API Testing Process Using REST Assured and PostMan Tool

If we have 400 UI tests then they may take around 40 hours to run whereas 400 API tests could be run in 3 minutes. That implicates that you’ll find more bugs in less time, while also being about to fix them immediately. In this testing, the APIs and the integrations they enable are tested. API testing is critical to ensure that our digital life runs in an increasingly seamless and efficient manner. Continuous testing is also very important to ensure that everything continues to work exactly as it should.

Here, resources are created on the server and hence, the changes are done to the server. This is done to test the API at its absolute limits, and serves somewhat as a «worst case scenario». Web UI testing – Performed as part of end-to-end integration tests that also cover APIs, enables teams to validate GUI items in the context of the larger transaction. Now, let’s test one API repository class with this unit test.

They are basically a collection of functions and procedures which allows us to communicate two applications or libraries. This guide is for any Software Tester or Test Automation engineer who is looking to learn What is API testing How it is done at enterprise level using CI/CD. Here, resources are updated on the server and hence, the changes are done to the server. Here, no changes are made to the server or to already existing resources. Like we get a lot of advantages by using APIs in application, similarly by performing API testing we achieve a lot of things towards the success of the developed application. Unit testing – Testing the functionality of individual operations.

Disadvantages Of Restful Web Services

Security token uses the authentication protocols and an X.509 certificate to define the relationship between the public key and identity key. The signatures are used to verify the messages and their origin, generate knowledge to confirm the security tokens to bind the identity of a person to the identity of the originator. Security model prevents different attacks and can be used to protect the SOAP architecture.

We send the request and record the response for further assertions. This way we can check if the REST API is working fine or not. REST API testing is mainly done using four REST https://globalcloudteam.com/ methods, viz, GET, POST, PUT, DELETE. REST architecture treats any content as resource, which can be text files, HTML pages, images, videos or dynamic business information.

API testing overview

POST operation responses are not cacheable, but PUT operation responses are idempotent, thus you can cache the response. If you retry the request N times, the server will create N resources with N different URIs. To find out what could be wrong, we need to get access to the customer environment and enable debug logs both at the client as well as server ends. In cloud based applications where RESTful web services become just a part of the application, we can use a SaaS based solution such as Loggly for log management. This would mean easier debugging for cluster-based deployments.

In this article, we saw the common issues found and how to tackle them at production followed by best practices to minimize issues. This is recommended because if performance issues go unnoticed and find their way into the customer environment, it could tarnish the reputation of the software. Moreover, getting api testing best practices access to the production site and debugging the performance would be a time consuming and tedious task as multiple levels of support is required in a real world scenario. Hence most API development teams prefer using bench-marking tools to evaluate performance of the application before their release.

Postman sends an API request to the webserver and receives the response. As one of the leading QA companies, we have been doing our manual Rest API testing using Postman whenever it was deemed necessary. API testing involves testing APIs directly and as part of the end-to-end transactions exercised during integration testing. Beyond RESTful APIs, these transactions include multiple types of endpoints such as web services, ESBs, databases, mainframes, web UIs, and ERPs.

This means users will encounter error messages when they are navigating through the APIs. Errors at the client or browser level mostly result in 4xx status code error messages. Whereas server-level errors result in 5xx status code error messages. So when performing REST API testing we should evaluate each response by inspecting the error codes. You can use status codes to understand the outcomes of your requests.

.Net Interview

When a system has a collection of APIs, these needs to be tested to know that the system is working perfectly or not. Mostly we can say that API testing confirms system’s performance, reliability, security and functionality. The developers usually test the basic functionality while testers perform QA of functionality, performance, and security of APIs. With the exception of the terms of the output they produce, PUT and POST operations are relatively similar.

In fact, RESTful web services have become the de facto method for integrating applications. Many social media networks, enterprise software and services expose REST Interfaces so that third party applications can code against them to integrate with. All API response status codes are separated into five classes in a global standard. The first digit of the status code defines the class of response.

