tests/test_fallback.py

import sys; sys.path.insert(0, "src")
from buddy_fusion.fallback import fallback_genome, fuse_fallback
from buddy_fusion.genome import Genome, ARCHETYPES


def test_roll_is_deterministic_for_seed():
    assert fallback_genome(7) == fallback_genome(7)


def test_roll_varies_by_seed():
    assert fallback_genome(1) != fallback_genome(2)


def test_roll_always_has_valid_archetype():
    for s in range(20):
        assert fallback_genome(s).archetype in ARCHETYPES


def test_fuse_is_deterministic():
    a, b = fallback_genome(1), fallback_genome(2)
    assert fuse_fallback(a, b, 5) == fuse_fallback(a, b, 5)


def test_fuse_inherits_archetype_and_mutates():
    a, b = fallback_genome(1), fallback_genome(2)
    child = fuse_fallback(a, b, 5)
    assert child.archetype in (a.archetype, b.archetype)  # body plan from a parent
    assert child.traits  # mutation trait present
    assert child.story   # lineage flavor present