def test_gc_overlays(self):
root = ConfigDict()
overlay = root._make_overlay()
del overlay
import gc; gc.collect()
root._make_overlay() # This triggers the weakref-collect
self.assertEqual(len(root._overlays), 1)
def test_gc_overlays(self):
root = ConfigDict()
overlay = root._make_overlay()
del overlay
import gc
gc.collect()
root._make_overlay() # This triggers the weakref-collect
self.assertEqual(len(root._overlays), 1)
def test_overlay(self):
source = ConfigDict()
source['key'] = 'source'
intermediate = source._make_overlay()
overlay = intermediate._make_overlay()
# Overlay contains values from source
self.assertEqual(overlay['key'], 'source')
self.assertEqual(overlay.get('key'), 'source')
self.assertTrue('key' in overlay)
# Overlay is updated with source
source['key'] = 'source2'
self.assertEqual(source['key'], 'source2')
self.assertEqual(overlay['key'], 'source2')
# Overlay 'overlays' source (hence the name)
overlay['key'] = 'overlay'
self.assertEqual(source['key'], 'source2')
self.assertEqual(intermediate['key'], 'source2')
self.assertEqual(overlay['key'], 'overlay')
# Deleting an overlayed key restores the value from source
del overlay['key']
self.assertEqual(source['key'], 'source2')
self.assertEqual(overlay['key'], 'source2')
# Deleting a virtual key is actually not possible.
with self.assertRaises(KeyError):
del overlay['key']
# Deleting a key in the source also removes it from overlays.
del source['key']
self.assertTrue('key' not in overlay)
self.assertTrue('key' not in intermediate)
self.assertTrue('key' not in source)
# New keys in source are copied to overlay
source['key2'] = 'source'
self.assertEqual(source['key2'], 'source')
self.assertEqual(intermediate['key2'], 'source')
self.assertEqual(overlay['key2'], 'source')
# New keys in overlay do not change the source
overlay['key3'] = 'overlay'
self.assertEqual(overlay['key3'], 'overlay')
self.assertTrue('key3' not in intermediate)
self.assertTrue('key3' not in source)
# Setting the same key in the source does not affect the overlay
# because it already has this key.
source['key3'] = 'source'
self.assertEqual(source['key3'], 'source')
self.assertEqual(intermediate['key3'], 'source')
self.assertEqual(overlay['key3'], 'overlay')
# But as soon as the overlayed key is deleted, it gets the
# copy from the source
del overlay['key3']
self.assertEqual(source['key3'], 'source')
self.assertEqual(overlay['key3'], 'source')
def test_overlay(self):
source = ConfigDict()
source['key'] = 'source'
intermediate = source._make_overlay()
overlay = intermediate._make_overlay()
# Overlay contains values from source
self.assertEqual(overlay['key'], 'source')
self.assertEqual(overlay.get('key'), 'source')
self.assertTrue('key' in overlay)
# Overlay is updated with source
source['key'] = 'source2'
self.assertEqual(source['key'], 'source2')
self.assertEqual(overlay['key'], 'source2')
# Overlay 'overlays' source (hence the name)
overlay['key'] = 'overlay'
self.assertEqual(source['key'], 'source2')
self.assertEqual(intermediate['key'], 'source2')
self.assertEqual(overlay['key'], 'overlay')
# Deleting an overlayed key restores the value from source
del overlay['key']
self.assertEqual(source['key'], 'source2')
self.assertEqual(overlay['key'], 'source2')
# Deleting a virtual key is actually not possible.
with self.assertRaises(KeyError):
del overlay['key']
# Deleting a key in the source also removes it from overlays.
del source['key']
self.assertTrue('key' not in overlay)
self.assertTrue('key' not in intermediate)
self.assertTrue('key' not in source)
# New keys in source are copied to overlay
source['key2'] = 'source'
self.assertEqual(source['key2'], 'source')
self.assertEqual(intermediate['key2'], 'source')
self.assertEqual(overlay['key2'], 'source')
# New keys in overlay do not change the source
overlay['key3'] = 'overlay'
self.assertEqual(overlay['key3'], 'overlay')
self.assertTrue('key3' not in intermediate)
self.assertTrue('key3' not in source)
# Setting the same key in the source does not affect the overlay
# because it already has this key.
source['key3'] = 'source'
self.assertEqual(source['key3'], 'source')
self.assertEqual(intermediate['key3'], 'source')
self.assertEqual(overlay['key3'], 'overlay')
# But as soon as the overlayed key is deleted, it gets the
# copy from the source
del overlay['key3']
self.assertEqual(source['key3'], 'source')
self.assertEqual(overlay['key3'], 'source')
