diff --git a/test/testcases/test_http_api/conftest.py b/test/testcases/test_http_api/conftest.py
index d8515082e..f4838646a 100644
--- a/test/testcases/test_http_api/conftest.py
+++ b/test/testcases/test_http_api/conftest.py
@@ -14,12 +14,14 @@
 #  limitations under the License.
 #
 
+from time import sleep
+
 import pytest
 from common import (
-    add_chunk,
+    batch_add_chunks,
+    batch_create_chat_assistants,
     batch_create_datasets,
     bulk_upload_documents,
-    create_chat_assistant,
     delete_chat_assistants,
     delete_datasets,
     delete_session_with_chat_assistants,
@@ -103,14 +105,14 @@ def clear_chat_assistants(request, api_key):
 
 @pytest.fixture(scope="function")
 def clear_session_with_chat_assistants(request, api_key, add_chat_assistants):
-    _, _, chat_assistant_ids = add_chat_assistants
-
     def cleanup():
         for chat_assistant_id in chat_assistant_ids:
             delete_session_with_chat_assistants(api_key, chat_assistant_id)
 
     request.addfinalizer(cleanup)
 
+    _, _, chat_assistant_ids = add_chat_assistants
+
 
 @pytest.fixture(scope="class")
 def add_dataset(request, api_key):
@@ -145,16 +147,8 @@ def add_chunks(api_key, add_document):
     dataset_id, document_id = add_document
     parse_documents(api_key, dataset_id, {"document_ids": [document_id]})
     condition(api_key, dataset_id)
-
-    chunk_ids = []
-    for i in range(4):
-        res = add_chunk(api_key, dataset_id, document_id, {"content": f"chunk test {i}"})
-        chunk_ids.append(res["data"]["chunk"]["id"])
-
-    # issues/6487
-    from time import sleep
-
-    sleep(1)
+    chunk_ids = batch_add_chunks(api_key, dataset_id, document_id, 4)
+    sleep(1)  # issues/6487
     return dataset_id, document_id, chunk_ids
 
 
@@ -168,10 +162,4 @@ def add_chat_assistants(request, api_key, add_document):
     dataset_id, document_id = add_document
     parse_documents(api_key, dataset_id, {"document_ids": [document_id]})
     condition(api_key, dataset_id)
-
-    chat_assistant_ids = []
-    for i in range(5):
-        res = create_chat_assistant(api_key, {"name": f"test_chat_assistant_{i}", "dataset_ids": [dataset_id]})
-        chat_assistant_ids.append(res["data"]["id"])
-
-    return dataset_id, document_id, chat_assistant_ids
+    return dataset_id, document_id, batch_create_chat_assistants(api_key, 5)
diff --git a/test/testcases/test_http_api/test_chat_assistant_management/conftest.py b/test/testcases/test_http_api/test_chat_assistant_management/conftest.py
index 937a0c1ff..ae6c41e3e 100644
--- a/test/testcases/test_http_api/test_chat_assistant_management/conftest.py
+++ b/test/testcases/test_http_api/test_chat_assistant_management/conftest.py
@@ -14,7 +14,7 @@
 #  limitations under the License.
 #
 import pytest
-from common import create_chat_assistant, delete_chat_assistants, list_documents, parse_documents
+from common import batch_create_chat_assistants, delete_chat_assistants, list_documents, parse_documents
 from utils import wait_for
 
 
@@ -37,10 +37,4 @@ def add_chat_assistants_func(request, api_key, add_document):
     dataset_id, document_id = add_document
     parse_documents(api_key, dataset_id, {"document_ids": [document_id]})
     condition(api_key, dataset_id)
-
-    chat_assistant_ids = []
-    for i in range(5):
-        res = create_chat_assistant(api_key, {"name": f"test_chat_assistant_{i}", "dataset_ids": [dataset_id]})
-        chat_assistant_ids.append(res["data"]["id"])
-
-    return dataset_id, document_id, chat_assistant_ids
+    return dataset_id, document_id, batch_create_chat_assistants(api_key, 5)
diff --git a/test/testcases/test_http_api/test_chunk_management_within_dataset/conftest.py b/test/testcases/test_http_api/test_chunk_management_within_dataset/conftest.py
index f953825f9..64e56f139 100644
--- a/test/testcases/test_http_api/test_chunk_management_within_dataset/conftest.py
+++ b/test/testcases/test_http_api/test_chunk_management_within_dataset/conftest.py
@@ -15,8 +15,10 @@
 #
 
