[Test Improver] test: add unit tests for deps/_utils.py helpers (~50% -> ~95%)

[danielmeppiel]

🤖 Test Improver — automated AI assistant focused on improving tests for this repository.

Goal and Rationale

src/apm_cli/commands/deps/_utils.py contains 8 pure utility functions used across the deps command group (list, tree, info, update). These functions scan the filesystem for installed packages, count primitives, and build display/info dicts. Despite being used widely, they had no dedicated unit tests (~50% coverage from integration-level tests in other files).

Adding direct unit tests here:

• Catches regressions in directory scanning logic (GitHub 2-level vs ADO 3-level layouts)
• Documents subtle behavior (e.g. _scan_installed_packages does NOT recursively skip children of hidden directories, only the hidden directory itself; APMPackage.source is not populated from apm.yml)
• Enables safe refactoring of these shared helpers

Approach

• 48 tests using pytest.tmp_path for filesystem isolation — no mocking of IO
• Each function has its own TestXxx class; tests cover happy path, empty inputs, edge cases, and error handling
• unittest.mock.patch used only for exception-path tests (verifying graceful fallback)

Coverage Impact

File	Before	After
src/apm_cli/commands/deps/_utils.py	~50%	~95%

Test suite: 3823 → 3871 passing (+48)

Trade-offs

• Tests are filesystem-based (use tmp_path); fast and hermetic, no network/subprocess
• Explicit coverage of the "hidden dir" behavioral quirk documents current behavior as-is (not a bug fix)

Reproducibility

pip install uv --break-system-packages
python3 -m uv sync --extra dev
python3 -m uv run pytest tests/unit/test_deps_utils.py -v
# Full unit suite:
python3 -m uv run pytest tests/unit tests/test_console.py -x -q

Test Status

All 3871 unit tests pass locally on this branch.

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