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"""Basic test of the frozen module (source is in Python/frozen.c)."""

# The Python/frozen.c source code contains a marshalled Python module

# and therefore depends on the marshal format as well as the bytecode

# format. If those formats have been changed then frozen.c needs to be

# updated.

# The test_importlib also tests this module but because those tests

# are much more complicated, it might be unclear why they are failing.

# Invalid marshalled data in frozen.c could case the interpreter to

# crash when __hello__ is imported.

import importlib.machinery

import sys

import unittest

from test.support import captured_stdout, import_helper

class TestFrozen(unittest.TestCase):

def test_frozen(self):

name = '__hello__'

if name in sys.modules:

del sys.modules[name]

with import_helper.frozen_modules():

import __hello__

with captured_stdout() as out:

__hello__.main()

self.assertEqual(out.getvalue(), 'Hello world!\n')

def test_frozen_submodule_in_unfrozen_package(self):

with import_helper.CleanImport('__phello__', '__phello__.spam'):

with import_helper.frozen_modules(enabled=False):

import __phello__

with import_helper.frozen_modules(enabled=True):

import __phello__.spam as spam

self.assertIs(spam, __phello__.spam)

self.assertIsNot(__phello__.__spec__.loader,

importlib.machinery.FrozenImporter)

self.assertIs(spam.__spec__.loader,

importlib.machinery.FrozenImporter)

def test_unfrozen_submodule_in_frozen_package(self):

with import_helper.CleanImport('__phello__', '__phello__.spam'):

with import_helper.frozen_modules(enabled=True):

import __phello__

with import_helper.frozen_modules(enabled=False):

import __phello__.spam as spam

self.assertIs(spam, __phello__.spam)

self.assertIs(__phello__.__spec__.loader,

importlib.machinery.FrozenImporter)

self.assertIsNot(spam.__spec__.loader,

importlib.machinery.FrozenImporter)

if __name__ == '__main__':

unittest.main()

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