Postman Sandbox Assertions, Data‑Driven Testing, Workflow, Newman CLI, and Jenkins Integration

Postman provides a JavaScript sandbox that allows you to write pre‑request scripts (similar to a unit test setUp() ) and test scripts that run after a response is received.

Assertion example : For a POST request to postman-echo.com/post , the expected response status is 200, the returned user value must match the defined variable, and the response time should be under 0.5 s. The test script sets a variable user and then checks status, response content, and response time using pm.test and pm.expect .

pm.variables.set("user",'zxw');
// Status code check
pm.test("Status code is 200", function () {
  pm.response.to.have.status(200);
});
// Get variable value
username = pm.variables.get("user");
console.log(username);
// Verify response content
pm.test("Check username", function () {
  var jsonData = pm.response.json();
  pm.expect(jsonData.json['user']).to.eql(username);
});
// Verify response time
pm.test("Response time is less than 500ms", function () {
  pm.expect(pm.response.responseTime).to.be.below(500);
});

Batch running collections : Use the Collection Runner to execute multiple API requests together, configuring environment variables, iteration count, and delay between requests.

Data‑driven testing : Import an external JSON file (e.g., data.json ) containing different parameter sets, such as usernames and passwords, to run the same request with varied data. Example data file:

[
  {"username": "jack", "passwd": "6666"},
  {"username": "Bob",  "passwd": "5555"},
  {"username": "Marry","passwd": "8888"}
]

Set a request delay of 1000‑3000 ms to avoid throttling and remember to save environment variables.

Building a workflow : Control request execution order by adding postman.setNextRequest('Request 3') (or other request names) in the Test script of each request.

postman.setNextRequest('Request 3')
postman.setNextRequest('Request 2')
postman.setNextRequest('Request 4')

Newman CLI : Newman, a Node.js‑based tool, runs Postman collections from the command line. Example command:

newman run Postman_API.postman_collection.json -d data.json -r html

Options: run specifies the collection, -d provides the data file, and -r selects the report format (HTML).

Jenkins integration : Create a Jenkins job, add a Windows batch command step, and execute the Newman command. Example batch script:

c:
cd C:\Users\Shuqing\Desktop\pmtest\
newman run Postman_API.postman_collection.json -d data.json -r html

The job runs the collection and produces an HTML test report.

Additional features : Postman can export scripts in various languages and capture mobile‑device traffic.