APIs encompass all the functions that characterize the business logic layer. API testing is a form of integration testing that is performed to test the API to validate its functionality, reliability, performance, and security of the application for which API is used. APIs typically provide all the same services that a web application of the same provider supplies, just without the use of a graphical interface. APIs are meant to act as an interface for answering automated requests, typically provided by processes instead of people.

API Testing Tips for Beginners (SOAP & REST)

Both helpers send requests via HTTP protocol from CodeceptJS process. It can be passed via headers, which can be added to helper’s configuration in codecept.conf.js. Originally, REST and GraphQL helpers were not designed for API testing. They were used to perform API requests for browser tests. The objective of REST Assured is to simplify the process to test and validate RestAPI.

Once the testing process is completed, you can get the result of those tests every day. If failed tests occur, you can check the outputs and validate issues to have proper solutions. Does the tool support test the API/Web service types that your AUT is using? It will not make sense if the selected tool supports testing RESTful services while your AUT is using SOAP services.

Due to this intermediary role of API two applications talk to each other and performs the required actions efficiently. API contains a set of rules and guidelines based on which the applications are developed. So in simple we can say an API acts as an interface between two software applications so that two software applications can communicate with each other.

Apart from these values, we would also have to know about the HTTP method in use, the body, content types of the parameter and response , and also the response value. You will get a clear idea of these aspects when we see a few examples. GET – The GET method can be used to extract information from the given server using a given URI.

Comparing Operations in Rest-Assured and Manual API testing in POSTMAN

API helps in communication and data exchange between two software systems. API act as an interface between two applications and allows the two software systems communicate with one another. API is a collection of functions which can be executed by another software program. A list of frequently asked API Testing interview questions and answers are given below. JSONResponse provides set of assertions for responses in JSON format. These assertions were designed to check only invariable parts of responses.

• Another point they should communicate with the Self-descriptive Messages e.g Use the same MIME types.
• The steps start with visiting the website, filling the form, then submit the form, and verify whether you are navigated to the next screen.
• POST – As the name suggests, a POST request is used to send data to the server.
• APIs encompass all the functions that characterize the business logic layer.
• For example, your web browser can be considered as the client, and the application on the computer that hosts the website can be termed as the server.
• API changes are less frequent – often API definitions files like OpenAPI Spec can help make refactoring tests that only take few seconds.

These items are required to enable basic website functionality. For the case in this blog, we’re going to be using Damn Vulnerable Web Service for our test scenarios. It’s a very simple and easy to use webservice that supports a vulnerable RESTful API we can test. A complete test automation solution with continuous integration trusted by hundreds of thousands of developers and testers. Does the tool support importing API/Web service endpoints from WSDL, Swagger, WADL, and other service specification?

Q: Why Do We Use Static Import In Rest Assured Ans:

API act as the middle layer between the presentation and database layer in the software development process,. They enable communication and data exchange from one software system to another software system. Here are the API interview questions that you should prepare while appearing for the senior profiles. These API testing interview questions are mostly asked to test your knowledge and experience, so try to impress your interviewer by exposing your skill and knowledge. It inherits the security measures of the protocols implementing it. Hence, care must be chosen to implement security measures like integrating SSL/TLS based authentications, etc.

What is API testing?

In other words, a set of commands used by an individual program to communicate with one another directly and use each other’s functions to get information. For example, a Google website can have API for various functions like search, translations, calendars, etc. Web Services uses POST method to perform operations, while REST uses GET method to access the resources. With the use of the REST API the server has no status, we can restart the server between two calls, inspite of all the data is transferred to the server. In API testing, we send a request to API with the known data and then analysis the response.

It means that the between client and server there can be any number of layered systems it does not matter. According to the World Wide Web, clients can cache responses. Responses should, therefore, implicitly or explicitly, define themselves as cacheable. It’s up to server when they want the cache to expired etc.