How can you set up local testing for a web application that publishes messages to Pub/Sub when developing new versions locally and needing to verify Pub/Sub integration for each build?

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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.

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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}.

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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.

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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.

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How can you set up local testing for a web application that publishes messages to Pub/Sub when developing new versions locally and needing to verify Pub/Sub integration for each build?