fix test

Author: jreback

pandas/tests/reshape/test_pivot.py

@@ -1226,7 +1226,9 @@ def test_crosstab_no_overlap(self):
         s2 = pd.Series([4, 5, 6], index=[4, 5, 6])
 
         actual = crosstab(s1, s2)
-        expected = pd.DataFrame(index=pd.Index([], dtype='int64'))
+        expected = pd.DataFrame(
+            columns=['col_0', 'row_0'],
+            index=pd.Index([], dtype='int64')).astype('int64')
 
         tm.assert_frame_equal(actual, expected)