From 740cafe6b14cdc324d6fc4688d2cc2b972e34df1 Mon Sep 17 00:00:00 2001
From: Matt Roeschke <emailformattr@gmail.com>
Date: Thu, 15 Dec 2016 21:18:02 -0800
Subject: [PATCH] TST: to_json keeps column info with empty dataframe (#7445)

Move test
---
 pandas/io/tests/json/test_pandas.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pandas/io/tests/json/test_pandas.py b/pandas/io/tests/json/test_pandas.py
index e6e6f33669e17..d7f903153fdae 100644
--- a/pandas/io/tests/json/test_pandas.py
+++ b/pandas/io/tests/json/test_pandas.py
@@ -388,6 +388,10 @@ def test_frame_empty(self):
         self.assertFalse(df._is_mixed_type)
         assert_frame_equal(read_json(df.to_json(), dtype=dict(df.dtypes)), df,
                            check_index_type=False)
+        # GH 7445
+        result = pd.DataFrame({'test': []}, index=[]).to_json(orient='columns')
+        expected = '{"test":{}}'
+        tm.assert_equal(result, expected)
 
     def test_frame_empty_mixedtype(self):
         # mixed type