API Testing And How to Do It

A UI test for our e-commerce app could verify that users can access the homepage and, within a certain amount of time, click on a link to view a product. If you look at the code above, we’re not testing the PriceCalculator behavior with respect to other services in the application. Nor are we testing the entire module; we’re testing a unit of work independent of other modules. Isn’t it okay just to test the module and leave the unit of work? The nastiest bug I’ve seen in production as an engineer happened at the unit level. If your code suffers defects at the unit level, it’ll propagate to your entire application.

API testing automation even allows you to test in tandem with development. It’s important to understand what API testing is and how to conduct it in order to stay connected in this digital economy and release products faster. For example, if you’re testing an HTTP API, then you can review the OpenAPI specification, which defines a standard, programming language-agnostic interface description for HTTP APIs. This specification details all the HTTP API’s objects, values, and parameters, how the objects are called, what each object does, and how they can be used together.

How is REST API testing performed

API load tests should be used to test the stress on the system. When testing the API, note what happens consistently and what does not. Use both manual and automated tests to produce better, more trustworthy results.

If possible, the tools should provide a way to convert the request and responses into software “objects” that make dealing with the data easier. A Web Service is a unit of managed code that can be remotely invoked using HTTP, that is, it can be activated using HTTP requests. Web Services allows you to expose the functionality of your existing code over the network.

What is REST API Testing?

Each verification method has pros and cons, and there is no one-size-fits-all option. You need to choose the solution that best fits your testing project. For example, the output of the “Create user” API will be the input of the “Get user” API for verification. The output of the “Get user” API can be used as the input of the “Update user” API, and so on.

Currently, the market offers a variety of tools, but it is necessary to choose the one that best suits the scenario of your project. While the use cases of API testing are endless, here are two examples of tests that can be performed to guarantee that the API is producing the appropriate results. An open source application that helps with UI automated testing. SoapUI. The tool focuses on testing API functionality in SOAP and REST APIs and web services. API tests use extreme conditions and inputs when analyzing applications.

Best API Testing Tools for Building Functional, Secure Applications in 2022

UI tests can’t cover every aspect of back-end testing and turn out to be insufficient for verifying functional paths and API services. This could leave you with bugs rooted in the server or even at the unit level. But now, the cost of mistakes is way higher as it may require rewriting a considerable amount of code and derail the release. Client, server, and database are the three independent tiers of software architecture. Usually, a client is a web browser or a mobile application that presents the requested info, while business logic is realized on the server side. Client and server communicate through requests based on different transfer protocols.

How is REST API testing performed

This removes vulnerabilities and guards the app from malicious code and breakage. API test automation requires less code than automated GUI tests, resulting in faster testing and a lower overall cost. The test should also analyze the results of nonfunctional tests as well, including performance and security. API testing is frequently automated and used by DevOps, quality assurance and development teams for continuous testing practices. REST is a software architecture style, commonly used for web services. Due to its popularity, you will probably need to load test RESTful APIs at some point.

What You Need To Start API Testing

When performing an API test, developers can either write their own framework or choose from a variety of ready-to-use API testing tools. Designing an API test framework enbles developers to customize the test; they are not limited to the capabilities of a specific tool and its plugins. Testers can add whichever library they consider appropriate for their chosen coding platform, build unique and convenient reporting standards and incorporate complicated logic into the tests. However, testers need sophisticated coding skills if they choose to design their own framework. API testing is also integral to Agile software development, in which instant feedback is necessary to the process flow. In Agile environments, unit tests and API tests are preferred over graphical user interface tests because they are easy to maintain and more efficient.

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In this post, we’ll focus on the test pyramid—the three layers of tests you should have in your test suite and how to write them. To load test the same API, increase the number of threads in the thread group and add a Table results listener to measure the response time and success rate of the API. Curl– A command line tool for transferring data with URL syntax to or from a server using supported protocols like HTTP, HTTPS, IMAP, LDAP, POP3, RTMP, SCP, SMB, SMTP etc. Hit the API with multiple simultaneous requests to the server to verify the load handling capability of the API.

