add test for group.to_dict() with one member

tests/ceod/model/test_group.py

@@ -38,8 +38,8 @@ def test_group_members(ldap_group, ldap_srv, g_admin):
         group.remove_member('member1')
 
 
-def test_group_to_dict(simple_group):
-    group = simple_group
+def test_group_to_dict(ldap_group, ldap_user):
+    group = ldap_group
 
     expected = {
         'cn': group.cn,
@@ -48,3 +48,11 @@ def test_group_to_dict(simple_group):
         'members': [],
     }
     assert group.to_dict() == expected
+
+    group.add_member(ldap_user.uid)
+    expected['members'].append({
+        'uid': ldap_user.uid,
+        'cn': ldap_user.cn,
+        'program': ldap_user.program,
+    })
+    assert group.to_dict() == expected