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✅ Black serpent no upkeep on opponent phase

CategoryAbility
StatusPassing
Testtests/test_abilities_familiars.py::test_black_serpent_no_upkeep_on_opponent_phase

Black Serpent does NOT take upkeep damage at opponent's main phase start.

Preconditions​

  • Lane 0: P1's Black Serpent (098_1) — 0 damage.

Action​

  • Fire MAIN_PHASE_START event for P2 (opponent).
new_state = fire_event(
        state,
        GameEvent(
            event_type=EventType.MAIN_PHASE_START,
            source=None,
            target=None,
            value=None,
            side=Side.PLAYER_2,
            lane=None,
        ),
    )

    serpent_after = next(d for d in new_state.demons if d.unit_id == "098_1")

Expected Postconditions​

  • Black Serpent damage = 0 (upkeep only fires on owner's phase).

Assertions​

assert serpent_after.damage == 0, "Black Serpent should not take damage on opponent's main phase start."