diff --git a/test/test_son.py b/test/test_son.py
index 5730da256..20bff8c85 100644
--- a/test/test_son.py
+++ b/test/test_son.py
@@ -67,6 +67,15 @@ class TestSON(unittest.TestCase):
                                      ('mike', 'awesome'),
                                      ('hello', 'world'))))
 
+        # Embedded SON.
+        d4 = SON([('blah', {'foo': SON()})])
+        self.assertEqual(d4, {'blah': {'foo': {}}})
+        self.assertEqual(d4, {'blah': {'foo': SON()}})
+        self.assertNotEqual(d4, {'blah': {'foo': []}})
+
+        # Original data unaffected.
+        self.assertEqual(SON, d4['blah']['foo'].__class__)
+
     def test_to_dict(self):
         a1 = SON()
         b2 = SON([("blah", SON())])
@@ -81,6 +90,9 @@ class TestSON(unittest.TestCase):
         self.assertEqual(dict, c3.to_dict()["blah"][0].__class__)
         self.assertEqual(dict, d4.to_dict()["blah"]["foo"].__class__)
 
+        # Original data unaffected.
+        self.assertEqual(SON, d4['blah']['foo'].__class__)
+
     def test_pickle(self):
 
         simple_son = SON([])