AZ-400 Practice Question: Design and implement build and release pipelines
You are implementing a CI pipeline for a Node.js application. The pipeline must run linting, unit tests, and build the application. Which YAML structure is most appropriate?
⚠ Common exam trap
Watch out — candidates often confuse the need for separate stages or jobs with the concept of modularity, not realizing that for a simple sequential CI workflow, a single job with multiple steps is the most efficient and appropriate structure.
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
✓
Define one job with multiple steps: lint, test, build.
A CI pipeline for a Node.js application typically runs linting, unit tests, and build sequentially within a single job using multiple steps. This ensures that each step executes in order, sharing the same workspace and environment, which is efficient for a simple CI workflow. Defining separate stages (Option A) or multiple jobs (Option C) adds unnecessary overhead and complexity for tasks that are inherently sequential and do not require independent environments.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Define three separate stages: lint, test, build.
Why it's wrong here
Defining three separate stages for lint, test, and build is unnecessary in a simple CI pipeline; stages are designed for deployment gates and environment-specific approvals, not for logically grouping basic build tasks. This approach adds pipeline-level overhead and makes the pipeline more complex without providing any benefit for a basic Node.js application.
- ✗
Define one job with parallel steps using 'parallel' keyword.
Why it's wrong here
Using the 'parallel' keyword to run lint, test, and build concurrently in a single job can cause race conditions and file system collisions because all steps execute simultaneously on the same agent. Additionally, later steps like build often depend on the results of earlier steps, so parallel execution undermines fail-fast behavior and deterministic ordering.
- ✗
Define multiple jobs without dependencies.
Why it's wrong here
Defining multiple jobs without dependencies is inefficient because each job runs on a separate agent and acquires separate resources, which increases cost and setup time. Without dependency constraints, the jobs may execute in any order or simultaneously, making the pipeline slower and potentially producing inconsistent outcomes due to independent workspaces.
- ✓
Define one job with multiple steps: lint, test, build.
Why this is correct
A single job with multiple sequential steps is the simplest and fastest CI approach for a Node.js application, as it runs in one workspace with no inter-job communication overhead. Each step executes in order, automatically stopping the pipeline on the first failure, and step outputs are directly available to subsequent steps.
Go deeper
Related to this question
Learn chapter
Implementing and Managing Source Control
Key term
Pipeline
A pipeline is an automated series of steps that takes code from development to production, ensuring quality and speed.
Key term
Environment
An environment is a dedicated set of computing resources, configurations, and services used to develop, test, or host software applications in a controlled and repeatable way.
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