Google Cloud Professional Cloud Developer — Question 253

You have a web application that publishes messages to Pub/Sub. You plan to build new versions of the application locally and want to quickly test Pub/Sub integration for each new build. How should you configure local testing?

Answer options

• A. Install Cloud Code on the integrated development environment (IDE). Navigate to Cloud APIs, and enable Pub/Sub against a valid Google Project ID. When developing locally, configure your application to call pubsub.googleapis.com.
• B. Install the Pub/Sub emulator using gcloud, and start the emulator with a valid Google Project ID. When developing locally, configure your application to use the local emulator with ${gcloud beta emulators pubsub env-init}.
• C. In the Google Cloud console, navigate to the API Library, and enable the Pub/Sub API. When developing locally, configure your application to call pubsub.googleapis.com.
• D. Install the Pub/Sub emulator using gcloud, and start the emulator with a valid Google Project IWhen developing locally, configure your application to use the local emulator by exporting the PUBSUB_EMULATOR_HOST variable.

Correct answer: B

Explanation

The correct answer is B because it specifies using the Pub/Sub emulator, which allows for accurate local testing without interacting with the live service. Options A and C suggest calling the live Pub/Sub service, which is not suitable for local testing. Option D is incorrect because it lacks the necessary command to initialize the emulator properly.