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626 lines
22 KiB
Python
626 lines
22 KiB
Python
import importlib
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from importlib import abc
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from importlib import machinery
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import imp
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import inspect
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import io
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import marshal
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import os
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import sys
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import unittest
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from unittest import mock
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from . import util
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##### Inheritance ##############################################################
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class InheritanceTests:
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"""Test that the specified class is a subclass/superclass of the expected
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classes."""
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subclasses = []
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superclasses = []
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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assert self.subclasses or self.superclasses, self.__class__
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self.__test = getattr(abc, self.__class__.__name__)
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def test_subclasses(self):
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# Test that the expected subclasses inherit.
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for subclass in self.subclasses:
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self.assertTrue(issubclass(subclass, self.__test),
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"{0} is not a subclass of {1}".format(subclass, self.__test))
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def test_superclasses(self):
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# Test that the class inherits from the expected superclasses.
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for superclass in self.superclasses:
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self.assertTrue(issubclass(self.__test, superclass),
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"{0} is not a superclass of {1}".format(superclass, self.__test))
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class MetaPathFinder(InheritanceTests, unittest.TestCase):
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superclasses = [abc.Finder]
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subclasses = [machinery.BuiltinImporter, machinery.FrozenImporter,
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machinery.PathFinder, machinery.WindowsRegistryFinder]
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class PathEntryFinder(InheritanceTests, unittest.TestCase):
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superclasses = [abc.Finder]
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subclasses = [machinery.FileFinder]
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class ResourceLoader(InheritanceTests, unittest.TestCase):
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superclasses = [abc.Loader]
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class InspectLoader(InheritanceTests, unittest.TestCase):
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superclasses = [abc.Loader]
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subclasses = [machinery.BuiltinImporter,
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machinery.FrozenImporter, machinery.ExtensionFileLoader]
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class ExecutionLoader(InheritanceTests, unittest.TestCase):
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superclasses = [abc.InspectLoader]
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class FileLoader(InheritanceTests, unittest.TestCase):
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superclasses = [abc.ResourceLoader, abc.ExecutionLoader]
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subclasses = [machinery.SourceFileLoader, machinery.SourcelessFileLoader]
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class SourceLoader(InheritanceTests, unittest.TestCase):
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superclasses = [abc.ResourceLoader, abc.ExecutionLoader]
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subclasses = [machinery.SourceFileLoader]
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##### Default return values ####################################################
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class MetaPathFinderSubclass(abc.MetaPathFinder):
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def find_module(self, fullname, path):
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return super().find_module(fullname, path)
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class MetaPathFinderDefaultsTests(unittest.TestCase):
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ins = MetaPathFinderSubclass()
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def test_find_module(self):
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# Default should return None.
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self.assertIsNone(self.ins.find_module('something', None))
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def test_invalidate_caches(self):
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# Calling the method is a no-op.
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self.ins.invalidate_caches()
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class PathEntryFinderSubclass(abc.PathEntryFinder):
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def find_loader(self, fullname):
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return super().find_loader(fullname)
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class PathEntryFinderDefaultsTests(unittest.TestCase):
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ins = PathEntryFinderSubclass()
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def test_find_loader(self):
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self.assertEqual((None, []), self.ins.find_loader('something'))
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def find_module(self):
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self.assertEqual(None, self.ins.find_module('something'))
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def test_invalidate_caches(self):
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# Should be a no-op.
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self.ins.invalidate_caches()
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class LoaderSubclass(abc.Loader):
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def load_module(self, fullname):
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return super().load_module(fullname)
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class LoaderDefaultsTests(unittest.TestCase):
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ins = LoaderSubclass()
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def test_load_module(self):
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with self.assertRaises(ImportError):
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self.ins.load_module('something')
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def test_module_repr(self):
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mod = imp.new_module('blah')
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with self.assertRaises(NotImplementedError):
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self.ins.module_repr(mod)
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original_repr = repr(mod)
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mod.__loader__ = self.ins
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# Should still return a proper repr.
