![]() ![]() XML and JSON are typically structured data so the verification is fast and stable. Language independent: Data is exchanged via XML and JSON, so any language can be used for automation, independent from the languages used to develop the application. ![]() ![]() It offers a number of advantages over other kinds of testing: It also offers a number of advantages over other kinds of testing: Advantages of API testing Īs discussed above, API testing is an important activity that testing teams should focus on. Due to the fact that automated functional UI testing is brittle, and any changes in the UI can break the tests, test automation teams should focus less on this level of testing.ĪPI testing yields the highest ROI compared to all other testing type performed by testers as Unit test performed by developers mostly. Workflow Tests (through the UI): functional UI testing is performed via the UI of the application to ensure that its features are built as expected. Testing at this level may need about 20% of the total testing effort. So API testing is performed to ensure the accuracy of API/services. In Web and mobile applications, data shown in the user interface is often returned from servers via API/services. The tests are designed to test against user stories to ensure that all implemented functions are working as expected. The unit/component tests can attain between 70% and 80% of code coverage and require as much effort.īusiness rules/Functional tests: This level of testing focuses on business rules of the application under test. Unit/component tests: This lowest level of testing brings the highest value and ROI. As such, API and services tests in the second layer is an important testing activity that we should focus on. Despite its being overly simplistic, it offers us a general rule of thumb: it suggests how much testing we should focus on at each layer. It has layers representing different types of testing. The figure below shows three different layers of testing called the test pyramid initially coined by Mike Cohn in his book Succeeding with Agile. Where is API testing performed? Ĭommonly, applications have three separate layers or tiers including Presentation Layer or user interface, Business Layer or application user interface for business logic processing, and Database Layer for modeling and manipulating data.ĪPI Testing is performed at the most critical layer, the Business Layer, where business logic processing is carried out, and all transactions between User Interface and Database happen. API testing also requires less maintenance effort compare to UI automation testing which makes it a preferred choice for Agile and DevOps teams.Ī side note, for Web and mobile applications, API often means Web services, and API testing refers to the automation test performed to the Web services. Since APIs lack a GUI, API testing is performed at the message layer and can validate application logic very quickly and effectively.ĪPI testing is critical for automation testing and CI/CD process because it can cope with short release cycles and frequent changes especially the presentation layer without breaking the test outputs. What is API testing? ĪPI testing is a type of software testing that involves testing application programming interfaces (APIs) directly and as part of integration testing to determine if they meet expectations for functionality, reliability, performance, and security. You will also find potential challenges with API test implementation – best practices and how to choose right toolset to help you achieve API testing with a higher success chance. This article aims to provide an overview of API testing with candid answers to the What – When – Why- questions that hopefully shed light on this mysterious land hidden inside the boundary of testing – engineering realm. Introduction to API testing in Katalon Studio
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