Postman | Test Automation Tools | Automatedtesting Tutorial

Introduction to Postman

Postman is a powerful API testing tool that allows developers and testers to create, share, and test APIs. It provides a user-friendly interface to send requests to web servers and view responses. With Postman, you can automate API tests, making it easier to ensure that your applications work as intended.

Getting Started with Postman

To begin using Postman, you need to download and install it. You can find the latest version on the Postman official website.

Once installed, open Postman. You'll be greeted with a clean interface where you can start creating requests.

Creating Your First Request

To create a new request, follow these steps:

Open Postman and click on the New button.
Select Request.
Enter a request name and choose a collection to save it to.
Click Create.

In the request tab, you can select the HTTP method (GET, POST, PUT, DELETE, etc.) and enter the URL of the API endpoint you want to test.

Example:

Select the GET method and enter https://jsonplaceholder.typicode.com/posts as the URL.

Click the Send button to execute the request. You will see the response in the lower section of the interface.

Understanding Responses

Postman displays the API response in a structured format, including the status code, response time, and response size. The response body can be viewed in different formats like JSON, XML, or HTML.

Example Response:


                        [
                            {
                                "userId": 1,
                                "id": 1,
                                "title": "sunt aut facere repellat provident occaecati excepturi optio reprehenderit",
                                "body": "quia et suscipit\nsuscipit..."
                            },
                            ...
                        ]

Testing APIs with Postman

Postman allows you to write tests for your API responses using JavaScript. These tests can be used to validate response status codes, response times, and specific data in the response body.

To add tests, navigate to the Tests tab in your request. Here is a sample test script:

Example Test Script:


                        pm.test("Status code is 200", function () {
                            pm.response.to.have.status(200);
                        });
                        pm.test("Response time is less than 200ms", function () {
                            pm.expect(pm.response.responseTime).to.be.below(200);
                        });

Click Send again to run the tests. The results will show up in the Test Results section.

Automating Tests with Collections

Postman Collections allow you to group related requests and run them together. You can create a collection by clicking on Collections in the left sidebar and then New Collection. Once your requests are added to a collection, you can run them in sequence.

To run a collection:

Click on the collection name.
Click on the Run button.
Choose the requests to run and click Run Collection.

Conclusion

Postman is an essential tool for API development and testing. With its intuitive interface and powerful features, you can easily create requests, validate responses, and automate your testing process. Explore further features such as environment variables, pre-request scripts, and monitoring to enhance your API testing experience.

Postman Tutorial