[Test Improver] test: add unit tests for compile CLI display helpers

[danielmeppiel]

🤖 Test Improver — automated AI assistant

Goal and Rationale

The apm compile command has 578 lines of CLI logic, but only a single subprocess-level integration test (test_compile_rich_output.py, 19 lines). The four display helper functions — _get_validation_suggestion, _display_validation_errors, _display_next_steps, and _display_single_file_summary — had zero unit tests. These helpers are called on every successful or failed compilation and handle user-facing feedback including validation errors.

Approach

Unit tests for the four pure/display-layer helpers in apm_cli.commands.compile.cli:

Function	What's tested
_get_validation_suggestion	All 4 branches: description, applyTo, empty content, generic fallback; type safety; case sensitivity
_display_validation_errors	Rich table path, no-console fallback, ImportError fallback, colon-split error parsing, empty error list, multi-error table
_display_next_steps	Rich panel path, no-console fallback, ImportError fallback, custom output filename in output
_display_single_file_summary	Rich table path, no-console fallback, dry-run mode, real file size computation, missing stats .get() defaults, None hash renders as -, exception fallback

Mocks patch apm_cli.commands.compile.cli._get_console (the resolved import name) so tests work without a live terminal.

Coverage Impact

Module	Before	After (estimated)
commands/compile/cli.py (helpers only)	~0% for display helpers	~80%+ for helper functions

Trade-offs

• Tests cover the display and fallback paths; the main compile() Click command orchestration is out of scope (requires project fixture setup and is covered by the subprocess integration test).
• No new dependencies added.

Reproducibility

uv run pytest tests/unit/test_compile_cli_helpers.py -v
```

## Test Status

**23/23 tests pass. 3422 total tests pass (0 regressions).**

```
tests/unit/test_compile_cli_helpers.py::TestGetValidationSuggestion::test_missing_description_branch PASSED
tests/unit/test_compile_cli_helpers.py::TestGetValidationSuggestion::test_missing_applyto_branch PASSED
tests/unit/test_compile_cli_helpers.py::TestGetValidationSuggestion::test_empty_content_branch PASSED
tests/unit/test_compile_cli_helpers.py::TestGetValidationSuggestion::test_unknown_error_returns_generic PASSED
tests/unit/test_compile_cli_helpers.py::TestGetValidationSuggestion::test_case_sensitive_matching PASSED
tests/unit/test_compile_cli_helpers.py::TestGetValidationSuggestion::test_returns_string_for_all_branches PASSED
tests/unit/test_compile_cli_helpers.py::TestDisplayValidationErrors::test_rich_path_with_colon_error PASSED
... (23 total, all PASSED)
23 passed in 0.27s

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