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self.assertTrue(repr(mod))
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class ResourceLoaderSubclass(LoaderSubclass, abc.ResourceLoader):
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def get_data(self, path):
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return super().get_data(path)
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class ResourceLoaderDefaultsTests(unittest.TestCase):
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ins = ResourceLoaderSubclass()
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def test_get_data(self):
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with self.assertRaises(IOError):
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self.ins.get_data('/some/path')
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class InspectLoaderSubclass(LoaderSubclass, abc.InspectLoader):
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def is_package(self, fullname):
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return super().is_package(fullname)
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def get_source(self, fullname):
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return super().get_source(fullname)
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class InspectLoaderDefaultsTests(unittest.TestCase):
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ins = InspectLoaderSubclass()
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def test_is_package(self):
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with self.assertRaises(ImportError):
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self.ins.is_package('blah')
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def test_get_source(self):
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with self.assertRaises(ImportError):
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self.ins.get_source('blah')
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class ExecutionLoaderSubclass(InspectLoaderSubclass, abc.ExecutionLoader):
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def get_filename(self, fullname):
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return super().get_filename(fullname)
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class ExecutionLoaderDefaultsTests(unittest.TestCase):
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ins = ExecutionLoaderSubclass()
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def test_get_filename(self):
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with self.assertRaises(ImportError):
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self.ins.get_filename('blah')
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##### InspectLoader concrete methods ###########################################
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class InspectLoaderSourceToCodeTests(unittest.TestCase):
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def source_to_module(self, data, path=None):
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"""Help with source_to_code() tests."""
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module = imp.new_module('blah')
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loader = InspectLoaderSubclass()
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if path is None:
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code = loader.source_to_code(data)
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else:
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code = loader.source_to_code(data, path)
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exec(code, module.__dict__)
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return module
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def test_source_to_code_source(self):
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# Since compile() can handle strings, so should source_to_code().
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source = 'attr = 42'
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module = self.source_to_module(source)
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self.assertTrue(hasattr(module, 'attr'))
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self.assertEqual(module.attr, 42)
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def test_source_to_code_bytes(self):
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# Since compile() can handle bytes, so should source_to_code().
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source = b'attr = 42'
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module = self.source_to_module(source)
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self.assertTrue(hasattr(module, 'attr'))
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self.assertEqual(module.attr, 42)
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def test_source_to_code_path(self):
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# Specifying a path should set it for the code object.
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path = 'path/to/somewhere'
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loader = InspectLoaderSubclass()
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code = loader.source_to_code('', path)
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self.assertEqual(code.co_filename, path)
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def test_source_to_code_no_path(self):
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# Not setting a path should still work and be set to <string> since that
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# is a pre-existing practice as a default to compile().
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loader = InspectLoaderSubclass()
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code = loader.source_to_code('')
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self.assertEqual(code.co_filename, '<string>')
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class InspectLoaderGetCodeTests(unittest.TestCase):
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def test_get_code(self):
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# Test success.
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module = imp.new_module('blah')
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with mock.patch.object(InspectLoaderSubclass, 'get_source') as mocked:
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mocked.return_value = 'attr = 42'
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loader = InspectLoaderSubclass()
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code = loader.get_code('blah')
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exec(code, module.__dict__)
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self.assertEqual(module.attr, 42)
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def test_get_code_source_is_None(self):
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# If get_source() is None then this should be None.
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with mock.patch.object(InspectLoaderSubclass, 'get_source') as mocked:
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mocked.return_value = None
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loader = InspectLoaderSubclass()
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code = loader.get_code('blah')
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self.assertIsNone(code)
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def test_get_code_source_not_found(self):
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# If there is no source then there is no code object.
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loader = InspectLoaderSubclass()
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with self.assertRaises(ImportError):
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loader.get_code('blah')
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##### ExecutionLoader concrete methods #########################################
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class ExecutionLoaderGetCodeTests(unittest.TestCase):
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def mock_methods(self, *, get_source=False, get_filename=False):
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source_mock_context, filename_mock_context = None, None
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if get_source:
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source_mock_context = mock.patch.object(ExecutionLoaderSubclass,
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'get_source')
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if get_filename:
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filename_mock_context = mock.patch.object(ExecutionLoaderSubclass,
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'get_filename')
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return source_mock_context, filename_mock_context
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def test_get_code(self):
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path = 'blah.py'
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source_mock_context, filename_mock_context = self.mock_methods(
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get_source=True, get_filename=True)
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with source_mock_context as source_mock, filename_mock_context as name_mock:
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source_mock.return_value = 'attr = 42'
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name_mock.return_value = path
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loader = ExecutionLoaderSubclass()
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code = loader.get_code('blah')
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self.assertEqual(code.co_filename, path)
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module = imp.new_module('blah')
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exec(code, module.__dict__)
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self.assertEqual(module.attr, 42)
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def test_get_code_source_is_None(self):
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# If get_source() is None then this should be None.
