TST: windows testing fixes

Author: jreback

pandas/tests/test_groupby.py

@@ -392,7 +392,7 @@ def test_grouper_creation_bug(self):
         assert_frame_equal(result, expected)
 
         # GH8866
-        s = Series(np.arange(8),
+        s = Series(np.arange(8,dtype='int64'),
                    index=pd.MultiIndex.from_product([list('ab'),
                                                      range(2),
                                                      date_range('20130101',periods=2)],

pandas/util/testing.py

@@ -172,6 +172,7 @@ def close(fignum=None):
 
 
 def _skip_if_32bit():
+    import nose
     import struct
     if struct.calcsize("P") * 8 < 64:
         raise nose.SkipTest("skipping for 32 bit")