test_mcp_debug_config_path.py

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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# tests/tests_mcp/test_mcp_debug_config_path.py
 
"""
Purpose
-------
OI-504 regression tests — ``_load_debug_config_patterns()`` must look up
``debug_config.json`` at ``<root>/oc_diagnostics/debug_config.json`` first
(the canonical location since v0.9.0) and fall back to the legacy
``<root>/debug_config.json`` only when the canonical path is absent.
 
Responsibilities
----------------
- Canonical ``oc_diagnostics/debug_config.json`` is preferred when present.
- Legacy root-level ``debug_config.json`` is still read when the canonical
  path is missing.
- Neither path present → returns ``[]`` (safe default, no raise).
 
Diagnostics
-----------
Domain: MCP-TESTS
Levels:
    L2 — test lifecycle
    L3 — assertion details
    L4 — deep tracing
 
Contracts
---------
- Function never raises; returns a list.
"""
 
import json
from pathlib import Path
 
from oct.mcp.config import McpConfig
from oct.mcp.server import _load_debug_config_patterns
 
 
_CANONICAL_PATTERNS = [{"name": "canonical", "pattern": "CANONICAL-SECRET"}]
_LEGACY_PATTERNS = [{"name": "legacy", "pattern": "LEGACY-SECRET"}]
 
 
def _make_config() -> McpConfig:
    return McpConfig(trust_repo_config=True, profile="default")
 
 
def test_canonical_path_preferred(tmp_path: Path):
    (tmp_path / "oc_diagnostics").mkdir()
    (tmp_path / "oc_diagnostics" / "debug_config.json").write_text(
        json.dumps({"redaction_patterns": _CANONICAL_PATTERNS}),
        encoding="utf-8",
    )
    # Legacy file also present — canonical must still win.
    (tmp_path / "debug_config.json").write_text(
        json.dumps({"redaction_patterns": _LEGACY_PATTERNS}),
        encoding="utf-8",
    )
 
    patterns = _load_debug_config_patterns(tmp_path, _make_config())
 
    assert patterns == _CANONICAL_PATTERNS
 
 
def test_legacy_path_used_when_canonical_absent(tmp_path: Path):
    (tmp_path / "debug_config.json").write_text(
        json.dumps({"redaction_patterns": _LEGACY_PATTERNS}),
        encoding="utf-8",
    )
 
    patterns = _load_debug_config_patterns(tmp_path, _make_config())
 
    assert patterns == _LEGACY_PATTERNS
 
 
def test_neither_path_returns_empty(tmp_path: Path):
    patterns = _load_debug_config_patterns(tmp_path, _make_config())
    assert patterns == []