Test added for GH12541

Author: Giacomo Ferroni

pandas/tests/test_window.py

@@ -207,6 +207,20 @@ def f():
             'A', 'ra', 'std'), ('B', 'rb', 'mean'), ('B', 'rb', 'std')])
         tm.assert_frame_equal(result, expected, check_like=True)
 
+    def test_count_nonnumeric_types(self):
+        # GH12541
+        df_inf = DataFrame({'x': [1, 2, 3], 'y': [1., 2., np.Inf]})
+        df_date = DataFrame({'x': [1, 2, 3], 'y': pd.date_range('20130101',periods=3)})
+        df_inf_date = DataFrame({'x': [1, 2, 3], 'y': [1., 2., np.Inf], 
+                                 'z': pd.date_range('20170101',periods=3)})
+
+        expected_1 = DataFrame([[1,1],[2,2],[2,2]], columns=['x','y'], dtype=float)
+        expected_2 = DataFrame([[1,1,1],[2,2,2],[2,2,2]], columns=['x','y','z'], dtype=float)
+
+        self.assert_frame_equal(df_inf.rolling(window=2).count(), expected_1)
+        self.assert_frame_equal(df_date.rolling(window=2).count(), expected_1)
+        self.assert_frame_equal(df_inf_date.rolling(window=2).count(), expected_2)
+
     def test_window_with_args(self):
         tm._skip_if_no_scipy()