tests/test_balance.py

"""Balance floor regression: the greedy bot must keep the difficulty
gradient alive. Small seed counts — these guard against catastrophic
balance breaks, not 1% drift."""

from balance.sim import simulate, standard_decks, winrate
from scrypt.data import load_content
from scrypt.engine.combat import Result


def test_simulator_is_deterministic():
    content = load_content()
    deck = standard_decks(content)["vanilla"]
    side = [content.card("bit")] * 10
    script = content.encounters["first_blood"]["script"]
    a = simulate(deck, side, script, seed=11)
    b = simulate(deck, side, script, seed=11)
    assert a.result is b.result and a.turn == b.turn


def test_first_encounter_is_winnable_floor():
    content = load_content()
    deck = standard_decks(content)["vanilla"]
    r = winrate(content, deck, "first_blood", seeds=30)
    assert r["winrate"] >= 0.7, f"first encounter too hard for the floor bot: {r}"
    assert r["stall"] == 0, "fights must end"


def test_final_encounter_is_a_wall_for_the_floor_bot():
    content = load_content()
    deck = standard_decks(content)["vanilla"]
    r = winrate(content, deck, "scheduled_doom", seeds=30)
    assert r["winrate"] <= 0.6, f"finale too easy: {r}"


def test_every_fight_terminates():
    content = load_content()
    side = [content.card("bit")] * 10
    for deck in standard_decks(content).values():
        for enc in content.encounters.values():
            state = simulate(deck, side, enc["script"], seed=3)
            assert state.result is not Result.UNDECIDED