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source_mock_context, _ = self.mock_methods(get_source=True)
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with source_mock_context as mocked:
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mocked.return_value = None
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loader = ExecutionLoaderSubclass()
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code = loader.get_code('blah')
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self.assertIsNone(code)
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def test_get_code_source_not_found(self):
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# If there is no source then there is no code object.
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loader = ExecutionLoaderSubclass()
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with self.assertRaises(ImportError):
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loader.get_code('blah')
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def test_get_code_no_path(self):
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# If get_filename() raises ImportError then simply skip setting the path
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# on the code object.
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source_mock_context, filename_mock_context = self.mock_methods(
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get_source=True, get_filename=True)
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with source_mock_context as source_mock, filename_mock_context as name_mock:
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source_mock.return_value = 'attr = 42'
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name_mock.side_effect = ImportError
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loader = ExecutionLoaderSubclass()
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code = loader.get_code('blah')
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self.assertEqual(code.co_filename, '<string>')
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module = imp.new_module('blah')
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exec(code, module.__dict__)
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self.assertEqual(module.attr, 42)
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##### SourceLoader concrete methods ############################################
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class SourceOnlyLoaderMock(abc.SourceLoader):
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# Globals that should be defined for all modules.
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source = (b"_ = '::'.join([__name__, __file__, __cached__, __package__, "
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b"repr(__loader__)])")
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def __init__(self, path):
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self.path = path
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def get_data(self, path):
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if path != self.path:
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raise IOError
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return self.source
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def get_filename(self, fullname):
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return self.path
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def module_repr(self, module):
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return '<module>'
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class SourceLoaderMock(SourceOnlyLoaderMock):
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source_mtime = 1
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def __init__(self, path, magic=imp.get_magic()):
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super().__init__(path)
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self.bytecode_path = imp.cache_from_source(self.path)
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self.source_size = len(self.source)
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data = bytearray(magic)
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data.extend(importlib._w_long(self.source_mtime))
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data.extend(importlib._w_long(self.source_size))
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code_object = compile(self.source, self.path, 'exec',
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dont_inherit=True)
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data.extend(marshal.dumps(code_object))
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self.bytecode = bytes(data)
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self.written = {}
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def get_data(self, path):
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if path == self.path:
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return super().get_data(path)
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elif path == self.bytecode_path:
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return self.bytecode
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else:
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raise OSError
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def path_stats(self, path):
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if path != self.path:
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raise IOError
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return {'mtime': self.source_mtime, 'size': self.source_size}
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def set_data(self, path, data):
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self.written[path] = bytes(data)
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return path == self.bytecode_path
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class SourceLoaderTestHarness(unittest.TestCase):
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def setUp(self, *, is_package=True, **kwargs):
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self.package = 'pkg'
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if is_package:
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self.path = os.path.join(self.package, '__init__.py')
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self.name = self.package
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else:
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module_name = 'mod'
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self.path = os.path.join(self.package, '.'.join(['mod', 'py']))
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self.name = '.'.join([self.package, module_name])
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self.cached = imp.cache_from_source(self.path)
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self.loader = self.loader_mock(self.path, **kwargs)
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def verify_module(self, module):
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self.assertEqual(module.__name__, self.name)
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self.assertEqual(module.__file__, self.path)
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self.assertEqual(module.__cached__, self.cached)
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self.assertEqual(module.__package__, self.package)
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self.assertEqual(module.__loader__, self.loader)
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values = module._.split('::')
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self.assertEqual(values[0], self.name)
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self.assertEqual(values[1], self.path)
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self.assertEqual(values[2], self.cached)
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self.assertEqual(values[3], self.package)
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self.assertEqual(values[4], repr(self.loader))
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def verify_code(self, code_object):
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module = imp.new_module(self.name)
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module.__file__ = self.path
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module.__cached__ = self.cached
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module.__package__ = self.package
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module.__loader__ = self.loader
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module.__path__ = []
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exec(code_object, module.__dict__)
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self.verify_module(module)
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class SourceOnlyLoaderTests(SourceLoaderTestHarness):
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"""Test importlib.abc.SourceLoader for source-only loading.
