Some latency expectations and data validation may tweak causing side effects with individual tests. The process of testing software during development helps find problems early.

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Semantic rules of API contracts should be validated where your service depends on the behavior. Performing negative tests with equal due diligence makes it easier for testers to identify whether the API deals with receiving invalid or incorrect data gracefully. Instead, you should do away with these dependencies and follow actual user flows.

Create A Mock Api With Jasmine

However, when integrated with some unit testing framework, you can get pretty usable reports in HTML, text or XML formats. When it comes to performance testing, REST Assured does not support performance testing out of the box. If you, however, would like to use it for performance testing, you would have to develop your own custom framework for performance testing around REST Assured.

rest api testing best practices

REST API offers many advantages such as a great deal of flexibility, easy to understand, can handle multiple types of calls, use standard HTTP procedure call, etc. The aforesaid best practices can help you achieve your targets in REST API development, alongside making sure that your solution is easy to use and safe. However, these practices are sometimes challenging to attain also. With the help of an API management platform, you can create successful APIs with less or no knowledge of coding.

An Api Example And A Test Matrix

Knowing the purpose of the API will set a firm foundation for you to well prepare your API testing data for input and output. Following the test matrix above should generate enough test cases to keep us busy for a while and provide good functional coverage of the API. Passing all functional tests implies a good level of maturity for an API, but it is not enough to ensure high quality and reliability of the API. The guidelines above are applicable to any API, but for simplicity, in this post, we assume the most widely used Web API architecture — REST over HTTP.

  • The API testing approach helps to better understand the functionalities, testing techniques, input parameters and the execution of test cases.
  • We are in the world of XP practices and Continuous Development, Continuous review, and Continuous deployment is the way to go.
  • When determining what to test with an API, it’s helpful to understand the different categories of tests.
  • Other tests are like an integration test etc required definite components to be available first before could run them could be risky in relying fully on them especially for CI-CD.
  • We’ve also elaborated on the basics of software quality management.

In order to create a test, one does not have to have any coding skills. However, the GUI does not limit any of the possibilities regarding test planning. If you would still like to add some custom programming/flow, BeanShell component will allow you to do that. Go to folder where you have unpacked the archive, go to bin subfolder, and run jmeter.bat . For more detailed information on how to set up Apache JMeter, see this page. Verifying for the above code if GetBooksAsync method which is a dependency is called once.

What Is A Unit Test

Use fluent setters in your POJOs instead of cryptic endless argument lists. Computer science Don’t depend on the internals of the RESTful service under test .

rest api testing best practices

Remember to include your development and QA teams in this discussion. That way you’ll pick a tool that works for the entire team. And, if those colleagues are already familiar with such tools, they’ll be able to discuss a product’s advantages and limitations. It is far from enough to merely confirm that the endpoint is functional. An API test strategy lays out your goals and the steps to get there.

What Is Unit Testing?

If we look at the response we received in our test, we’ll see SOAP elements such as SOAP Envelope, Header, and Body. For this first API testing tutorial example, we’ll make use of an online app to call our web service.

From the social networking sites, JMeter has an official Twitter account. On Facebook and LinkedIn, there is no official account for JMeter, but there are couple of groups, the larger of which is this Facebook group and this LinkedIn group. JMeter is well known as a performance test tool for testing web apps and services. Out of the box, it has nice reporting options with different chart types that you can use to show the performance test metrics.

The most common API output you need to verify in API testing is the response status code. For example, creating a resource should return 201 CREATED and unpermitted requests should return 403 FORBIDDEN, etc. The test strategy is the high-level description of the test requirements from which a detailed test plan can later be derived, specifying individual test scenarios and test cases. Our first concern is functional testing — ensuring that the API functions correctly.

Types Of Bugs That Api Testing Detects

This can be a detailed formal document, or a checklist such as below. Choose an API api testing best practices testing answer with Selenium-based web UI testing and a native visual editor.

rest api testing best practices

The mocked method is the dependency that is avoided intentionally to concentrate only on the unit of work in isolation. The below example has response is cast to actual type i.e Book to very the schema of returned responses.

This post will feature some best practices for everybody involved in API testing. The third and final post will contain some useful code example for those of you looking to build your own automated API testing framework. Whatever you do, don’t skip the error messaging or failure tests. It’s important to know how an API responds to bad data and about any other problem within the application and its API set.

The term API stands for Application Programming Interface. It acts as a mediator that helps applications to communicate with one another. Execute the test that uses/relies on the prepared components, and verifies/asserts that the outcome matches the expected result. An application functions across all platforms, including desktop, web or mobile. All test cases should be labelled appropriately and tagged to their original requirements. Not only is API adoption growing by an order of magnitude, but so is the variety of API technologies used.

Create Less Flaky Automation Tests Quality Content Every Week, Right In Your Inbox

Like any other kind of testing, the choice of tool or automation framework used has a substantial impact on the effectiveness and success of your testing efforts. Using a solid API test automation tool brings a wide range of benefits to the testing process, including higher accuracy, reusability, and scalability of tests. For all subsequent requests to the API, the session ID is checked and if valid, the use request is processes. Upon logging out, the session is destroyed on both the server-side and client-side. These are just some of the basic elements included in an API test suite.