 
+from time import sleep
+
 import pytest
-from common import add_chunk, delete_chunks, list_documents, parse_documents
+from common import batch_add_chunks, delete_chunks, list_documents, parse_documents
 from utils import wait_for
 
 
@@ -31,22 +33,15 @@ def condition(_auth, _dataset_id):
 
 @pytest.fixture(scope="function")
 def add_chunks_func(request, api_key, add_document):
+    def cleanup():
+        delete_chunks(api_key, dataset_id, document_id, {"chunk_ids": []})
+
+    request.addfinalizer(cleanup)
+
     dataset_id, document_id = add_document
     parse_documents(api_key, dataset_id, {"document_ids": [document_id]})
     condition(api_key, dataset_id)
-
-    chunk_ids = []
-    for i in range(4):
-        res = add_chunk(api_key, dataset_id, document_id, {"content": f"chunk test {i}"})
-        chunk_ids.append(res["data"]["chunk"]["id"])
-
+    chunk_ids = batch_add_chunks(api_key, dataset_id, document_id, 4)
     # issues/6487
-    from time import sleep
-
     sleep(1)
-
-    def cleanup():
-        delete_chunks(api_key, dataset_id, document_id, {"chunk_ids": chunk_ids})
-
-    request.addfinalizer(cleanup)
     return dataset_id, document_id, chunk_ids
diff --git a/test/testcases/test_http_api/test_file_management_within_dataset/conftest.py b/test/testcases/test_http_api/test_file_management_within_dataset/conftest.py
index e5fe52bd6..04a7b9f74 100644
--- a/test/testcases/test_http_api/test_file_management_within_dataset/conftest.py
+++ b/test/testcases/test_http_api/test_file_management_within_dataset/conftest.py
@@ -21,35 +21,32 @@ from common import bulk_upload_documents, delete_documents
 
 @pytest.fixture(scope="function")
 def add_document_func(request, api_key, add_dataset, ragflow_tmp_dir):
-    dataset_id = add_dataset
-    document_ids = bulk_upload_documents(api_key, dataset_id, 1, ragflow_tmp_dir)
-
     def cleanup():
         delete_documents(api_key, dataset_id, {"ids": None})
 
     request.addfinalizer(cleanup)
-    return dataset_id, document_ids[0]
+
+    dataset_id = add_dataset
+    return dataset_id, bulk_upload_documents(api_key, dataset_id, 1, ragflow_tmp_dir)[0]
 
 
 @pytest.fixture(scope="class")
 def add_documents(request, api_key, add_dataset, ragflow_tmp_dir):
-    dataset_id = add_dataset
-    document_ids = bulk_upload_documents(api_key, dataset_id, 5, ragflow_tmp_dir)
-
     def cleanup():
         delete_documents(api_key, dataset_id, {"ids": None})
 
     request.addfinalizer(cleanup)
-    return dataset_id, document_ids
+
+    dataset_id = add_dataset
+    return dataset_id, bulk_upload_documents(api_key, dataset_id, 5, ragflow_tmp_dir)
 
 
 @pytest.fixture(scope="function")
 def add_documents_func(request, api_key, add_dataset_func, ragflow_tmp_dir):
-    dataset_id = add_dataset_func
-    document_ids = bulk_upload_documents(api_key, dataset_id, 3, ragflow_tmp_dir)
-
     def cleanup():
         delete_documents(api_key, dataset_id, {"ids": None})
 
     request.addfinalizer(cleanup)
-    return dataset_id, document_ids
+
+    dataset_id = add_dataset_func
+    return dataset_id, bulk_upload_documents(api_key, dataset_id, 3, ragflow_tmp_dir)
diff --git a/test/testcases/test_http_api/test_session_management/conftest.py b/test/testcases/test_http_api/test_session_management/conftest.py
index 59a08ce6e..dfda6ad15 100644
--- a/test/testcases/test_http_api/test_session_management/conftest.py
+++ b/test/testcases/test_http_api/test_session_management/conftest.py
@@ -14,40 +14,28 @@
 #  limitations under the License.
 #
 import pytest
-from common import create_session_with_chat_assistant, delete_session_with_chat_assistants
+from common import batch_add_sessions_with_chat_assistant, delete_session_with_chat_assistants
 
