def test_touch(self):
"""
Ensure that the touch method updates the timestamp for a referenced
item.
"""
self.assertTrue(hasattr(DataStore, 'touch'))
ds = DataStore()
timestamp = time.time()
ds._get_item = MagicMock(return_value=('bar', timestamp, timestamp))
ds._set_item = MagicMock()
ds.touch('foo')
self.assertEqual(1, ds._set_item.call_count)
args = ds._set_item.call_args_list[0][0]
self.assertEqual('foo', args[0])
self.assertEqual('bar', args[1][0])
self.assertEqual(args[1][1], timestamp)
self.assertTrue(args[1][2] > timestamp)
def test__setitem__existing_value(self):
"""
Check the DataStore base class has a __setitem__ method.
"""
self.assertTrue(hasattr(DataStore, '__setitem__'))
ds = DataStore()
val = 'some arbitrary yet meaningless value'
timestamp = time.time()
ds._get_item = MagicMock(return_value=(val, timestamp, 0.0))
ds._set_item = MagicMock()
ds['foo'] = val
self.assertEqual(1, ds._set_item.call_count)
call_args = ds._set_item.call_args[0]
self.assertEqual('foo', call_args[0])
self.assertIsInstance(call_args[1], tuple)
self.assertEqual(val, call_args[1][0])
self.assertTrue(timestamp < call_args[1][1])
self.assertEqual(0.0, call_args[1][2])
def test__setitem__new_value(self):
"""
Check the DataStore base class has a __setitem__ method.
"""
self.assertTrue(hasattr(DataStore, '__setitem__'))
ds = DataStore()
val = 'some arbitrary yet meaningless value'
ds._set_item = MagicMock()
def side_effect(*args, **kwargs):
raise KeyError()
ds._get_item = MagicMock(side_effect=side_effect)
ds['foo'] = val
self.assertEqual(1, ds._set_item.call_count)
call_args = ds._set_item.call_args[0]
self.assertEqual('foo', call_args[0])
self.assertIsInstance(call_args[1], tuple)
self.assertEqual(val, call_args[1][0])
self.assertIsInstance(call_args[1][1], float)
self.assertEqual(call_args[1][2], 0.0)