test: add unit tests for apphosting:backends:create

[joehan]

Description

Working on a new AI workflow for generating tests to improve out coverage. This one seems pretty useful, and is validating some relevant error cases.

[gemini-code-assist]

Summary of Changes

Hello @joehan, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces new unit tests for the apphosting:backends:create command. The primary goal is to enhance code coverage and ensure the command's robustness, specifically by validating its error handling for missing required arguments in non-interactive scenarios and confirming accurate argument propagation to the underlying setup logic.

Highlights

• New Test File Added: A new unit test file, src/commands/apphosting-backends-create.spec.ts, has been added to improve test coverage for the apphosting:backends:create command.
• Non-Interactive Mode Error Handling: The new tests validate that the apphosting:backends:create command correctly throws FirebaseError when required options (--backend and --primary-region) are missing in non-interactive mode.
• Argument Passing Verification: Tests ensure that the doSetup function is called with the correct arguments, both when the command is run in interactive mode (with undefined options) and non-interactive mode (with explicitly provided options).

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[gemini-code-assist]

Code Review

This pull request adds valuable unit tests for the apphosting:backends:create command, effectively increasing test coverage for various scenarios, including error handling in non-interactive mode and parameter passing. The tests are well-structured. I have a couple of suggestions to further improve the test code by reducing duplication and removing unused variables, which will enhance maintainability.