? Automating API Tests

? Quick Overview

API test automation allows you to run repeatable, reliable tests without manual effort. Tools like Postman support CLI-based execution and easy integration with CI/CD pipelines.

? Key Concepts

Automated API collections
Command-line execution
Continuous Integration
Continuous Deployment
Test reports & exit codes

? Syntax / Theory

Postman collections can be exported and executed using a CLI runner. Automated tests validate response status, headers, body, and performance.

? Code Example(s)

? View Code Example

// Run a Postman collection using Newman CLI
newman run UserAPI.postman_collection.json

? View Code Example

// Sample test script inside Postman
pm.test("Status code is 200", function () {
pm.response.to.have.status(200);
});

? Live Output / Explanation

CLI Output

Newman prints test results, assertions passed/failed, execution time, and returns a non-zero exit code if tests fail.

? Interactive Example

Click the button to simulate a CLI API test run inside a CI pipeline:

// Waiting to start...

? Use Cases

Regression testing before deployment
Automated checks in CI/CD pipelines
Monitoring API stability
Team-wide test standardization

? Tips & Best Practices

Keep collections modular and reusable
Use environment variables for URLs and tokens
Fail fast using strict assertions
Integrate reports for visibility

? Try It Yourself

Create a simple API collection in Postman
Add at least two test assertions
Export and run it using Newman CLI
Integrate the command into a CI pipeline