from __future__ import annotations

import difflib


def _ratio(a: str, b: str) -> int:
    return int(difflib.SequenceMatcher(a=a, b=b).ratio() * 100)


def test_similarity_thresholds_behave_monotonically() -> None:
    """Similarity ratios should increase for more similar strings."""

    a = "backend developer"
    b1 = "backend dev"
    b2 = "data engineer"

    assert _ratio(a, b1) > _ratio(a, b2)