TST/BUG: some buggy windows tests

[jreback]

xref #10630

• csv parsing then turning into a recarray causing segfaults, only when run with the entire parsing tests (e.g. test_parsing.py (2 tests) (DEPR: Deprecate as_recarray in read_csv #13373)
• in test_libsparse, the test_intersect is segfaulting, not really sure why.
• in test_ujson with small exponentials, only on win-64 with 2.7.

[jreback]

cc @Komnomnomnom
cc @mdmueller
cc @selasley

[jreback]

I don't think these are actually recent. Its also possible they only happen on my anaconda builds (these came to light when I turned on binstar). Though these ARE build with the correct visual studios, so not really sure what actually is the issue.

[chris-b1]

test_resample_group_info and test_series_groupby_nunique fail for me on python 2.7 on win64 as below (passes on Travis); I haven't dug in to see what's going on.

Attribute "dtype" are different
[left]:  int32
[right]: int64

[jreback]

@chris-b1 these are usually very easy changes. I have a windows ci, but don't always watch it.

if the tests does something like:

df = DataFrame({'A' : np.array(...)})

this will fail (say you are doing a resample or wahtever), because the np.array defaults to int32 on windows, and thus your comparison is int32 (not int64 which is what pandas makes everything if not explict).

Soln is np.array(...., dtype='int64')

[mroeschke]

Don't think this is relevant anymore. test_libsparse isn't tested anymore and 2.7 isn't supported.