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from importlib import abc
from importlib import machinery
import inspect
import unittest
class InheritanceTests:
"""Test that the specified class is a subclass/superclass of the expected
classes."""
subclasses = []
superclasses = []
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
assert self.subclasses or self.superclasses, self.__class__
self.__test = getattr(abc, self.__class__.__name__)
def test_subclasses(self):
# Test that the expected subclasses inherit.
for subclass in self.subclasses:
self.assertTrue(issubclass(subclass, self.__test),
"{0} is not a subclass of {1}".format(subclass, self.__test))
def test_superclasses(self):
# Test that the class inherits from the expected superclasses.
for superclass in self.superclasses:
self.assertTrue(issubclass(self.__test, superclass),
"{0} is not a superclass of {1}".format(superclass, self.__test))
class MetaPathFinder(InheritanceTests, unittest.TestCase):
superclasses = [abc.Finder]
subclasses = [machinery.BuiltinImporter, machinery.FrozenImporter,
machinery.PathFinder, machinery.WindowsRegistryFinder]
class PathEntryFinder(InheritanceTests, unittest.TestCase):
superclasses = [abc.Finder]
subclasses = [machinery.FileFinder]
class Loader(InheritanceTests, unittest.TestCase):
subclasses = [abc.PyLoader]
class ResourceLoader(InheritanceTests, unittest.TestCase):
superclasses = [abc.Loader]
class InspectLoader(InheritanceTests, unittest.TestCase):
superclasses = [abc.Loader]
subclasses = [abc.PyLoader, machinery.BuiltinImporter,
machinery.FrozenImporter, machinery.ExtensionFileLoader]
class ExecutionLoader(InheritanceTests, unittest.TestCase):
superclasses = [abc.InspectLoader]
subclasses = [abc.PyLoader]
class FileLoader(InheritanceTests, unittest.TestCase):
superclasses = [abc.ResourceLoader, abc.ExecutionLoader]
subclasses = [machinery.SourceFileLoader, machinery.SourcelessFileLoader]
class SourceLoader(InheritanceTests, unittest.TestCase):
superclasses = [abc.ResourceLoader, abc.ExecutionLoader]
subclasses = [machinery.SourceFileLoader]
class PyLoader(InheritanceTests, unittest.TestCase):
superclasses = [abc.Loader, abc.ResourceLoader, abc.ExecutionLoader]
class PyPycLoader(InheritanceTests, unittest.TestCase):
superclasses = [abc.PyLoader]
def test_main():
from test.support import run_unittest
classes = []
for class_ in globals().values():
if (inspect.isclass(class_) and
issubclass(class_, unittest.TestCase) and
issubclass(class_, InheritanceTests)):
classes.append(class_)
run_unittest(*classes)
if __name__ == '__main__':
test_main()
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