 
 @pytest.fixture(scope="class")
 def add_sessions_with_chat_assistant(request, api_key, add_chat_assistants):
-    _, _, chat_assistant_ids = add_chat_assistants
-
     def cleanup():
         for chat_assistant_id in chat_assistant_ids:
             delete_session_with_chat_assistants(api_key, chat_assistant_id)
 
     request.addfinalizer(cleanup)
 
-    session_ids = []
-    for i in range(5):
-        res = create_session_with_chat_assistant(api_key, chat_assistant_ids[0], {"name": f"session_with_chat_assistant_{i}"})
-        session_ids.append(res["data"]["id"])
-
-    return chat_assistant_ids[0], session_ids
+    _, _, chat_assistant_ids = add_chat_assistants
+    return chat_assistant_ids[0], batch_add_sessions_with_chat_assistant(api_key, chat_assistant_ids[0], 5)
 
 
 @pytest.fixture(scope="function")
 def add_sessions_with_chat_assistant_func(request, api_key, add_chat_assistants):
-    _, _, chat_assistant_ids = add_chat_assistants
-
     def cleanup():
         for chat_assistant_id in chat_assistant_ids:
             delete_session_with_chat_assistants(api_key, chat_assistant_id)
 
     request.addfinalizer(cleanup)
 
-    session_ids = []
-    for i in range(5):
-        res = create_session_with_chat_assistant(api_key, chat_assistant_ids[0], {"name": f"session_with_chat_assistant_{i}"})
-        session_ids.append(res["data"]["id"])
-
-    return chat_assistant_ids[0], session_ids
+    _, _, chat_assistant_ids = add_chat_assistants
+    return chat_assistant_ids[0], batch_add_sessions_with_chat_assistant(api_key, chat_assistant_ids[0], 5)
diff --git a/test/testcases/test_http_api/test_session_management/test_create_session_with_chat_assistant.py b/test/testcases/test_http_api/test_session_management/test_create_session_with_chat_assistant.py
index 03725fb98..4fdf34cb1 100644
--- a/test/testcases/test_http_api/test_session_management/test_create_session_with_chat_assistant.py
+++ b/test/testcases/test_http_api/test_session_management/test_create_session_with_chat_assistant.py
@@ -13,7 +13,7 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 #
-from concurrent.futures import ThreadPoolExecutor
+from concurrent.futures import ThreadPoolExecutor, as_completed
 
 import pytest
 from common import INVALID_API_TOKEN, SESSION_WITH_CHAT_NAME_LIMIT, create_session_with_chat_assistant, delete_chat_assistants, list_session_with_chat_assistants
@@ -83,12 +83,12 @@ class TestSessionWithChatAssistantCreate:
 
     @pytest.mark.p3
     def test_concurrent_create_session(self, api_key, add_chat_assistants):
-        chunk_num = 1000
+        count = 1000
         _, _, chat_assistant_ids = add_chat_assistants
         res = list_session_with_chat_assistants(api_key, chat_assistant_ids[0])
         if res["code"] != 0:
             assert False, res
-        chunks_count = len(res["data"])
+        sessions_count = len(res["data"])
 
         with ThreadPoolExecutor(max_workers=5) as executor:
             futures = [
@@ -98,14 +98,15 @@ class TestSessionWithChatAssistantCreate:
                     chat_assistant_ids[0],
                     {"name": f"session with chat assistant test {i}"},
                 )
-                for i in range(chunk_num)
+                for i in range(count)
             ]
-        responses = [f.result() for f in futures]
-        assert all(r["code"] == 0 for r in responses)
-        res = list_session_with_chat_assistants(api_key, chat_assistant_ids[0], {"page_size": chunk_num})
+        responses = list(as_completed(futures))
+        assert len(responses) == count, responses
+        assert all(future.result()["code"] == 0 for future in futures)
+        res = list_session_with_chat_assistants(api_key, chat_assistant_ids[0], {"page_size": count * 2})
         if res["code"] != 0:
             assert False, res
-        assert len(res["data"]) == chunks_count + chunk_num
+        assert len(res["data"]) == sessions_count + count
 
