agent serialization (#4642)

tests/unit_tests/agents/test_serialization.py

@@ -0,0 +1,19 @@
+from pathlib import Path
+from tempfile import TemporaryDirectory
+
+from langchain.agents.agent_types import AgentType
+from langchain.agents.initialize import initialize_agent, load_agent
+from langchain.llms.fake import FakeListLLM
+
+
+def test_mrkl_serialization() -> None:
+    agent = initialize_agent(
+        [],
+        FakeListLLM(responses=[]),
+        agent=AgentType.ZERO_SHOT_REACT_DESCRIPTION,
+        verbose=True,
+    )
+    with TemporaryDirectory() as tempdir:
+        file = Path(tempdir) / "agent.json"
+        agent.save_agent(file)
+        load_agent(file)