AWS DVA-C02 Drill: Amplify CI/CD Testing - Integrating End-to-End Tests in Build

Jeff’s Note

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Unlike generic exam dumps, ADH analyzes this scenario through the lens of a Real-World Lead Developer.

For DVA-C02 candidates, the confusion often lies in where and how to implement automated testing within Amplify’s build and deploy pipeline. In production, this is about knowing exactly how to embed test phases into CI/CD workflows to catch bugs before deployment. Let’s drill down.

The Certification Drill (Simulated Question)

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Scenario

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NextGen Fitness Apps, a startup building an interactive workout tracker, uses AWS Amplify Hosting for their front-end React application. Recently, the development team noticed a rise in reported bugs from users after deployment. To improve code quality and reduce production bugs, the lead developer wants to incorporate end-to-end (E2E) testing as part of the application’s continuous delivery workflow.

The Requirement:

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Implement automated end-to-end tests that run during the build and deploy process in AWS Amplify Hosting to catch bugs before code reaches production.

The Options

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• A) Run the amplify add test command in the Amplify CLI.
• B) Create unit tests inside the application code and deploy them by running amplify push in the Amplify CLI.
• C) Add a test phase to the amplify.yml build settings for the application.
• D) Add a test phase to the aws-exports.js file for the application.

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Correct Answer

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C) Add a test phase to the amplify.yml build settings for the application.

Quick Insight: The Developer Imperative

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For DVA-C02, knowing how to integrate testing into the Amplify build lifecycle is key — setting up test commands in amplify.yml allows automated tests to run at build time, preventing buggy deployments.

Content Locked: The Expert Analysis

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You’ve identified the answer. But do you know the implementation details that separate a Junior from a Senior?

The Expert’s Analysis

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Correct Answer

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Option C

The Winning Logic

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AWS Amplify uses a configuration file called amplify.yml to define build steps for the application pipeline. By adding a dedicated test phase in this YAML file, developers can specify commands that run their automated tests (unit, integration, or end-to-end) before the app is deployed. This ensures test failures block faulty releases, applying Continuous Integration best practices.

• Running tests inside the Amplify build process integrates seamlessly with Amplify Hosting’s managed CI/CD.
• The build steps support complex commands, including running E2E tests with frameworks like Cypress or Jest.
• This method aligns with Amplify’s intended use of amplify.yml as the core pipeline configuration.

The Trap (Distractor Analysis)

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• Why not A?
  No such command as amplify add test exists in Amplify CLI. This is a fictitious option.

• Why not B?
  While unit tests belong in application code, simply pushing code with amplify push does not run them automatically. Tests must be executed during builds, not just deployed.

• Why not D?
  The aws-exports.js file is a configuration artifact generated by Amplify, unrelated to build or test execution phases. It does not control testing workflows.

The Technical Blueprint

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# Example snippet to add in amplify.yml to run tests during the build phase

version: 1
frontend:
  phases:
    preBuild:
      commands:
        - npm ci
    build:
      commands:
        - npm run build
    test:
      commands:
        - npm run test:e2e  # your E2E test command here
  artifacts:
    baseDirectory: build
    files:
      - '**/*'
  cache:
    paths:
      - node_modules/**/*

This configuration tells Amplify Hosting to run the specified E2E tests during the build’s test phase, blocking deployment if tests fail.

The Comparative Analysis

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Real-World Application (Practitioner Insight)

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Exam Rule

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For the exam, always look for the use of amplify.yml test phase when the question involves automated testing in Amplify.

Real World

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In production, many teams build custom shell scripts or npm scripts invoked via amplify.yml test phases to run integration and E2E tests using frameworks like Cypress or Playwright, ensuring bugs are caught early.

(CTA) Stop Guessing, Start Mastering

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Disclaimer

This is a study note based on simulated scenarios for the DVA-C02 exam.