TST: windows dtype test fix for tests_indexing/test_imethods_with_dups

Author: jreback

pandas/tests/test_indexing.py

@@ -339,7 +339,7 @@ def test_imethods_with_dups(self):
         # GH6493
         # iat/iloc with dups
 
-        s = Series(range(5), index=[1,1,2,2,3])
+        s = Series(range(5), index=[1,1,2,2,3], dtype='int64')
         result = s.iloc[2]
         self.assertEqual(result,2)
         result = s.iat[2]