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""" Test for assert_deallocated context manager and gc utilities
"""
import gc
from scipy._lib._gcutils import set_gc_state, gc_state, assert_deallocated, ReferenceError
from nose.tools import assert_equal, raises
def test_set_gc_state():
gc_status = gc.isenabled()
try:
for state in (True, False):
gc.enable()
set_gc_state(state)
assert_equal(gc.isenabled(), state)
gc.disable()
set_gc_state(state)
assert_equal(gc.isenabled(), state)
finally:
if gc_status:
gc.enable()
def test_gc_state():
# Test gc_state context manager
gc_status = gc.isenabled()
try:
for pre_state in (True, False):
set_gc_state(pre_state)
for with_state in (True, False):
# Check the gc state is with_state in with block
with gc_state(with_state):
assert_equal(gc.isenabled(), with_state)
# And returns to previous state outside block
assert_equal(gc.isenabled(), pre_state)
# Even if the gc state is set explicitly within the block
with gc_state(with_state):
assert_equal(gc.isenabled(), with_state)
set_gc_state(not with_state)
assert_equal(gc.isenabled(), pre_state)
finally:
if gc_status:
gc.enable()
def test_assert_deallocated():
# Ordinary use
class C(object):
def __init__(self, arg0, arg1, name='myname'):
self.name = name
for gc_current in (True, False):
with gc_state(gc_current):
# We are deleting from with-block context, so that's OK
with assert_deallocated(C, 0, 2, 'another name') as c:
assert_equal(c.name, 'another name')
del c
# Or not using the thing in with-block context, also OK
with assert_deallocated(C, 0, 2, name='third name'):
pass
assert_equal(gc.isenabled(), gc_current)
@raises(ReferenceError)
def test_assert_deallocated_nodel():
class C(object):
pass
# Need to delete after using if in with-block context
with assert_deallocated(C) as c:
pass
@raises(ReferenceError)
def test_assert_deallocated_circular():
class C(object):
def __init__(self):
self._circular = self
# Circular reference, no automatic garbage collection
with assert_deallocated(C) as c:
del c
@raises(ReferenceError)
def test_assert_deallocated_circular2():
class C(object):
def __init__(self):
self._circular = self
# Still circular reference, no automatic garbage collection
with assert_deallocated(C):
pass
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