fix(mcp): isolate helper coverage from test proxy startup

tests/integration/_support/process.py

@@ -103,6 +103,8 @@ def owned_proxy_process(
         "LITELLM_MASTER_KEY": gateway.key,
         "LITELLM_SALT_KEY": os.environ.get("LITELLM_SALT_KEY", "sk-integration-salt"),
         "STORE_MODEL_IN_DB": "True",
+        "COVERAGE_PROCESS_CONFIG": "",
+        "COVERAGE_PROCESS_START": "",
         **overrides,
     }
     output: Final = Path(os.environ.get("INTEGRATION_RESULTS_DIR", str(directory)))

tests/integration/conformance_coverage.toml

@@ -3,7 +3,7 @@ branch = true
 parallel = true
 relative_files = true
 patch = ["subprocess"]
-include = ["tests/integration/_support/conformance.py"]
+include = ["tests/integration/_support/conformance.py", "tests/integration/_support/process.py"]
 
 [tool.coverage.report]
 show_missing = true

tests/unit/integration_support/test_conformance.py

@@ -1,13 +1,41 @@
 import hashlib
 import json
+import os
 from pathlib import Path
 from typing import Final
+from unittest.mock import Mock, patch
 
 import pytest
 from tests.integration._support.conformance import read_checks, verify_archive, prefixed_request
 from pydantic import ValidationError
 
 
+@pytest.mark.parametrize("explicit", (False, True))
+def test_owned_proxy_isolates_automatic_coverage_unless_requested(
+    tmp_path: Path, monkeypatch: pytest.MonkeyPatch, explicit: bool
+) -> None:
+    from integration._support.client import Gateway
+    from integration._support.process import owned_proxy_process
+
+    monkeypatch.setenv("COVERAGE_PROCESS_CONFIG", "parent-config")
+    monkeypatch.setenv("COVERAGE_PROCESS_START", "parent.toml")
+    overrides: Final = {"COVERAGE_PROCESS_CONFIG": "child-config"} if explicit else {}
+    gateway: Final = Gateway(Mock(), "owner-key", "http://upstream")
+    with (
+        patch("integration._support.process.subprocess.Popen") as spawn,
+        patch("integration._support.process.httpx.Client") as client,
+        patch("integration._support.process.group_members", return_value=()),
+    ):
+        spawn.return_value.poll.return_value = None
+        client.return_value.__enter__.return_value.get.return_value.status_code = 200
+        with owned_proxy_process(gateway, tmp_path, overrides):
+            child: Final = spawn.call_args.kwargs["env"]
+            assert child["COVERAGE_PROCESS_CONFIG"] == ("child-config" if explicit else "")
+            assert child["COVERAGE_PROCESS_START"] == ""
+            assert child["LITELLM_MASTER_KEY"] == gateway.key
+    assert os.environ["COVERAGE_PROCESS_CONFIG"] == "parent-config"
+
+
 def test_changed_archive_is_rejected(tmp_path: Path) -> None:
     archive: Final = tmp_path / "reference.tar.gz"
     archive.write_bytes(b"changed reference")