[Test Improver] test: add unit tests for mcp command (0% -> ~85%)

[danielmeppiel]

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Goal and Rationale

src/apm_cli/commands/mcp.py (379 lines) had zero dedicated unit tests. It implements three user-facing CLI commands (search, show, list) that hit the MCP registry. Each command has two execution paths: a Rich console path and a plain-text fallback path. Testing both paths guards against regressions in either rendering mode.

Approach

Added tests/unit/test_mcp_command.py with 25 tests covering:

Area	Tests
mcp search - Rich path with results	4 tests
mcp search - fallback (no Rich) + error handling	4 tests
mcp show - Rich path (success, not found, edge cases)	6 tests
mcp show - fallback + error handling	3 tests
mcp list - Rich path + fallback + error handling	6 tests
mcp --help / group	1 test
Total	25 tests

All tests mock RegistryIntegration to avoid live network calls. The RegistryIntegration and rich.table.Table are imported lazily inside function bodies, so they are patched at their canonical module locations (apm_cli.registry.integration.RegistryIntegration and rich.table.Table).

Coverage Impact

File	Before	After (est.)
commands/mcp.py	~0%	~85%

Test Status

All 3133 unit tests pass:

python3 -m uv run pytest tests/unit tests/test_console.py -x -q
3133 passed in 15.59s

Reproducibility

# Run only new tests
uv run pytest tests/unit/test_mcp_command.py -v

# Run full unit suite
uv run pytest tests/unit tests/test_console.py -x -q

Trade-offs

• Tests mock the registry entirely, so they don't catch changes in RegistryIntegration's API contract — those are covered by the existing integration tests.
• rich.table.Table is patched at the library level so table rendering itself isn't verified, but the control flow and command outcomes are.

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