diff --git a/Makefile b/Makefile
index d3580c8a..08844165 100644
--- a/Makefile
+++ b/Makefile
@@ -49,4 +49,7 @@ conda-upload:
 	./scripts/conda_upload.sh
 
 doc:
-	./scripts/gen_api_docs.sh
\ No newline at end of file
+	./scripts/gen_api_docs.sh
+
+upload-codecov:
+	codecov --file coverage.xml -t $(CODECOV_TOKEN)
\ No newline at end of file
diff --git a/examples/arena/run_arena.py b/examples/arena/run_arena.py
index 9eb26b7e..e880884c 100644
--- a/examples/arena/run_arena.py
+++ b/examples/arena/run_arena.py
@@ -26,6 +26,7 @@ def run_arena(
     seed=0,
     total_games: int = 10,
     max_game_onetime: int = 5,
+    use_tqdm: bool = True,
 ):
     env_wrappers = [RecordWinner]
     if render:
@@ -33,7 +34,7 @@ def run_arena(
 
         env_wrappers.append(TictactoeRender)
 
-    arena = make_arena("tictactoe_v3", env_wrappers=env_wrappers, use_tqdm=True)
+    arena = make_arena("tictactoe_v3", env_wrappers=env_wrappers, use_tqdm=use_tqdm)
 
     agent1 = LocalAgent("../selfplay/opponent_templates/random_opponent")
     agent2 = LocalAgent("../selfplay/opponent_templates/random_opponent")
@@ -52,4 +53,4 @@ def run_arena(
 
 if __name__ == "__main__":
     run_arena(render=False, parallel=True, seed=0, total_games=100, max_game_onetime=10)
-    # run_arena(render=True, parallel=True, seed=1, total_games=10, max_game_onetime=2)
+    # run_arena(render=False, parallel=False, seed=1, total_games=1, max_game_onetime=1,use_tqdm=False)
diff --git a/examples/snake/jidi_random_vs_openrl_random.py b/examples/snake/jidi_random_vs_openrl_random.py
index 364beb8e..37eb9e98 100644
--- a/examples/snake/jidi_random_vs_openrl_random.py
+++ b/examples/snake/jidi_random_vs_openrl_random.py
@@ -28,6 +28,7 @@ def run_arena(
     seed=0,
     total_games: int = 10,
     max_game_onetime: int = 5,
+    use_tqdm: bool = True,
 ):
     env_wrappers = [RecordWinner]
 
@@ -36,7 +37,7 @@ def run_arena(
         f"snakes_{player_num}v{player_num}",
         env_wrappers=env_wrappers,
         render=render,
-        use_tqdm=True,
+        use_tqdm=use_tqdm,
     )
 
     agent1 = JiDiAgent("./submissions/random_agent", player_num=player_num)
@@ -55,4 +56,12 @@ def run_arena(
 
 
 if __name__ == "__main__":
-    run_arena(render=False, parallel=True, seed=0, total_games=100, max_game_onetime=5)
+    # run_arena(render=False, parallel=True, seed=0, total_games=100, max_game_onetime=5)
+    run_arena(
+        render=False,
+        parallel=False,
+        seed=0,
+        total_games=1,
+        max_game_onetime=1,
+        use_tqdm=False,
+    )
diff --git a/openrl/envs/PettingZoo/__init__.py b/openrl/envs/PettingZoo/__init__.py
index b1384f81..6b29092f 100644
--- a/openrl/envs/PettingZoo/__init__.py
+++ b/openrl/envs/PettingZoo/__init__.py
@@ -35,6 +35,7 @@ def PettingZoo_make(id, render_mode, disable_env_checker, **kwargs):
         from pettingzoo.classic import tictactoe_v3
 
         env = tictactoe_v3.env(render_mode=render_mode)
+
     else:
         raise NotImplementedError
     return env
diff --git a/openrl/envs/snake/snake_pettingzoo.py b/openrl/envs/snake/snake_pettingzoo.py
index 136bb420..fb34358a 100644
--- a/openrl/envs/snake/snake_pettingzoo.py
+++ b/openrl/envs/snake/snake_pettingzoo.py
@@ -83,7 +83,8 @@ def action_space(self, agent):
         return deepcopy(self._action_spaces[agent])
 
     def observe(self, agent):
-        return self.raw_obs[self.agent_name_to_slice[agent]]
+        obs = self.raw_obs[self.agent_name_to_slice[agent]]
+        return obs
 
