def refcount():
"""Refcount maintains the global instance."""
genesis = resource.genesis
terminus = resource.terminus
called = {'genesis': False, 'terminus': False}
def decorated_genesis():
genesis()
called['genesis'] = True
def decorated_terminus():
terminus()
called['terminus'] = True
resource.genesis = decorated_genesis
resource.terminus = decorated_terminus
assert not called['genesis']
assert not called['terminus']
assert resource.reference_count == 0
resource.increment_refcount()
assert called['genesis']
assert not called['terminus']
assert resource.reference_count == 1
resource.increment_refcount()
assert not called['terminus']
assert resource.reference_count == 2
resource.decrement_refcount()
assert not called['terminus']
assert resource.reference_count == 1
resource.decrement_refcount()
assert called['terminus']
assert resource.reference_count == 0
def test_refcount():
"""Refcount maintains the global instance."""
genesis = resource.genesis
terminus = resource.terminus
called = {'genesis': False, 'terminus': False}
def decorated_genesis():
genesis()
called['genesis'] = True
def decorated_terminus():
terminus()
called['terminus'] = True
resource.genesis = decorated_genesis
resource.terminus = decorated_terminus
assert not called['genesis']
assert not called['terminus']
assert resource.reference_count == 0
resource.increment_refcount()
assert called['genesis']
assert not called['terminus']
assert resource.reference_count == 1
resource.increment_refcount()
assert not called['terminus']
assert resource.reference_count == 2
resource.decrement_refcount()
assert not called['terminus']
assert resource.reference_count == 1
resource.decrement_refcount()
assert called['terminus']
assert resource.reference_count == 0
def test_negative_refcount():
"""reference_count cannot be negative"""
with raises(RuntimeError):
resource.decrement_refcount()
def negative_refcount():
"""reference_count cannot be negative"""
with raises(RuntimeError):
resource.decrement_refcount()
