def test_backtrack(temp_cache):
s = TextFilesSource("*.py")
s2 = s.persist()
s3 = store.backtrack(s2)
assert s3 == s
def test_persist_with_nonnumeric_ttl_raises_error(temp_cache):
s = TextFilesSource("*.py")
with pytest.raises(ValueError, match="User-provided ttl was a string"):
s.persist(ttl='a string')