def test_results():
res = Results()
res.append("hello")
res.add_error("wibble", "notaurl", "out of cheese")
assert "notaurl" in repr(res)
assert "hello" in repr(res)
assert "out of cheese" in repr(res)
def test_empty_retry():
f = Results()
dl = Downloader()
dl.retry(f)