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import pytest
from snakeoil.test import mixins


class TestDemandLoadTargets(mixins.PythonNamespaceWalker):

    target_namespace = "snakeoil"
    ignore_all_import_failures = False

    @pytest.fixture(autouse=True)
    def _setup(self):
        self._failures = []
        yield
        msg = "\n".join(sorted(f"{target}: error {e}" for target, e in self._failures))
        assert not self._failures, "bad demandload targets:\n" + msg

    def test_demandload_targets(self):
        for x in self.walk_namespace(
            self.target_namespace, ignore_failed_imports=self.ignore_all_import_failures
        ):
            self.check_space(x)

    def check_space(self, mod):
        for attr in dir(mod):
            try:
                obj = getattr(mod, attr)
                # force __getattribute__ to fire
                getattr(obj, "__class__", None)
            except ImportError as ie:
                # hit one.
                self._failures.append((f"{mod.__name__}: target {attr}", ie))