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test_reload_libraries.py
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test_reload_libraries.py
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import functools
import pathlib
import random
from unittest.mock import MagicMock
from unittest.mock import patch
import pytest
import cauldron
from cauldron import runner
def _mock_reload_module(history: dict, path: str, library_directory: str):
"""Mocked version of the runner.__init__._reload_module function."""
output = {"path": path, "library_directory": library_directory}
if path not in history and random.random() > 0.5:
history[path] = output
raise ValueError("Faking that this did not go well for the first time.")
history[path] = output
return output
@patch("cauldron.runner._reload_module")
def test_reload(reload_module: MagicMock):
"""Should reload as expected."""
history = {}
reload_module.side_effect = functools.partial(_mock_reload_module, history)
library_directory = pathlib.Path(cauldron.__file__).resolve().parent
output = runner.reload_libraries([None, str(library_directory)])
me = pathlib.Path(__file__).resolve()
root = pathlib.Path(cauldron.__file__).resolve()
keys = list(history.keys())
assert keys.index(str(me)) < keys.index(str(root)), """
Expecting deeper hierarchy to be reloaded first.
"""
assert output, "Expect a non-empty list returned."
@patch("cauldron.runner._reload_module")
def test_reload_failure(reload_module: MagicMock):
"""Should raise RuntimeError if imports fail after many retries."""
reload_module.side_effect = ValueError("Nope")
library_directory = pathlib.Path(cauldron.__file__).resolve().parent
with pytest.raises(RuntimeError):
runner.reload_libraries([None, str(library_directory)])