cpython/Lib/test/test_imp.py

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import imp
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import thread
import unittest
from test import test_support
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class LockTests(unittest.TestCase):
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"""Very basic test of import lock functions."""
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def verify_lock_state(self, expected):
self.failUnlessEqual(imp.lock_held(), expected,
"expected imp.lock_held() to be %r" % expected)
def testLock(self):
LOOPS = 50
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# The import lock may already be held, e.g. if the test suite is run
# via "import test.autotest".
lock_held_at_start = imp.lock_held()
self.verify_lock_state(lock_held_at_start)
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for i in range(LOOPS):
imp.acquire_lock()
self.verify_lock_state(True)
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for i in range(LOOPS):
imp.release_lock()
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# The original state should be restored now.
self.verify_lock_state(lock_held_at_start)
if not lock_held_at_start:
try:
imp.release_lock()
except RuntimeError:
pass
else:
self.fail("release_lock() without lock should raise "
"RuntimeError")
def test_main():
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test_support.run_unittest(
LockTests,
)
if __name__ == "__main__":
test_main()