"""Runs the Node-based streaming-render segmenter suite (tests/streaming/*.test.mjs).

Covers the pure incremental-render segmenter (static/js/streamingSegmenter.js):
unit boundaries plus a streaming-invariant fuzz that feeds a markdown corpus in
token-by-token and asserts the freeze/tail split always matches a single full
render. Pure JS — no DOM, no extra dependencies. Skipped when node is
unavailable, mirroring tests/test_markdown_rendering_js.py.

The renderer's DOM behavior (streamingRenderer.js) is exercised against a running
app, not here, consistent with how this project tests browser-coupled code.
"""

import shutil
import subprocess
from pathlib import Path

import pytest

_REPO = Path(__file__).resolve().parent.parent
_HAS_NODE = shutil.which("node") is not None


@pytest.mark.skipif(not _HAS_NODE, reason="node binary not on PATH")
def test_streaming_segmenter_suite():
    test_files = sorted(str(p) for p in (_REPO / "tests" / "streaming").glob("*.test.mjs"))
    assert test_files, "no streaming test files found"

    result = subprocess.run(
        ["node", "--test", *test_files],
        cwd=_REPO,
        capture_output=True,
        timeout=180,
        text=True,
    )
    if result.returncode != 0:
        raise AssertionError(
            f"node --test failed:\nSTDOUT:\n{result.stdout}\nSTDERR:\n{result.stderr}"
        )