list_deser should transform str into list of str.

Author: rohe

src/oidcmsg/message.py

@@ -871,8 +871,11 @@ def list_deserializer(val, sformat="urlencoded"):
             return val.split(" ")
         elif isinstance(val, list) and len(val) == 1:
             return val[0].split(" ")
-    else:
-        return val
+    elif sformat == "dict":
+        if isinstance(val, str):
+            val = [val]
+
+    return val
 
 
 def sp_sep_list_serializer(vals, sformat="urlencoded", lev=0):

tests/test_06_oidc.py

@@ -1614,4 +1614,11 @@ def test_ID_Token_space_in_id():
         "iat": 1632495659
     })
 
-    assert idt["aud"] == "client_ifCttPphtLxtPWd20602 ^.+/"
+    assert idt["aud"] == ["client_ifCttPphtLxtPWd20602 ^.+/"]
+
+    idt = IdToken(**{'at_hash': 'rgMbiR-Dj11dQjxhCyLkOw', 'sub': 'user-subject-1234531',
+                     'aud': 'client_dVCwIQuSKklinFP70742;#__$',
+                     'iss': 'https://www.certification.openid.net/test/a/idpy/', 'exp': 1632639462,
+                     'nonce': 'hUT3RhSooxC9CilrD8al6bGx', 'iat': 1632639162})
+
+    assert idt["aud"] == ["client_dVCwIQuSKklinFP70742;#__$"]