# Copyright (c) 2025-2026, RTE (https://www.rte-france.com)
# This Source Code Form is subject to the terms of the Mozilla Public License, version 2.0.
# If a copy of the Mozilla Public License, version 2.0 was not distributed with this file,
# you can obtain one at http://mozilla.org/MPL/2.0/.
# SPDX-License-Identifier: MPL-2.0
"""Unit tests for the Co-Study4Grid overflow-graph overlay injector and
the dynamic ``/results/pdf/{filename}`` route that serves it.
The overlay is plain string substitution by design (no HTML parser
dependency) — exercising it is therefore deterministic and fast.
"""
from __future__ import annotations
import re
from pathlib import Path
import pytest
from fastapi.testclient import TestClient
from expert_backend.main import app
from expert_backend.services.overflow_overlay import inject_overlay
_BASE_HTML = (
'x'
''
)
# ---------------------------------------------------------------------
# inject_overlay — pure-string injector
# ---------------------------------------------------------------------
class TestInjectOverlay:
def test_injects_style_and_script_before_closing_body(self) -> None:
out = inject_overlay(_BASE_HTML)
# The original body content must still be there.
assert '' in out
# Both blocks must appear AND be positioned before