Coverage for tests/unit_tests/managers/test_downloader.py: 100%

1""" 

2Tests of managers/downloader.py 

3""" 

4 

5import gc 

6import requests 

7from pytest import MonkeyPatch, raises 

8from apio.managers.downloader import FileDownloader 

9 

10 

11def test_failed_construction_safe_finalizer(monkeypatch: MonkeyPatch): 

12 """Tests that a FileDownloader whose construction failed, e.g. on a 

13 connection timeout, does not raise from its __del__ finalizer. It used 

14 to raise an AttributeError at garbage collection time, at an arbitrary 

15 point of the program (pytest reports it as an 'unraisable exception' 

16 error on an arbitrary test).""" 

17 

18 # -- Make requests.get raise a connect timeout, as when the server is 

19 # -- unreachable. We mock it to avoid a dependency on real networking. 

20 def mock_get(*_args, **_kwargs): 

21 raise requests.exceptions.ConnectTimeout("test timeout") 

22 

23 monkeypatch.setattr(requests, "get", mock_get) 

24 

25 # -- Construct a downloader. The construction should fail before the 

26 # -- request field is populated. 

27 with raises(requests.exceptions.ConnectTimeout): 

28 FileDownloader("http://localhost/no-such-file.tgz") 

29 

30 # -- Force the collection of the partially constructed object. With a 

31 # -- broken finalizer, pytest flags an 'unraisable exception' error here. 

32 gc.collect()