Mixing UI and API Testing • Implementing API testing without UI testing or vice versa is like having a pizza without cheese. Though many organizations are likely testing both layers, there are teams that are focusing on just one or the other or don’t have a framework in place in order to test both effectively. • This article discusses the importance of testing at the API and UI level and how having a single framework for both helps speed up the development cycles.
Importance of Testing at API layer The use of API-driven architectures and even more so now with microservices has opened businesses to a hidden layer of risk. In fact, some of the most significant vulnerabilities are hidden in the non-human interface of the API. It comes with an added benefit that you can test the business logic of the application without the need of the UI, in a stable way.
Importance of Testing at the UI layer • UI is the first impression of the application. Testing at the UI layer involves testing the application while considering: • Usability • Errors • Look and feel • It is important to test the UI in all aspects as ultimately it all depends on the end-user or the client whether the application will pass or fail. No matter how good you are at coding or database, the moment a user can’t complete a request through the UI, it’s all a waste.