     @pytest.mark.p3
     def test_add_session_to_deleted_chat_assistant(self, api_key, add_chat_assistants):
diff --git a/test/testcases/test_http_api/test_session_management/test_delete_sessions_with_chat_assistant.py b/test/testcases/test_http_api/test_session_management/test_delete_sessions_with_chat_assistant.py
index 53eafc3dc..f9daa50b3 100644
--- a/test/testcases/test_http_api/test_session_management/test_delete_sessions_with_chat_assistant.py
+++ b/test/testcases/test_http_api/test_session_management/test_delete_sessions_with_chat_assistant.py
@@ -13,7 +13,7 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 #
-from concurrent.futures import ThreadPoolExecutor
+from concurrent.futures import ThreadPoolExecutor, as_completed
 
 import pytest
 from common import INVALID_API_TOKEN, batch_add_sessions_with_chat_assistant, delete_session_with_chat_assistants, list_session_with_chat_assistants
@@ -105,9 +105,9 @@ class TestSessionWithChatAssistantDelete:
 
     @pytest.mark.p3
     def test_concurrent_deletion(self, api_key, add_chat_assistants):
-        sessions_num = 100
+        count = 100
         _, _, chat_assistant_ids = add_chat_assistants
-        session_ids = batch_add_sessions_with_chat_assistant(api_key, chat_assistant_ids[0], sessions_num)
+        session_ids = batch_add_sessions_with_chat_assistant(api_key, chat_assistant_ids[0], count)
 
         with ThreadPoolExecutor(max_workers=5) as executor:
             futures = [
@@ -117,10 +117,11 @@ class TestSessionWithChatAssistantDelete:
                     chat_assistant_ids[0],
                     {"ids": session_ids[i : i + 1]},
                 )
-                for i in range(sessions_num)
+                for i in range(count)
             ]
-        responses = [f.result() for f in futures]
-        assert all(r["code"] == 0 for r in responses)
+        responses = list(as_completed(futures))
+        assert len(responses) == count, responses
+        assert all(future.result()["code"] == 0 for future in futures)
 
     @pytest.mark.p3
     def test_delete_1k(self, api_key, add_chat_assistants):
diff --git a/test/testcases/test_http_api/test_session_management/test_list_sessions_with_chat_assistant.py b/test/testcases/test_http_api/test_session_management/test_list_sessions_with_chat_assistant.py
index 4cceb69cb..e857e03b4 100644
--- a/test/testcases/test_http_api/test_session_management/test_list_sessions_with_chat_assistant.py
+++ b/test/testcases/test_http_api/test_session_management/test_list_sessions_with_chat_assistant.py
@@ -13,7 +13,7 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 #
-from concurrent.futures import ThreadPoolExecutor
+from concurrent.futures import ThreadPoolExecutor, as_completed
 
 import pytest
 from common import INVALID_API_TOKEN, delete_chat_assistants, list_session_with_chat_assistants
@@ -222,11 +222,13 @@ class TestSessionsWithChatAssistantList:
 
     @pytest.mark.p3
     def test_concurrent_list(self, api_key, add_sessions_with_chat_assistant):
+        count = 100
         chat_assistant_id, _ = add_sessions_with_chat_assistant
         with ThreadPoolExecutor(max_workers=5) as executor:
-            futures = [executor.submit(list_session_with_chat_assistants, api_key, chat_assistant_id) for i in range(100)]
-        responses = [f.result() for f in futures]
-        assert all(r["code"] == 0 for r in responses)
+            futures = [executor.submit(list_session_with_chat_assistants, api_key, chat_assistant_id) for i in range(count)]
+        responses = list(as_completed(futures))
+        assert len(responses) == count, responses
+        assert all(future.result()["code"] == 0 for future in futures)
 
