from pathlib import Path

from am_deduper.hashing import fast_hash, sha256


def test_fast_hash_same_content(tmp_path: Path):
    a = tmp_path / "a.bin"
    b = tmp_path / "b.bin"
    data = b"x" * 200_000
    a.write_bytes(data)
    b.write_bytes(data)
    assert fast_hash(a) == fast_hash(b)
    assert sha256(a) == sha256(b)


def test_fast_hash_uses_size(tmp_path: Path):
    a = tmp_path / "a.bin"
    b = tmp_path / "b.bin"
    a.write_bytes(b"x" * 100)
    b.write_bytes(b"x" * 101)
    assert fast_hash(a) != fast_hash(b)