[Test Improver] test: expand unit tests for list command (42% -> 100%)

[danielmeppiel]

🤖 Test Improver - automated AI assistant

Goal and Rationale

list_cmd.py is user-facing (shows available scripts to developers) but was only 42% covered. The untested paths included the "no scripts found" case, the Rich table rendering branch, and exception handling. These are all exercised regularly by users.

Approach

Extended the existing tests/unit/test_list_command.py (which had 1 test) with 12 additional tests covering:

• No scripts: warning shown, rich panel attempted → fallback on ImportError / NameError
• Scripts found + console available: Rich table rendered, start annotated as default
• Scripts found + no console: plain-text fallback with all script names
• Rich table raises: fallback to plain text
• No start script: no "default script" annotation
• Exception in _list_available_scripts: sys.exit(1) and error message shown

Coverage Impact

File	Before	After
src/apm_cli/commands/list_cmd.py	42% (23/55 lines)	100% (55/55)

Test Status

All 3041 unit tests pass:

uv run pytest tests/unit/ tests/test_console.py --no-header -q
3041 passed in 13.36s

Reproducibility

# Run just the new tests
uv run pytest tests/unit/test_list_command.py -v

# Coverage
uv run pytest tests/unit/test_list_command.py --cov=apm_cli.commands.list_cmd --cov-report=term-missing

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Pull request overview

Expands unit test coverage for the user-facing apm list command to exercise previously untested output branches (no scripts, Rich vs fallback rendering, and error handling), improving confidence in CLI behavior.

Changes:

• Add comprehensive unit tests for empty-script behavior, including Rich panel attempt and fallback paths.
• Add tests for script listing with/without a default (start) script across Rich and non-Rich output paths.
• Add tests for exception handling to ensure failures exit with code 1 and emit an error message.