Add tests for unpickling legacy datetime.datetime-indexed / DateRange objects

[wesm]

No description provided.

[adamklein]

@wesm, i have a legacy daterange unpickling to a datetimeindex, looks something like this:

        # extract the raw datetime data, turn into datetime64
        index_state = state[0]
        raw_data = index_state[0][4]
        raw_data = np.array(raw_data, dtype='M8[us]')
        new_state = raw_data.__reduce__()
        np.ndarray.__setstate__(self, new_state[2])

No matter what I try to do, at the end of the test suite I get a

*** Reference count error detected:
an attempt was made to deallocate 17 (O) ***

Any ideas?

[adamklein]

Nm, warning disappeared. No idea. Working!

[wesm]

Added a bunch of integration tests and kicked on this a bit. seems ok now