import os
from mock import patch

from dvc.external_repo import external_repo
from dvc.scm.git import Git


def test_external_repo(erepo):
    url = erepo.root_dir
    # We will share cache dir, to fetch version file
    cache_dir = erepo.dvc.cache.local.cache_dir

    with patch.object(Git, "clone", wraps=Git.clone) as mock:
        with external_repo(url, cache_dir=cache_dir) as repo:
            with repo.open(os.path.join(repo.root_dir, "version")) as fd:
                assert fd.read() == "master"

        with external_repo(url, rev="branch", cache_dir=cache_dir) as repo:
            with repo.open(os.path.join(repo.root_dir, "version")) as fd:
                assert fd.read() == "branch"

        # Check cache_dir is unset
        with external_repo(url) as repo:
            assert repo.cache.local.cache_dir.startswith(
                repo.root_dir + os.sep
            )

        assert mock.call_count == 1