backend/tests/conftest.py

"""Configuracion compartida dos tests.

Os modulos do backend importanse en plano (``from services.calculos import ...``),
asi que engadimos ``backend/`` ao sys.path para poder lanzar pytest dende a raiz
do repo ou dende backend/.
"""

import sys
from pathlib import Path

import pytest

BACKEND_DIR = Path(__file__).resolve().parent.parent
if str(BACKEND_DIR) not in sys.path:
    sys.path.insert(0, str(BACKEND_DIR))


@pytest.fixture
def muestreo_determinista(monkeypatch):
    """Quita o azar de sample_from_ranked para poder comprobar a orde do ranking.

    Substituindo random.sample/shuffle por operacions deterministas, a estratexia
    devolve os primeiros ``limit`` elementos respectando a orde calculada.
    """
    import services.calculos as calculos

    monkeypatch.setattr(calculos.random, "sample", lambda poboacion, k: list(poboacion)[:k])
    monkeypatch.setattr(calculos.random, "shuffle", lambda secuencia: None)
    return None


@pytest.fixture
def peli():
    # Construtor de dicts candidatos. Como fixture e non import para evitar
    # chocar cun paquete `tests` de terceiros que hai en site-packages.
    def _build(movie_id="m", genres="Drama", rating_count=100, rating_mean=4.0):
        return {
            "movie_id": movie_id,
            "movieId": movie_id,
            "genres": genres,
            "rating_count": rating_count,
            "rating_mean": rating_mean,
        }
    return _build