The answer is an Amazon EventBridge rule for CodeCommit pull request state changes targeting AWS Lambda. This is correct because CodeCommit natively emits events to EventBridge whenever a pull request is created, updated, or merged, and EventBridge can filter for the specific “pullRequestCreated” state change to trigger a Lambda function that runs the unit tests. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of event-driven automation within the CI/CD pipeline, often appearing as a distractor where candidates mistakenly choose CodePipeline or CodeBuild as the trigger source—but those services are for build and deploy orchestration, not for reacting to repository events. A common trap is forgetting that CodeCommit does not directly invoke Lambda; it relies on EventBridge as the intermediary. Memory tip: think “CodeCommit emits, EventBridge filters, Lambda executes”—the three-step event chain for pull request automation.
DOP-C02 SDLC Automation Practice Question
This DOP-C02 practice question tests your understanding of sdlc automation. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A developer wants to automatically run unit tests when a pull request is created in AWS CodeCommit. Which AWS service should be used to trigger the tests?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Amazon EventBridge rule for CodeCommit pull request state changes targeting AWS Lambda.
CodeCommit can trigger Amazon EventBridge events on pull request creation, which can invoke a Lambda function to run tests. Option C is correct.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
AWS CodePipeline with source polling.
Why it's wrong here
Polling is inefficient and not event-driven for pull requests.
✗
AWS CodeBuild with webhooks from CodeCommit.
Why it's wrong here
CodeBuild webhooks trigger on pushes, not pull requests.
✗
AWS CloudWatch Logs subscription filter for repository logs.
Why it's wrong here
CloudWatch Logs subscription is not for triggering on events.
✓
Amazon EventBridge rule for CodeCommit pull request state changes targeting AWS Lambda.
Why this is correct
EventBridge can capture pull request events and invoke Lambda.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
SDLC Automation — This question tests SDLC Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Amazon EventBridge rule for CodeCommit pull request state changes targeting AWS Lambda. — CodeCommit can trigger Amazon EventBridge events on pull request creation, which can invoke a Lambda function to run tests. Option C is correct.
What should I do if I get this DOP-C02 question wrong?
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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