REST API Testing with Python & Robot Framework

we start automating REST API testing using Python and Robot Framework. We send a GET request to retrieve the product list from a live API and validate: HTTP Status Code = 200  Response format is JSON  "products" key exists  Product list is not empty By the end of this video, you will learn: How to send an API request using Python Requests How Robot Framework calls Python functions as keywords How to validate API responses in automation How to check response data using assertions This is Lesson #1 in the REST API Automation Series — step by step from beginner to Test Automation Ninja! ?

We intentionally send a POST request to the /productsList endpoint — which only supports GET. A well-designed API must respond with:  Status Code: 405 – Method Not Allowed Error message in JSON format  No product data returned What you will learn in this lesson: How to perform negative testing in REST APIs How Python requests and Robot Framework work together How to validate response codes and JSON fields Why APIs must reject unsupported HTTP methods for security Test Validation Steps:  Robot calls a Python keyword  Python sends POST request → validates HTTP status  Robot checks "responseCode" inside JSON  Automation marks PASS or FAIL automatically This is the 2nd lesson in the REST API Test Automation Series — step-by-step to becoming a Test Automation Ninja

In this lesson, we automate a GET request to retrieve the brand list from a live e-commerce API. We verify that the server returns valid data and responds correctly when fetching all available brands.  What You Will Learn How to automate GET requests using Python + Requests How to integrate Python functions as keywords in Robot Framework How to validate API response structure and JSON format How to verify critical backend data — brand list for an e-commerce store Why API automation is essential for backend stability and data integrity ? Test Validations HTTP status code must be 200 OK Response body must be valid JSON JSON must contain the "brands" key The "brands" list must be not empty — so there are actual brands returned A working brand list is essential for filtering and browsing products in the UI — this test ensures the backend supports critical features for users

In this lesson, we implement a negative test scenario in our REST API automation framework. We send a PUT request to the /brandsList endpoint, which only supports GET requests — and we confirm that the server properly rejects the operation. ? What You Will Learn How to automate a PUT request using Python + Requests What a 405 Method Not Allowed response means How to validate error handling in APIs How to ensure backend security by negative testing How to assert JSON error codes and messages in Robot Framework  Expected Behavior HTTP wrapper returns 200 (API design behavior) JSON responseCode must be 405 JSON message: "This request method is not supported." Negative tests are critical — APIs need to fail correctly, not only work correctly.

In this lesson, we automate a POST request to the /searchProduct endpoint of a live e-commerce API. We send a search keyword such as "top" and verify that the backend returns a non-empty product list in a valid JSON format. This confirms that the search functionality — one of the most critical features in any online store — is working correctly on the server side.  What You Will Learn in This Video How to automate POST API calls using Python (Requests library) How to integrate Python keywords into Robot Framework How to validate JSON response structures How to confirm meaningful business results: products must be returned API positive testing methodology ? Validation Criteria We check that: Status Code = 200 OK Response is valid JSON "products" key exists Product list is not empty If any check fails → test fails ? If all pass → search backend is healthy and functional