def test_is_vacant(db, some_bldg_address, create_some_bldg):
got = is_vacant(some_bldg_address, db)
assert got is False
nothing_there = "g-b(67,37)-l4-b(6512,1298)"
got = is_vacant(nothing_there, db)
assert got is True
def test_is_vacant():
db = MagicMock()
db.buildings.find_one = MagicMock(return_value=None)
assert True == is_vacant("g-b(1,2)", db)
db.buildings.find_one.assert_called_once_with({'address': 'g-b(1,2)'})