"""Emit the broken-y-axis allreduce-vs-FSIM comparison plot.

Post-processes summary.csv (written by the latency sweep) into
comparison_mesh_vs_ring_vs_2DTorus_vs_theoretical_vs_fsim.png. Pure
plotting; reads the on-disk summary.csv (skips if the sweep has never run).
"""
from __future__ import annotations

from pathlib import Path

import pytest

from tests.sccl._allreduce_helpers import (
    _SWEEP_OUT_DIR,
    emit_comparison_fsim_plot,
)


def test_emit_comparison_fsim_plot():
    if not (_SWEEP_OUT_DIR / "summary.csv").exists():
        pytest.skip("summary.csv absent; run the latency sweep first")
    out = emit_comparison_fsim_plot()
    assert out is not None and Path(out).exists()