Newman in CI/CD pipelines in Postman

Introduction

Newman helps run Postman API tests automatically in your software build process. It makes sure your APIs work well every time you update your code.

You want to check your APIs automatically after every code change.

You need to run API tests on a server without Postman app installed.

You want to include API tests as part of your software delivery process.

You want to get test results in your build logs or reports.

You want to stop a deployment if API tests fail.

Syntax

Postman

newman run <collection-file.json> [options]

Replace with your exported Postman collection file.

Options can include environment files, reporters, and more.

Examples

Runs the Postman collection named mycollection.json with default settings.

Postman

newman run mycollection.json

Runs the collection using environment variables from myenv.json.

Postman

newman run mycollection.json -e myenv.json

Runs the collection and outputs test results in JUnit XML format for CI tools.

Postman

newman run mycollection.json -r cli,junit --reporter-junit-export results.xml

Sample Program

This command runs the Postman collection sample_collection.json using environment variables from sample_environment.json. It shows results in the command line and saves a JSON report file newman_report.json.

Postman

newman run sample_collection.json -e sample_environment.json -r cli,json --reporter-json-export newman_report.json

Important Notes

Make sure Node.js and Newman are installed on your CI server.

Use environment files to test different API setups easily.

Integrate Newman commands into your CI scripts like Jenkins, GitHub Actions, or GitLab CI.

Summary

Newman runs Postman API tests from the command line.

It fits well into CI/CD pipelines to automate API testing.

Use options to customize test runs and generate reports.

Practice

1. What is the main purpose of using Newman in a CI/CD pipeline?

easy

A. To write new API tests inside Postman

B. To run Postman API tests automatically from the command line

C. To deploy applications to production servers

D. To monitor server performance in real-time

Solution

1. Step 1: Understand Newman's role

   Newman is a command-line tool designed to run Postman API tests outside the Postman app.

2. Step 2: Connect to CI/CD pipeline use

   In CI/CD pipelines, Newman automates running these tests to check API health during builds or deployments.

3. Final Answer:

   To run Postman API tests automatically from the command line -> Option B

4. Quick Check:

   Newman runs tests in CI/CD = C [OK]

Hint: Newman runs Postman tests from command line in pipelines [OK]

Common Mistakes:

• Confusing Newman with deployment tools
• Thinking Newman writes tests instead of running them
• Assuming Newman monitors servers

2. Which of the following is the correct basic syntax to run a Postman collection using Newman?

easy

A. newman run collection.json

B. newman execute collection.json

C. newman start collection.json

D. newman test collection.json

Solution

1. Step 1: Recall Newman command structure

   The correct command to run a collection is 'newman run' followed by the collection file.

2. Step 2: Verify options

   Options like 'execute', 'start', or 'test' are not valid Newman commands.

3. Final Answer:

   newman run collection.json -> Option A

4. Quick Check:

   Correct Newman run syntax = D [OK]

Hint: Use 'newman run' to execute collections [OK]

Common Mistakes:

• Using 'execute' or 'start' instead of 'run'
• Omitting the 'run' keyword
• Confusing Newman commands with other tools

3. What will be the output when running this command in a CI pipeline?

newman run mycollection.json --reporters cli,json --reporter-json-export result.json

medium

A. Runs tests and outputs results only in CLI, no file created

B. Runs tests and saves results only in XML format

C. Runs tests but fails due to invalid reporter options

D. Runs tests, shows CLI output, and saves JSON report to result.json

Solution

1. Step 1: Analyze reporter options

   The command uses '--reporters cli,json' to show results in CLI and JSON format.

2. Step 2: Check JSON export flag

   '--reporter-json-export result.json' saves the JSON report to the file 'result.json'.

3. Final Answer:

   Runs tests, shows CLI output, and saves JSON report to result.json -> Option D

4. Quick Check:

   CLI + JSON report saved = B [OK]

Hint: Multiple reporters show CLI and save JSON report [OK]

Common Mistakes:

• Assuming no file is created
• Thinking JSON export is invalid syntax
• Confusing JSON with XML report format

4. You added this command in your CI pipeline:

newman run collection.json --reporters cli --reporter-json-export report.json

But the JSON report file is not created. What is the likely problem?

medium

A. The CLI reporter disables file exports

B. The collection.json file is missing

C. Missing 'json' in the --reporters option

D. Newman does not support JSON reports

Solution

1. Step 1: Check reporter options consistency

   The command uses '--reporters cli' but tries to export JSON report, which requires 'json' reporter enabled.

2. Step 2: Understand reporter behavior

   Without 'json' in '--reporters', the JSON export flag is ignored, so no file is created.

3. Final Answer:

   Missing 'json' in the --reporters option -> Option C

4. Quick Check:

   JSON export needs 'json' reporter = A [OK]

Hint: Include 'json' in --reporters to export JSON files [OK]

Common Mistakes:

• Assuming collection file missing causes no report
• Thinking CLI reporter blocks file exports
• Believing Newman can't export JSON reports

5. In a CI/CD pipeline, you want to fail the build if any Postman test fails using Newman. Which command option helps achieve this?

hard

A. --bail

B. --fail-fast

C. --exit-on-error

D. --stop-on-failure

Solution

1. Step 1: Identify Newman option for failure control

   The '--bail' option stops the run and returns a failure exit code if any test fails.

2. Step 2: Confirm other options

   Options like '--fail-fast', '--exit-on-error', and '--stop-on-failure' are not valid Newman flags.

3. Final Answer:

   --bail -> Option A

4. Quick Check:

   Fail build on test failure = --bail [OK]

Hint: Use '--bail' to stop and fail on test errors [OK]

Common Mistakes:

• Using non-existent flags like --fail-fast
• Not using any fail option, so build passes despite failures
• Confusing '--bail' with report generation options