Google Professional Cloud Developer Question 279
Select 3Google Cloud PlatformYou are developing a serverless application that uses Cloud Firestore as a database. To ensure your integration tests do not affect production data, you decide to use emulators. Which steps should you take to correctly integrate the Cloud Firestore Emulator into your testing environment?
- A
Start the Cloud Firestore Emulator locally before running the tests.
- B
Set the FIRESTORE_EMULATOR_HOST environment variable to point to the emulator's endpoint.
- C
Deploy the application to a staging Google Cloud project and run the tests using the staging environment.
- D
Ensure your application uses the Cloud Firestore client library and connects to the emulator during tests.
- E
Run the tests directly against the production Firestore instance to validate production behavior.
Show answer and explanation
Correct answers: A, B, D
Explanation
Using emulators for integration testing helps isolate your tests from production data and ensures accurate simulation of cloud services. To properly use the Cloud Firestore Emulator, it must be started locally, the application must be configured to connect to it using the FIRESTORE_EMULATOR_HOST environment variable, and the application should use the appropriate client library to interact with the emulator. This approach prevents unintended side effects in your production environment.
- A. Correct.
Correct. The Cloud Firestore Emulator needs to be running locally to simulate the Firestore service during tests.
- B. Correct.
Correct. Setting the FIRESTORE_EMULATOR_HOST environment variable ensures that the application connects to the emulator rather than the production Firestore service.
- C. Incorrect.
Incorrect. Deploying to a staging environment is not necessary for integration testing with the emulator, as the emulator can be run locally.
- D. Correct.
Correct. The application should use the Cloud Firestore client library and be configured to connect to the emulator during tests for accurate simulation.
- E. Incorrect.
Incorrect. Running tests against the production Firestore instance can lead to unintended data modifications and is not recommended for integration testing.