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import importlib
from importlib import machinery
from .. import abc
from .. import util
from . import util as builtin_util
import sys
import types
import unittest
class LoaderTests(abc.LoaderTests):
"""Test load_module() for built-in modules."""
verification = {'__name__': 'errno', '__package__': '',
'__loader__': machinery.BuiltinImporter}
def verify(self, module):
"""Verify that the module matches against what it should have."""
self.assertIsInstance(module, types.ModuleType)
for attr, value in self.verification.items():
self.assertEqual(getattr(module, attr), value)
self.assertIn(module.__name__, sys.modules)
load_module = staticmethod(lambda name:
machinery.BuiltinImporter.load_module(name))
def test_module(self):
# Common case.
with util.uncache(builtin_util.NAME):
module = self.load_module(builtin_util.NAME)
self.verify(module)
# Built-in modules cannot be a package.
test_package = test_lacking_parent = None
# No way to force an import failure.
test_state_after_failure = None
def test_module_reuse(self):
# Test that the same module is used in a reload.
with util.uncache(builtin_util.NAME):
module1 = self.load_module(builtin_util.NAME)
module2 = self.load_module(builtin_util.NAME)
self.assertIs(module1, module2)
def test_unloadable(self):
name = 'dssdsdfff'
assert name not in sys.builtin_module_names
with self.assertRaises(ImportError) as cm:
self.load_module(name)
self.assertEqual(cm.exception.name, name)
def test_already_imported(self):
# Using the name of a module already imported but not a built-in should
# still fail.
assert hasattr(importlib, '__file__') # Not a built-in.
with self.assertRaises(ImportError) as cm:
self.load_module('importlib')
self.assertEqual(cm.exception.name, 'importlib')
class InspectLoaderTests(unittest.TestCase):
"""Tests for InspectLoader methods for BuiltinImporter."""
def test_get_code(self):
# There is no code object.
result = machinery.BuiltinImporter.get_code(builtin_util.NAME)
self.assertIsNone(result)
def test_get_source(self):
# There is no source.
result = machinery.BuiltinImporter.get_source(builtin_util.NAME)
self.assertIsNone(result)
def test_is_package(self):
# Cannot be a package.
result = machinery.BuiltinImporter.is_package(builtin_util.NAME)
self.assertTrue(not result)
def test_not_builtin(self):
# Modules not built-in should raise ImportError.
for meth_name in ('get_code', 'get_source', 'is_package'):
method = getattr(machinery.BuiltinImporter, meth_name)
with self.assertRaises(ImportError) as cm:
method(builtin_util.BAD_NAME)
self.assertRaises(builtin_util.BAD_NAME)
def test_main():
from test.support import run_unittest
run_unittest(LoaderTests, InspectLoaderTests)
if __name__ == '__main__':
test_main()