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bpo-38018: Increase code coverage for multiprocessing.shared_memory (GH-15662)

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Vinay Sharma 2019-09-09 22:18:55 +05:30 • committed by Davin Potts
parent 64c6ac74e2
commit d14e39c8d9
2 changed files with 25 additions and 0 deletions
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24
Lib/test/_test_multiprocessing.py
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@ -3719,6 +3719,30 @@ class _TestSharedMemory(BaseTestCase):
self.assertLess(same_sms.size, 20*sms.size) # Size was ignored.
same_sms.close()
# Creating Shared Memory Segment with -ve size
with self.assertRaises(ValueError):
shared_memory.SharedMemory(create=True, size=-2)
# Attaching Shared Memory Segment without a name
with self.assertRaises(ValueError):
shared_memory.SharedMemory(create=False)
# Test if shared memory segment is created properly,
# when _make_filename returns an existing shared memory segment name
with unittest.mock.patch(
'multiprocessing.shared_memory._make_filename') as mock_make_filename:
names = ['test01_fn', 'test02_fn']
mock_make_filename.side_effect = names
shm1 = shared_memory.SharedMemory(create=True, size=1)
self.addCleanup(shm1.unlink)
self.assertEqual(shm1.name, names[0])
mock_make_filename.side_effect = names
shm2 = shared_memory.SharedMemory(create=True, size=1)
self.addCleanup(shm2.unlink)
self.assertEqual(shm2.name, names[1])
if shared_memory._USE_POSIX:
# Posix Shared Memory can only be unlinked once. Here we
# test an implementation detail that is not observed across