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import unittest
import contextlib
import pathlib
from test.support import os_helper
from importlib import resources
from importlib.resources import abc
from importlib.resources.abc import TraversableResources, ResourceReader
from . import util
class SimpleLoader:
"""
A simple loader that only implements a resource reader.
"""
def __init__(self, reader: ResourceReader):
self.reader = reader
def get_resource_reader(self, package):
return self.reader
class MagicResources(TraversableResources):
"""
Magically returns the resources at path.
"""
def __init__(self, path: pathlib.Path):
self.path = path
def files(self):
return self.path
class CustomTraversableResourcesTests(unittest.TestCase):
def setUp(self):
self.fixtures = contextlib.ExitStack()
self.addCleanup(self.fixtures.close)
def test_custom_loader(self):
temp_dir = pathlib.Path(self.fixtures.enter_context(os_helper.temp_dir()))
loader = SimpleLoader(MagicResources(temp_dir))
pkg = util.create_package_from_loader(loader)
files = resources.files(pkg)
assert isinstance(files, abc.Traversable)
assert list(files.iterdir()) == []
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