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"""Test reload support.
Reload support requires two things. One is that if module is loaded that
already exists in sys.modules then it is reused. And two, if a reload fails the
pre-existing module is left in a sane state.
"""
import imp
import sys
import types
import unittest
import importlib
from .. import support
class ReloadTests(unittest.TestCase):
name = '_temp'
def load_module(self, mapping):
return importlib._PyFileLoader(self.name, mapping[self.name], False)
def fake_mtime(self, fxn):
"""Fake mtime to always be higher than expected."""
return lambda name: fxn(name) + 1
def test_module_reuse(self):
with support.create_modules(self.name) as mapping:
loader = self.load_module(mapping)
module = loader.load_module(self.name)
module_id = id(module)
module_dict_id = id(module.__dict__)
with open(mapping[self.name], 'w') as file:
file.write("testing_var = 42\n")
# For filesystems where the mtime is only to a second granularity,
# everything that has happened above can be too fast;
# force an mtime on the source that is guaranteed to be different
# than the original mtime.
loader.source_mtime = self.fake_mtime(loader.source_mtime)
module = loader.load_module(self.name)
self.assert_('testing_var' in module.__dict__,
"'testing_var' not in "
"{0}".format(list(module.__dict__.keys())))
self.assertEqual(module, sys.modules[self.name])
self.assertEqual(id(module), module_id)
self.assertEqual(id(module.__dict__), module_dict_id)
def test_bad_reload(self):
# A failed reload should leave the original module intact.
attributes = ('__file__', '__path__', '__package__')
value = '<test>'
with support.create_modules(self.name) as mapping:
orig_module = imp.new_module(self.name)
for attr in attributes:
setattr(orig_module, attr, value)
with open(mapping[self.name], 'w') as file:
file.write('+++ bad syntax +++')
loader = self.load_module(mapping)
self.assertRaises(SyntaxError, loader.load_module, self.name)
for attr in attributes:
self.assertEqual(getattr(orig_module, attr), value)
def test_main():
from test.support import run_unittest
run_unittest(ReloadTests)
if __name__ == '__main__':
test_main()
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