Add test for the df.info() case (GH14298)

Author: jorisvandenbossche

pandas/tests/frame/test_repr_info.py

@@ -405,3 +405,13 @@ def memory_usage(f):
 
         # high upper bound
         self.assertTrue(memory_usage(unstacked) - memory_usage(df) < 2000)
+
+    def test_info_categorical(self):
+        # GH14298
+        idx = pd.CategoricalIndex(['a', 'b'])
+        df = pd.DataFrame(np.zeros((2, 2)), index=idx, columns=idx)
+
+        import sys
+        sys.stdout = StringIO()
+        df.info()
+        sys.stdout = sys.__stdout__