add relevant dependency to the oai test workflow (microsoft#712)

* add oaitest dependency

* mock

* mock

* install

* get mock from unittest

* get mock from unitteset

Author: qingyun-wu

setup.py

@@ -46,7 +46,6 @@
             "pre-commit",
             "pytest-asyncio",
             "pytest>=6.1.1",
-            "mock",
         ],
         "blendsearch": ["flaml[blendsearch]"],
         "mathchat": ["sympy", "pydantic==1.10.9", "wolframalpha"],

test/agentchat/test_groupchat.py

@@ -1,5 +1,5 @@
 import pytest
-import mock
+from unittest import mock
 import builtins
 import autogen
 import json