import backend as F
import os
import unittest


def test_set_default_backend():
    default_dir = os.path.join(os.path.expanduser('~'), '.dgl_unit_test')
    F.set_default_backend(default_dir, 'pytorch')

    # make sure the config file was created
    assert os.path.exists(os.path.join(default_dir, 'config.json'))