diff --git a/unittests/test_high_level_api.py b/unittests/test_high_level_api.py
index 82c1a5caf0f0719b5946ecd6749b4079bb6794bc..e35dc678f7d0f44d1bb8fa763cf8dfc8225e3aee 100644
--- a/unittests/test_high_level_api.py
+++ b/unittests/test_high_level_api.py
@@ -322,6 +322,7 @@ def test_wrong_entity_for_file():
 
 
 def test_serialization():
+    # With ID
     r = db.Record(id=5, name="test", description="ok")
     r.add_property(name="v", value=15, datatype=db.INTEGER, unit="kpx",
                    importance="RECOMMENDED")
@@ -333,6 +334,22 @@ def test_serialization():
     for teststr in teststrs:
         assert teststr in text
 
+    serialized = convert_to_python_object(r).serialize()
+    assert serialized == {'role': 'Record',
+                          'name': 'test',
+                          'id': 5,
+                          'description': 'ok',
+                          'properties': {'v': 15},
+                          'parents': [],
+                          'metadata': {'v': {'unit': 'kpx',
+                                             'datatype': 'INTEGER',
+                                             'importance': 'RECOMMENDED'}}}
+
+    serialized_plain = convert_to_python_object(r).serialize(plain_json=True)
+    assert serialized_plain == {'id': 5, 'name': 'test', 'v': 15}
+
+    # Without ID
+
     r = db.Record(description="ok")
     r.add_property(name="v", value=15, datatype=db.INTEGER, unit="kpx",
                    importance="RECOMMENDED")
@@ -341,6 +358,18 @@ def test_serialization():
     assert "name" not in text
     assert "id" not in text
 
+    serialized = convert_to_python_object(r).serialize()
+    assert serialized == {'role': 'Record',
+                          'description': 'ok',
+                          'properties': {'v': 15},
+                          'parents': [],
+                          'metadata': {'v': {'unit': 'kpx',
+                                             'datatype': 'INTEGER',
+                                             'importance': 'RECOMMENDED'}}}
+
+    serialized_plain = convert_to_python_object(r).serialize(plain_json=True)
+    assert serialized_plain == {'id': None, 'name': None, 'v': 15}
+
 
 def test_files():
     # empty file: