Education

Postman Mini-Project | Add to Cart API Testing (Real E-Commerce Flow Step-by-Step)

by Automation Step by Step

📚 Main topics

Building the add-to-cart requestThe tutorial adds a POST request using the environment’s base URL, user ID, product ID, and quantity, then checks for a successful creation response. 3:06
Saving and reusing cart dataA test script validates that the cart contains products and saves its ID as an environment variable for use in the next request. 6:17
Getting cart details and validating themA GET request retrieves a cart by ID, with tests for the response status and a positive cart total. The demo notes that DummyJSON does not persist newly created carts. 10:27
Running the complete collectionThe Collection Runner executes the API flow and displays test results and run details. 15:24

✨ Key takeaways

Chain requests with dynamic dataExtract values such as product ID and cart ID from responses, save them in variables, and use them in subsequent requests. 2:04
Test business logic as well as status codesValidate meaningful response data, such as whether the cart contains products and its total is greater than zero. 11:59
Use negative scenarios to find failuresTry missing or expired authorization and an invalid product ID; the tutorial also suggests testing zero quantity and out-of-stock products. 13:39

🧠 Lessons learned

Understand the limits of mock APIsA successful add-to-cart response may not mean the created cart can be retrieved later when the API does not persist data. 10:57
Debug tests and authentication step by stepThe presenter fixes a product-length assertion and reruns login to refresh an expired token. 9:24
Use Postman’s tools to speed up testingSnippets, response-path tools, and Ask AI can help create scripts and validations. 6:17

🏁 Conclusion/next steps

Practice and take the quizRe-create the flow, experiment with additional business scenarios, run the full collection, and take the quiz linked in the video description. 16:47

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Transcript excerpt

0:00 Imagine that you go to an e-commerce app like amazon.com and there you want to check some products or buy some products. So, you will log in, you will browse the products, add to the cart, and then check out. So, this is exactly what we are going to do with APIs. We are going to log in, get the products, pick the products, add to cart, and then we will validate cart. So, in this session, we are going to do this e-commerce flow starting from product cart validation and the complete automation of the flow. And in this

0:32 process, we are going to learn different features of Postman and API testing. We will first create a API flow using products, cart, login, etc. Then, we will also have some get and post requests in this flow. We will understand and learn dynamic data handling. How can we capture the data and then handle it or check it or validate it. We will be using variables and we will be chaining request and response by extracting some values from the response of one API and

1:02 storing it and using it in some other APIs. We will be seeing the test scripts we use and validations. And then we will be using the collection runner to automate the complete flow and also debugging and how we can use AI. So, if you follow along with me and you do this mini project, you will understand this step-by-step and you will already be doing what API testers do in real projects. And as always, we are going to go very basic step-by-step and you can

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