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Reload testing is subsumed by the tests for
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importlib.util.module_for_loader.
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"""
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loader_mock = SourceOnlyLoaderMock
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def test_get_source(self):
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# Verify the source code is returned as a string.
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# If an OSError is raised by get_data then raise ImportError.
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expected_source = self.loader.source.decode('utf-8')
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self.assertEqual(self.loader.get_source(self.name), expected_source)
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def raise_OSError(path):
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raise OSError
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self.loader.get_data = raise_OSError
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with self.assertRaises(ImportError) as cm:
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self.loader.get_source(self.name)
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self.assertEqual(cm.exception.name, self.name)
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def test_is_package(self):
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# Properly detect when loading a package.
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self.setUp(is_package=False)
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self.assertFalse(self.loader.is_package(self.name))
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self.setUp(is_package=True)
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self.assertTrue(self.loader.is_package(self.name))
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self.assertFalse(self.loader.is_package(self.name + '.__init__'))
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def test_get_code(self):
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# Verify the code object is created.
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code_object = self.loader.get_code(self.name)
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self.verify_code(code_object)
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def test_source_to_code(self):
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# Verify the compiled code object.
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code = self.loader.source_to_code(self.loader.source, self.path)
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self.verify_code(code)
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def test_load_module(self):
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# Loading a module should set __name__, __loader__, __package__,
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# __path__ (for packages), __file__, and __cached__.
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# The module should also be put into sys.modules.
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with util.uncache(self.name):
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module = self.loader.load_module(self.name)
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self.verify_module(module)
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self.assertEqual(module.__path__, [os.path.dirname(self.path)])
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self.assertIn(self.name, sys.modules)
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def test_package_settings(self):
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# __package__ needs to be set, while __path__ is set on if the module
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# is a package.
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# Testing the values for a package are covered by test_load_module.
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self.setUp(is_package=False)
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with util.uncache(self.name):
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module = self.loader.load_module(self.name)
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self.verify_module(module)
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self.assertTrue(not hasattr(module, '__path__'))
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def test_get_source_encoding(self):
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# Source is considered encoded in UTF-8 by default unless otherwise
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# specified by an encoding line.
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source = "_ = 'ü'"
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self.loader.source = source.encode('utf-8')
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returned_source = self.loader.get_source(self.name)
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self.assertEqual(returned_source, source)
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source = "# coding: latin-1\n_ = ü"
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self.loader.source = source.encode('latin-1')
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returned_source = self.loader.get_source(self.name)
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self.assertEqual(returned_source, source)
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@unittest.skipIf(sys.dont_write_bytecode, "sys.dont_write_bytecode is true")
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class SourceLoaderBytecodeTests(SourceLoaderTestHarness):
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"""Test importlib.abc.SourceLoader's use of bytecode.
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Source-only testing handled by SourceOnlyLoaderTests.
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"""
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loader_mock = SourceLoaderMock
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def verify_code(self, code_object, *, bytecode_written=False):
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super().verify_code(code_object)
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if bytecode_written:
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self.assertIn(self.cached, self.loader.written)
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data = bytearray(imp.get_magic())
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data.extend(importlib._w_long(self.loader.source_mtime))
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data.extend(importlib._w_long(self.loader.source_size))
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data.extend(marshal.dumps(code_object))
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self.assertEqual(self.loader.written[self.cached], bytes(data))
|
|
|
|
def test_code_with_everything(self):
|
|
# When everything should work.
|
|
code_object = self.loader.get_code(self.name)
|
|
self.verify_code(code_object)
|
|
|
|
def test_no_bytecode(self):
|
|
# If no bytecode exists then move on to the source.
|
|
self.loader.bytecode_path = "<does not exist>"
|
|
# Sanity check
|
|
with self.assertRaises(OSError):
|
|
bytecode_path = imp.cache_from_source(self.path)
|
|
self.loader.get_data(bytecode_path)
|
|
code_object = self.loader.get_code(self.name)
|
|
self.verify_code(code_object, bytecode_written=True)
|
|
|
|
def test_code_bad_timestamp(self):
