Test that date
First clean up from any other tests.
>>> import os, datetime
>>> assert os.system('rm -rf /tmp/test_ds/') == 0

>>> from olpc.datastore import DataStore
>>> from olpc.datastore import backingstore, model
>>> ds = DataStore()
>>> ds.registerBackend(backingstore.FileBackingStore)

>>> assert ds.mount("/tmp/test_ds")

>>> t1 = datetime.datetime(1995, 1, 1)
>>> t2 = datetime.datetime(2000, 1, 1)
>>> t3 = datetime.datetime(2005, 1, 1)

>>> a = ds.create(dict(title="Content A", author="Bob", ctime=t1.isoformat()), '')
>>> b = ds.create(dict(title="Content B", author="Alice", ctime=t2.isoformat()), '')
>>> c = ds.create(dict(title="Content V", author="Clare", ctime=t3.isoformat()), '')        

>>> ds.complete_indexing()


Scan for ranges

>>> result, count = ds.find({'ctime' : {'start' : t1.isoformat(), 'end' : t3.isoformat() }})
>>> assert count == 3


>>> result, count = ds.find({'ctime' : {'start' : t1.isoformat(), 'end' : t2.isoformat() }})
>>> assert count == 2

>>> result, count = ds.find({'ctime' : {'start' : t2.isoformat(), 'end' : t3.isoformat() }})
>>> assert count == 2

>>> result, count = ds.find({'ctime' : {'start' : t1.isoformat(), 'end' : t1.isoformat() }})
>>> assert count == 1


>>> ds.stop()
>>> del ds
>>> assert os.system('rm -rf /tmp/test_ds/') == 0