from pathlib import Path

from lightning_app.utilities.dependency_caching import get_hash


def test_get_hash(tmpdir):
    req_path = tmpdir / "requirements.txt"
    Path(req_path).touch()

    # empty requirements file
    assert get_hash(req_path) == "3345524abf6bbe1809449224b5972c41790b6cf2"

    # requirements file with one dependency
    req_path.write_text("lightning==1.0", encoding="utf-8")
    assert get_hash(req_path) == "6177677a74b5d256e331cb9e390af58106e20220"