Three fixes that close the remaining structural sources of CI flakes
after PR #13363.
## 1. Per-test reset of module-level singletons and ContextVars
Python modules are singletons per process, and pytest-xdist workers are
long-lived. Module-level dicts/sets and ContextVars persist across tests
on the same worker. A test that sets state in `tools.approval._session_approved`
and doesn't explicitly clear it leaks that state to every subsequent test
on the same worker.
New `_reset_module_state` autouse fixture in `tests/conftest.py` clears:
- tools.approval: _session_approved, _session_yolo, _permanent_approved,
_pending, _gateway_queues, _gateway_notify_cbs, _approval_session_key
- tools.interrupt: _interrupted_threads
- gateway.session_context: 10 session/cron ContextVars (reset to _UNSET)
- tools.env_passthrough: _allowed_env_vars_var (reset to empty set)
- tools.credential_files: _registered_files_var (reset to empty dict)
- tools.file_tools: _read_tracker, _file_ops_cache
This was the single biggest remaining class of CI flakes.
`test_command_guards::test_warn_session_approved` and
`test_combined_cli_session_approves_both` were failing 12/15 recent main
runs specifically because `_session_approved` carried approvals from a
prior test's session into these tests' `"default"` session lookup.
## 2. Unset platform allowlist env vars in hermetic fixture
`TELEGRAM_ALLOWED_USERS`, `DISCORD_ALLOWED_USERS`, and 20 other
`*_ALLOWED_USERS` / `*_ALLOW_ALL_USERS` vars are now unset per-test in
the same place credential env vars already are. These aren't credentials
but they change gateway auth behavior; if set from any source (user
shell, leaky test, CI env) they flake button-authorization tests.
Fixes three `test_telegram_approval_buttons` tests that were failing
across recent runs of the full gateway directory.
## 3. Two specific tests with module-level captured state
- `test_signal::TestSignalPhoneRedaction`: `agent.redact._REDACT_ENABLED`
is captured at module import from `HERMES_REDACT_SECRETS`, not read
per-call. `monkeypatch.delenv` at test time is too late. Added
`monkeypatch.setattr("agent.redact._REDACT_ENABLED", True)` per
skill xdist-cross-test-pollution Pattern 5.
- `test_internal_event_bypass_pairing::test_non_internal_event_without_user_triggers_pairing`:
`gateway.pairing.PAIRING_DIR` is captured at module import from
HERMES_HOME, so per-test HERMES_HOME redirection in conftest doesn't
retroactively move it. Test now monkeypatches PAIRING_DIR directly to
its tmp_path, preventing rate-limit state from prior xdist workers
from letting the pairing send-call be suppressed.
## Validation
- tests/tools/: 3494 pass (0 fail) including test_command_guards
- tests/gateway/: 3504 pass (0 fail) across repeat runs
- tests/agent/ + tests/hermes_cli/ + tests/run_agent/ + tests/tools/:
8371 pass, 37 skipped, 0 fail — full suite across directories
No production code changed.
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