From 1a1ca4ddd0cf5ebc806f214510af419e783222b1 Mon Sep 17 00:00:00 2001
From: gfyoung <gfyoung17+GitHub@gmail.com>
Date: Fri, 25 Oct 2019 15:46:44 +0000
Subject: [PATCH] TST: Add test for nested JSON normalization

Closes https://github.com/pandas-dev/pandas/issues/21537
---
 pandas/tests/io/json/test_normalize.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/pandas/tests/io/json/test_normalize.py b/pandas/tests/io/json/test_normalize.py
index 3ceddfc3c1db4..aa4f522ef45ba 100644
--- a/pandas/tests/io/json/test_normalize.py
+++ b/pandas/tests/io/json/test_normalize.py
@@ -457,6 +457,14 @@ def test_max_level_with_records_path(self, max_level, expected):
         expected_df = DataFrame(data=expected, columns=result.columns.values)
         tm.assert_equal(expected_df, result)
 
+    def test_nested_flattening_consistent(self):
+        # see gh-21537
+        df1 = json_normalize([{"A": {"B": 1}}])
+        df2 = json_normalize({"dummy": [{"A": {"B": 1}}]}, "dummy")
+
+        # They should be the same.
+        tm.assert_frame_equal(df1, df2)
+
 
 class TestNestedToRecord:
     def test_flat_stays_flat(self):