Test Coverage Assessment for PR #72

Summary

The test coverage for the new tree command is adequate and consistent with the testing patterns established in this codebase.

What is covered

• Command structure: Flags (--depth, --files, --json), argument validation (0 or 1 args), and descriptions
• printTree() function: Thoroughly tested with 5 scenarios including single node, children, nested trees, deeply nested trees, and empty children
• TreeNode struct: JSON serialization and nil children handling

What is not covered

The buildTree() function (the core recursive logic) is not tested. This includes:

• Folder vs file sorting (folders first, then alphabetically)
• Depth limiting behavior
• Error handling when API calls fail
• Query construction for the --files flag

Assessment

This is acceptable given the established testing patterns in this codebase. Looking at the sibling commands (list, get, download, search), they all follow the same approach:

• Test command structure and flags
• Test pure helper functions (buildListQuery, getMimeTypeFilter, formatSize, determineOutputPath, printFileDetails)
• Do not test the run* functions or mock the API client

The codebase has infrastructure for mocking via ClientFactory, but it's not currently used in any drive command tests. Adding mock-based tests for buildTree() would be nice but is not required to maintain consistency.

Verdict

Tests are sufficient - the PR follows the established testing conventions. The critical output formatting logic (printTree()) is well-tested, and the command structure is validated. Future work could add integration tests or mock-based unit tests for buildTree(), but this is not a blocker.