Unit Test

For small applications, it is recommended to use a standard test environment. When there are many internal states, it is best to set up a separate test environment by copying all resources to a temporary environment or using tools such as WireMock to simulate them. Automated API testing avoids human error and drudgery and is therefore far superior to manual testing. To prevent bugs early in the software development lifecycle, we recommend incorporating automated API testing into your continuous integration testing pipelines.

How is REST API testing performed

For more information about HTTP status codes, along with a comprehensive list of all the different codes and error messages, read our HTTP Status Codes List article on our Knowledge Base. More to this, when you open Google maps and look for a specific place you want to visit, you can also see the nearby amenities, such as restaurants and commute options. That happens because the companies have exposed their APIs, and REST API works almost in a similar way. You prefer to request some data using HTTP , and you receive information or results from the companies you are requesting from.

To get started with API testing, download ReadyAPI

Your first functional test of a REST service with SoapUI, just a couple of clicks away. Open the REST Request test step and clickto send the request. SoapUI creates the project complete with a Service, Resource, Method and the actual Request and opens the Request editor. Sending a GET request to /pet/ would retrieve api testing best practices pets with a specified ID from the database. Creativity testing — the API can handle being used in different ways. API testing is one of the most challenging parts of the chain of software and QA testing because it works to assure that our digital lives run in an increasingly seamless and efficient manner.

  • Since APIs lack a GUI, API testing is performed at the message layer.
  • REST is very data-driven, compared to SOAP, which is strongly function-driven.
  • This tool enables loading web servers, websites and web apps by simulating real-world behaviours and testing environments.
  • And try out countless different parameter settings in hopes of identifying a request that breaks something.

This implies the social media app has an existing agreement with Google and Facebook to access some level of user information already supplied to these two sources. Parameter combination can be challenging because every combination must be tested to see if it holds problems related to specific configurations. Call sequencing is also a challenge because every call must appear in a specific order to ensure the system works correctly. This quickly becomes a challenge, especially when dealing with multithreaded applications.

Types of REST API Tests

Service virtualization is used in conjunction with API testing to isolate the services under test as well as expand test environment access by simulating APIs/services that are not accessible for testing. I have been a black box tester for the major part of my career. Though being quite good at it, I never really got a chance to do a lot of technical work, like backend testing. Most of my offshoring projects just did not have scope for that.

However, these tasks should come after all APIs have been individually tested. An API is essentially the “middle man” of the layers and systems within an application or software. Web Testing Robust solution for end-to-end web automated testing. As mentioned above, we have Newman that runs your Postman collections by command line; this is very useful when you want to leave your tests as a step in your build. To use it, just export the collection and the desired environment from Postman. To generate collections of test requests on Postman, we can import a Swagger document or generate a new collection through the tool itself.

Unlike SOAP-based Web services, there is no official standard for RESTful Web APIs. After running, it will display the results with the tests performed and show which test passed and which failed. It will start all programmed requests in your collection, and inform you which tests have passed or failed. In case of errors, validating the status is in accordance with the error codes. The job a product manager does for a company is quite different from the role of product owner on a Scrum team.

The following tutorial is for REST API automation testing using Postman. Postman is a popular API client that allows developers and teams to test, share, create, collaborate, and document the API development process. The client is ideal to create and save the complex, as well as simple HTTP/s requests along with their responses.

The Requests library saves time and effort by fully automating keep-alive and HTTP connection pooling. No need to manually add query strings to URLs and form-encode POST data. Igor Pavlenko considers Requests a powerful library with easy-to-understand documentation, simple syntax, and rich functionality. Taking security testing a step further, in penetration testing, certain API functions, resources, processes, or the entire API is under attack from the outside. This determines whether the threat vector can be reached. You want to be sure that your system performance scales according to the changing load.

Security testing is often grouped with penetration testing and fuzz testing in the greater security auditing process. Security testing incorporates aspects of both penetration and fuzz testing, but also attempts https://globalcloudteam.com/ to validate the encryption methods the API uses as well as the access control design. Security testing includes the validation of authorization checks for resource access and user rights management.

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