test: make test_health portable for scratch clones (#245)

Use sys.executable with optional GITEA_TOOLS_TEST_PYTHON override instead of
hard-coded venv/bin/python. Add subprocess timeouts/teardown and skip when no
interpreter is available. Note scratch-clone norm in review-pr template.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

skills/llm-project-workflow/templates/review-pr.md

@@ -36,6 +36,8 @@ Rules (llm-project-workflow):
   report the starting worktree path and whether it was dirty. If unrelated
   tracked files exist outside the PR scope, STOP or run
   `scripts/worktree-review <pr-head-branch>` and validate in the scratch path.
+  Scratch-clone validation is the norm; tests must not assume the shared
+  development worktree or a repo-local ``venv/`` (#245).
   NEVER run `git stash`, `git stash pop/drop`, `git checkout --`, `git reset`,
   or `git clean` to manage another session's dirty files.
 - Final report must state: Worktree path, Worktree dirty (yes/no),

tests/test_health.py

@@ -3,9 +3,60 @@ import subprocess
 import sys
 import unittest
 from unittest.mock import patch
+
 import role_session_router
 from mcp_server import gitea_route_task_session, gitea_resolve_task_capability
 
+_HEALTH_SUBPROCESS_TIMEOUT_SEC = 30
+
+
+def _health_test_python():
+    """Portable interpreter for subprocess health checks (#245).
+
+    Prefer the active pytest interpreter, then ``GITEA_TOOLS_TEST_PYTHON``,
+    else skip — never hard-code ``<repo>/venv/bin/python``.
+    """
+    if (
+        sys.executable
+        and os.path.isfile(sys.executable)
+        and os.access(sys.executable, os.X_OK)
+    ):
+        return sys.executable
+    override = (os.environ.get("GITEA_TOOLS_TEST_PYTHON") or "").strip()
+    if override and os.path.isfile(override) and os.access(override, os.X_OK):
+        return override
+    raise unittest.SkipTest(
+        "repo venv not available; run under a python interpreter or set "
+        "GITEA_TOOLS_TEST_PYTHON"
+    )
+
+
+def _run_python_script(cwd, script_path, *, timeout=_HEALTH_SUBPROCESS_TIMEOUT_SEC):
+    """Run a script in a child process with timeout and guaranteed teardown."""
+    python = _health_test_python()
+    proc = subprocess.Popen(
+        [python, script_path],
+        stdout=subprocess.PIPE,
+        stderr=subprocess.PIPE,
+        cwd=cwd,
+    )
+    try:
+        stdout, stderr = proc.communicate(timeout=timeout)
+    except subprocess.TimeoutExpired:
+        proc.kill()
+        stdout, stderr = proc.communicate()
+        raise
+    finally:
+        if proc.poll() is None:
+            proc.terminate()
+            try:
+                proc.wait(timeout=5)
+            except subprocess.TimeoutExpired:
+                proc.kill()
+                proc.wait()
+    return proc.returncode, stdout, stderr, proc
+
+
 class TestMCPHealth(unittest.TestCase):
 
     def setUp(self):
@@ -18,6 +69,17 @@ class TestMCPHealth(unittest.TestCase):
         if os.path.exists(self.temp_file):
             os.remove(self.temp_file)
 
+    def test_health_test_python_prefers_sys_executable(self):
+        resolved = _health_test_python()
+        self.assertEqual(resolved, sys.executable)
+
+    def test_health_test_python_skips_when_no_interpreter(self):
+        with patch.object(sys, "executable", ""), patch.dict(
+            os.environ, {}, clear=True
+        ):
+            with self.assertRaises(unittest.SkipTest):
+                _health_test_python()
+
     def test_startup_conflict_detection(self):
         # Create a Python file with conflict markers constructed dynamically
         with open(self.temp_file, "w") as f:
@@ -27,32 +89,44 @@ class TestMCPHealth(unittest.TestCase):
             f.write("print('world')\n")
             f.write(">" * 7 + " main\n")
 
-        # Run mcp_server.py
-        venv_python = os.path.join(self.project_root, "venv", "bin", "python")
         script_path = os.path.join(self.project_root, "mcp_server.py")
-        res = subprocess.run(
-            [venv_python, script_path],
-            stdout=subprocess.PIPE,
-            stderr=subprocess.PIPE,
-            cwd=self.project_root
+        returncode, _stdout, stderr, _proc = _run_python_script(
+            self.project_root, script_path
         )
 
-        self.assertEqual(res.returncode, 1)
-        stderr = res.stderr.decode()
-        self.assertIn("infra_stop", stderr)
-        self.assertIn("Unresolved merge conflict detected in test_temp_conflict.py", stderr)
+        self.assertEqual(returncode, 1)
+        stderr_text = stderr.decode()
+        self.assertIn("infra_stop", stderr_text)
+        self.assertIn(
+            "Unresolved merge conflict detected in test_temp_conflict.py",
+            stderr_text,
+        )
 
     @patch("role_session_router.check_mid_merge", return_value=True)
-    @patch("mcp_server.get_profile", return_value={"profile_name": "prgs-reviewer", "allowed_operations": ["gitea.pr.review"]})
+    @patch(
+        "mcp_server.get_profile",
+        return_value={
+            "profile_name": "prgs-reviewer",
+            "allowed_operations": ["gitea.pr.review"],
+        },
+    )
     def test_route_task_session_blocks_during_merge(self, mock_profile, mock_check):
         res = gitea_route_task_session("review_pr")
         self.assertEqual(res["route_result"], "infra_stop")
         self.assertIn("infra_stop", res["message"])
 
     @patch("role_session_router.check_mid_merge", return_value=True)
-    @patch("mcp_server.get_profile", return_value={"profile_name": "prgs-reviewer", "allowed_operations": ["gitea.pr.review"]})
-    def test_resolve_task_capability_blocks_during_merge(self, mock_profile, mock_check):
+    @patch(
+        "mcp_server.get_profile",
+        return_value={
+            "profile_name": "prgs-reviewer",
+            "allowed_operations": ["gitea.pr.review"],
+        },
+    )
+    def test_resolve_task_capability_blocks_during_merge(
+        self, mock_profile, mock_check
+    ):
         res = gitea_resolve_task_capability("review_pr")
         self.assertTrue(res["infra_stop"])
         self.assertFalse(res["allowed_in_current_session"])
-        self.assertIn("infra_stop", res["exact_safe_next_action"])
+        self.assertIn("infra_stop", res["exact_safe_next_action"])