API testing is a crucial aspect of modern software development, and data-driven testing is an effective technique to test APIs with varying input data. Newman CLI is a powerful tool that can be used to automate API testing and perform data-driven testing. Let’s see how we can do that –
What is Newman CLI?
Newman CLI is a command-line tool developed by Postman that allows you to run Postman collections from the command line. It provides a way to execute Postman collections in an automated and continuous manner, making it a popular tool for API testing and integration testing.
Prerequisites
- Create a Postman collection with the requests to be tested.
- Optionally, write tests for each request to validate the expected results.
- Export the collection so that it can be accessed by Newman CLI.
- Prepare a data file in CSV or JSON format to provide different input data for each test run.
Check out this post to see how to do this step-by-step.
How to do Data Driven Testing using Newman CLI?
To conduct data-driven testing with Newman CLI, you must execute the collection with the newman run command and then use the -d flag to provide the data file. Here’s an example:
newman run sample.postman_collection.json -d data.json
The above command will run all the iterations and return similar results –
To learn more, check out the video below –
Conclusion
Data-driven testing is a powerful technique to test APIs with varying input data. Newman CLI is a powerful tool that can be used to automate API testing and perform data-driven testing. With Newman CLI, you can easily perform data-driven testing and catch bugs and issues early in the development cycle.
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