Add test for use command

[joehan]

Description

Going through my usual exercise of trying out new AI by having it write unit tests - this time, AGY wrote tests for the use command.

This is part of a larger effort to increase the test coverage for this repo.

[gemini-code-assist[bot]]

Summary of Changes

Hello @joehan, I'm Gemini Code Assist[^1]! 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 a new suite of unit tests for the use command's setNewActive function. The tests ensure the correct behavior of setting active projects, handling aliases, and managing error conditions, thereby improving the robustness and reliability of the command. This is part of an ongoing effort to enhance the project's test coverage.

Highlights

• New Test File: A new test file, "src/commands/use.spec.ts", has been added to the codebase.
• Unit Tests for use Command: Comprehensive unit tests have been introduced for the setNewActive function within the use command module.
• Covered Scenarios: The tests validate various scenarios including setting active projects by alias, by project ID, creating new aliases, and proper error handling for invalid project selections.
• Increased Test Coverage: This pull request significantly contributes to increasing the overall test coverage for the repository, specifically targeting the use command.

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