AZ-400 Practice Question: Design and implement build and release pipelines
You are designing a build pipeline for a Node.js application. The team wants to ensure that the pipeline runs unit tests and publishes test results to Azure DevOps. Which task should you add to the pipeline?
⚠ Common exam trap
Candidates often confuse running tests (npm test) with publishing test results, not realizing that Azure DevOps requires a separate task to ingest and display test outcomes in the pipeline UI.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Publish Test Results task
The Publish Test Results task (A) is correct because it specifically ingests test result files (e.g., JUnit, NUnit, xUnit, or TRX formats) and publishes them to Azure DevOps, enabling test analytics, trend charts, and pass/fail reporting in the pipeline summary. For a Node.js application, after running unit tests with a framework like Jest or Mocha, the test results are typically output as JUnit XML files, and this task is required to make those results visible in the DevOps portal.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Publish Test Results task
Why this is correct
The Publish Test Results task is correct because it explicitly consumes test result files (e.g., JUnit, NUnit, VSTest) and uploads them to Azure Pipelines, enabling test analytics, failure reporting, and trend dashboards in the build summary.
- ✗
Copy Files task
Why it's wrong here
The Copy Files task is incorrect for this purpose because it only copies files (like build output or static assets) to a destination directory; it does not parse, process, or publish test result files to Azure DevOps for reporting.
- ✗
npm test
Why it's wrong here
The npm test task is incorrect because it simply runs the 'test' script in package.json and returns a pass/fail exit code; the detailed test results remain as console output or local files unless a separate Publish Test Results task is added to upload them.
- ✗
Publish Build Artifacts task
Why it's wrong here
The Publish Build Artifacts task is incorrect for publishing test results because its sole purpose is to make build outputs (e.g., compiled binaries, packages) available for release pipelines; test results require a dedicated Publish Test Results task to integrate with Azure DevOps test management.
Go deeper
Related to this question
Learn chapter
Introduction to DevOps and Azure DevOps
Key term
Task
A Task in Azure DevOps is a predefined, reusable step that performs a specific action during a build or release pipeline, like compiling code or running tests.
Key term
Azure DevOps
Azure DevOps is a Microsoft service that provides development tools for planning, building, testing, and deploying software applications using automated pipelines and collaboration features.
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