     def reset(
         self,
diff --git a/openrl/selfplay/opponents/random_opponent.py b/openrl/selfplay/opponents/random_opponent.py
index b3ff8569..1f396c34 100644
--- a/openrl/selfplay/opponents/random_opponent.py
+++ b/openrl/selfplay/opponents/random_opponent.py
@@ -41,7 +41,11 @@ def _sample_random_action(
     ):
         action_space = self.env.action_space(player_name)
         if isinstance(action_space, list):
+            if not isinstance(observation, list):
+                observation = [observation]
+
             action = []
+
             for obs, space in zip(observation, action_space):
                 mask = obs.get("action_mask", None)
                 action.append(space.sample(mask))
diff --git a/openrl/supports/opendata/utils/opendata_utils.py b/openrl/supports/opendata/utils/opendata_utils.py
index 7b387d70..4cae62df 100644
--- a/openrl/supports/opendata/utils/opendata_utils.py
+++ b/openrl/supports/opendata/utils/opendata_utils.py
@@ -48,6 +48,7 @@ def data_server_wrapper(fp):
 
 def load_dataset(data_path: str, split: str):
     from datasets import load_from_disk
+
     if Path(data_path).exists():
         dataset = load_from_disk("{}/{}".format(data_path, split))
     elif "data_server:" in data_path:
diff --git a/setup.py b/setup.py
index f00d23fc..494e4c4c 100644
--- a/setup.py
+++ b/setup.py
@@ -69,6 +69,7 @@ def get_extra_requires() -> dict:
         "retro": ["gym-retro"],
         "super_mario": ["gym-super-mario-bros"],
     }
+    req["test"].extend(req["selfplay"])
     return req
 
 
diff --git a/tests/test_arena/test_reproducibility.py b/tests/test_arena/test_reproducibility.py
new file mode 100644
index 00000000..0d186ab0
--- /dev/null
+++ b/tests/test_arena/test_reproducibility.py
@@ -0,0 +1,72 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+# Copyright 2023 The OpenRL Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+""""""
+import os
+import sys
+
+import pytest
+
+from openrl.arena import make_arena
+from openrl.arena.agents.local_agent import LocalAgent
+from openrl.envs.wrappers.pettingzoo_wrappers import RecordWinner
+
+
+def run_arena(
+    render: bool = False,
+    parallel: bool = True,
+    seed=0,
+    total_games: int = 10,
+    max_game_onetime: int = 5,
+):
+    env_wrappers = [RecordWinner]
+    if render:
+        from examples.selfplay.tictactoe_utils.tictactoe_render import TictactoeRender
+
+        env_wrappers.append(TictactoeRender)
+
+    arena = make_arena("tictactoe_v3", env_wrappers=env_wrappers, use_tqdm=False)
+
+    agent1 = LocalAgent("./examples/selfplay/opponent_templates/random_opponent")
+    agent2 = LocalAgent("./examples/selfplay/opponent_templates/random_opponent")
+
+    arena.reset(
+        agents={"agent1": agent1, "agent2": agent2},
+        total_games=total_games,
+        max_game_onetime=max_game_onetime,
+        seed=seed,
+    )
+    result = arena.run(parallel=parallel)
+    arena.close()
+    print(result)
+    return result
+
+
+@pytest.mark.unittest
+def test_seed():
+    seed = 0
+    test_time = 3
+    pre_result = None
+    for parallel in [False, True]:
+        for i in range(test_time):
+            result = run_arena(seed=seed, parallel=parallel, total_games=20)
+            if pre_result is not None:
+                assert pre_result == result, f"parallel={parallel}, seed={seed}"
+            pre_result = result
+
+
+if __name__ == "__main__":
+    sys.exit(pytest.main(["-sv", os.path.basename(__file__)]))
diff --git a/tests/test_supports/test_opendata/test_opendata.py b/tests/test_supports/test_opendata/test_opendata.py
index 4a0fe64f..44807906 100644
--- a/tests/test_supports/test_opendata/test_opendata.py
+++ b/tests/test_supports/test_opendata/test_opendata.py
@@ -30,7 +30,5 @@ def test_data_abs_path():
     assert data_abs_path(data_path) == data_path
 
 
-
-
 if __name__ == "__main__":
     sys.exit(pytest.main(["-sv", os.path.basename(__file__)]))