|
|
# Bytecode is only used when the timestamp matches the source EXACTLY.
|
|
for source_mtime in (0, 2):
|
|
assert source_mtime != self.loader.source_mtime
|
|
original = self.loader.source_mtime
|
|
self.loader.source_mtime = source_mtime
|
|
# If bytecode is used then EOFError would be raised by marshal.
|
|
self.loader.bytecode = self.loader.bytecode[8:]
|
|
code_object = self.loader.get_code(self.name)
|
|
self.verify_code(code_object, bytecode_written=True)
|
|
self.loader.source_mtime = original
|
|
|
|
def test_code_bad_magic(self):
|
|
# Skip over bytecode with a bad magic number.
|
|
self.setUp(magic=b'0000')
|
|
# If bytecode is used then EOFError would be raised by marshal.
|
|
self.loader.bytecode = self.loader.bytecode[8:]
|
|
code_object = self.loader.get_code(self.name)
|
|
self.verify_code(code_object, bytecode_written=True)
|
|
|
|
def test_dont_write_bytecode(self):
|
|
# Bytecode is not written if sys.dont_write_bytecode is true.
|
|
# Can assume it is false already thanks to the skipIf class decorator.
|
|
try:
|
|
sys.dont_write_bytecode = True
|
|
self.loader.bytecode_path = "<does not exist>"
|
|
code_object = self.loader.get_code(self.name)
|
|
self.assertNotIn(self.cached, self.loader.written)
|
|
finally:
|
|
sys.dont_write_bytecode = False
|
|
|
|
def test_no_set_data(self):
|
|
# If set_data is not defined, one can still read bytecode.
|
|
self.setUp(magic=b'0000')
|
|
original_set_data = self.loader.__class__.set_data
|
|
try:
|
|
del self.loader.__class__.set_data
|
|
code_object = self.loader.get_code(self.name)
|
|
self.verify_code(code_object)
|
|
finally:
|
|
self.loader.__class__.set_data = original_set_data
|
|
|
|
def test_set_data_raises_exceptions(self):
|
|
# Raising NotImplementedError or OSError is okay for set_data.
|
|
def raise_exception(exc):
|
|
def closure(*args, **kwargs):
|
|
raise exc
|
|
return closure
|
|
|
|
self.setUp(magic=b'0000')
|
|
self.loader.set_data = raise_exception(NotImplementedError)
|
|
code_object = self.loader.get_code(self.name)
|
|
self.verify_code(code_object)
|
|
|
|
|
|
class SourceLoaderGetSourceTests(unittest.TestCase):
|
|
|
|
"""Tests for importlib.abc.SourceLoader.get_source()."""
|
|
|
|
def test_default_encoding(self):
|
|
# Should have no problems with UTF-8 text.
|
|
name = 'mod'
|
|
mock = SourceOnlyLoaderMock('mod.file')
|
|
source = 'x = "ü"'
|
|
mock.source = source.encode('utf-8')
|
|
returned_source = mock.get_source(name)
|
|
self.assertEqual(returned_source, source)
|
|
|
|
def test_decoded_source(self):
|
|
# Decoding should work.
|
|
name = 'mod'
|
|
mock = SourceOnlyLoaderMock("mod.file")
|
|
source = "# coding: Latin-1\nx='ü'"
|
|
assert source.encode('latin-1') != source.encode('utf-8')
|
|
mock.source = source.encode('latin-1')
|
|
returned_source = mock.get_source(name)
|
|
self.assertEqual(returned_source, source)
|
|
|
|
def test_universal_newlines(self):
|
|
# PEP 302 says universal newlines should be used.
|
|
name = 'mod'
|
|
mock = SourceOnlyLoaderMock('mod.file')
|
|
source = "x = 42\r\ny = -13\r\n"
|
|
mock.source = source.encode('utf-8')
|
|
expect = io.IncrementalNewlineDecoder(None, True).decode(source)
|
|
self.assertEqual(mock.get_source(name), expect)
|
|
|
|
|
|
|
|
if __name__ == '__main__':
|
|
unittest.main()
|