How to use test_garbage_collection method in autotest

Best Python code snippet using autotest_python

common.py

Source:common.py

1""" Test utilities2"""3# Authors: Deepak Surti, Ioannis Tziakos4# Copyright (c) 2015, Enthought, Inc.5# License: BSD Style.6import contextlib7import gc8import unittest9import weakref10@contextlib.contextmanager11def restore_gc_state():12    """Ensure that gc state is restored on exit of the with statement."""13    originally_enabled = gc.isenabled()14    try:15        yield16    finally:17        if originally_enabled:18            gc.enable()19        else:20            gc.disable()21class TestGarbageCollection(unittest.TestCase):22    """ This is a base class to use when testing garbage collection.23        See: tvtk.tests.test_garbage_collection24             mayavi.tests.test_garbage_collection25    """26    def check_object_garbage_collected(self, obj_create_fn, obj_close_fn=None):27        """ Call this from a test function to test for garbage collection28            passing the following parameters:29            obj_create_fn: function30                A function with no parameters that creates the object31            obj_close_fn: function32                A function of 1 parameter which is the object created by33                obj_create_fn, to handling the object closing, if any.34        """35        # given36        object_collected = []37        object_weakref = None38        def object_collected_callback(weakref):39            object_collected.append(True)40        def do():41            obj = obj_create_fn()42            reference = weakref.ref(obj, object_collected_callback)43            if obj_close_fn:44                obj_close_fn(obj)45            return reference46        # when47        with restore_gc_state():48            gc.disable()49            object_weakref = do()50        # The object should have been collected.51        self.assertTrue(object_collected[0])...

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