AZ-400 Practice Question: Design and implement build and release pipelines
Exhibit
Refer to the exhibit. You have the following YAML pipeline snippet:
```yaml
jobs:
- job: Build
steps:
- task: DotNetCoreCLI@2
inputs:
command: 'build'
projects: '**/*.csproj'
- task: PublishBuildArtifacts@1
inputs:
PathtoPublish: '$(Build.ArtifactStagingDirectory)'
ArtifactName: 'drop'
```The pipeline fails because the artifact is empty. What is the most likely cause?
⚠ Common exam trap
The trap here is that candidates often focus on file matching patterns or task names, but the core issue is the missing copy step to the staging directory, which is a fundamental pipeline design concept.
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
✓
The build output is not copied to the staging directory
The most common reason for an empty artifact in Azure Pipelines is that the build output files were not copied to the staging directory (typically $(Build.ArtifactStagingDirectory)) before the PublishBuildArtifacts task runs. The PublishBuildArtifacts task publishes whatever is in the staging directory; if no files are copied there, the artifact will be empty. This is a standard pattern where a Copy Files task or similar step must explicitly place the build outputs into the staging directory.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The build output is not copied to the staging directory
Why this is correct
The PublishBuildArtifacts task publishes files from a staging directory (e.g., $(Build.ArtifactStagingDirectory)). If your build tasks only compile but never copy the compiled output (DLLs, EXEs) to that staging path, Azure DevOps uploads an empty folder, so the artifact contains no files despite the build succeeding.
- ✗
The projects pattern '**/*.csproj' does not match any files
Why it's wrong here
If the '**/*.csproj' pattern matched zero project files, the MSBuild or dotnet build task would fail immediately with a 'project(s) matching the pattern were not found' error. Because the build actually reached the artifact-publishing step, this pattern did match projects, so it cannot be the cause of the empty artifact.
- ✗
The task 'PublishBuildArtifacts@1' is misspelled
Why it's wrong here
The task name 'PublishBuildArtifacts@1' is a valid, built-in Azure DevOps task identifier. A misspelled task name would trigger a 'task not found' error during pipeline validation or execution, not a successful build that then produces an empty artifact, so this option is incorrect.
- ✗
The artifact name 'drop' is invalid
Why it's wrong here
Azure DevOps allows the artifact name 'drop'; in fact, 'drop' is the default artifact name in classic pipeline templates. If the name were invalid, the PublishBuildArtifacts task would reject it with a naming error, but an empty artifact from a valid publish step indicates the staging folder never received the build output, not an invalid name.
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
Pipeline
A pipeline is an automated series of steps that takes code from development to production, ensuring quality and speed.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This AZ-400 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-400 exam.