     @pytest.mark.p3
     def test_invalid_params(self, api_key, add_sessions_with_chat_assistant):
diff --git a/test/testcases/test_http_api/test_session_management/test_update_session_with_chat_assistant.py b/test/testcases/test_http_api/test_session_management/test_update_session_with_chat_assistant.py
index 7da112998..2e79f8c36 100644
--- a/test/testcases/test_http_api/test_session_management/test_update_session_with_chat_assistant.py
+++ b/test/testcases/test_http_api/test_session_management/test_update_session_with_chat_assistant.py
@@ -13,7 +13,7 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 #
-from concurrent.futures import ThreadPoolExecutor
+from concurrent.futures import ThreadPoolExecutor, as_completed
 from random import randint
 
 import pytest
@@ -122,7 +122,7 @@ class TestSessionWithChatAssistantUpdate:
 
     @pytest.mark.p3
     def test_concurrent_update_session(self, api_key, add_sessions_with_chat_assistant_func):
-        chunk_num = 50
+        count = 50
         chat_assistant_id, session_ids = add_sessions_with_chat_assistant_func
 
         with ThreadPoolExecutor(max_workers=5) as executor:
@@ -134,10 +134,11 @@ class TestSessionWithChatAssistantUpdate:
                     session_ids[randint(0, 4)],
                     {"name": f"update session test {i}"},
                 )
-                for i in range(chunk_num)
+                for i in range(count)
             ]
-        responses = [f.result() for f in futures]
-        assert all(r["code"] == 0 for r in responses)
+        responses = list(as_completed(futures))
+        assert len(responses) == count, responses
+        assert all(future.result()["code"] == 0 for future in futures)
 
     @pytest.mark.p3
     def test_update_session_to_deleted_chat_assistant(self, api_key, add_sessions_with_chat_assistant_func):
diff --git a/test/testcases/test_sdk_api/common.py b/test/testcases/test_sdk_api/common.py
index 11474e0ea..3035383a4 100644
--- a/test/testcases/test_sdk_api/common.py
+++ b/test/testcases/test_sdk_api/common.py
@@ -16,7 +16,7 @@
 
 from pathlib import Path
 
-from ragflow_sdk import DataSet, Document, RAGFlow
+from ragflow_sdk import Chat, Chunk, DataSet, Document, RAGFlow, Session
 from utils.file_utils import create_txt_file
 
 
@@ -38,10 +38,15 @@ def bulk_upload_documents(dataset: DataSet, num: int, tmp_path: Path) -> list[Do
 
 
 # CHUNK MANAGEMENT WITHIN DATASET
-def batch_add_chunks(document: Document, num: int):
+def batch_add_chunks(document: Document, num: int) -> list[Chunk]:
     return [document.add_chunk(content=f"chunk test {i}") for i in range(num)]
 
 
 # CHAT ASSISTANT MANAGEMENT
-def batch_create_chat_assistants(client: RAGFlow, num: int):
+def batch_create_chat_assistants(client: RAGFlow, num: int) -> list[Chat]:
     return [client.create_chat(name=f"test_chat_assistant_{i}") for i in range(num)]
+
+
+# SESSION MANAGEMENT
+def batch_add_sessions_with_chat_assistant(chat_assistant: Chat, num) -> list[Session]:
+    return [chat_assistant.create_session(name=f"session_with_chat_assistant_{i}") for i in range(num)]
diff --git a/test/testcases/test_sdk_api/conftest.py b/test/testcases/test_sdk_api/conftest.py
index 47d89e2d1..5c74e3a27 100644
--- a/test/testcases/test_sdk_api/conftest.py
+++ b/test/testcases/test_sdk_api/conftest.py
@@ -15,15 +15,18 @@
 #
 
 from pathlib import Path
+from time import sleep
 
 import pytest
 from common import (
+    batch_add_chunks,
+    batch_create_chat_assistants,
     batch_create_datasets,
     bulk_upload_documents,
 )
 from configs import HOST_ADDRESS, VERSION
 from pytest import FixtureRequest
-from ragflow_sdk import Chunk, DataSet, Document, RAGFlow
+from ragflow_sdk import Chat, Chunk, DataSet, Document, RAGFlow
 from utils import wait_for
 from utils.file_utils import (
     create_docx_file,
@@ -98,6 +101,20 @@ def clear_chat_assistants(request: FixtureRequest, client: RAGFlow):
     request.addfinalizer(cleanup)
 
 
+@pytest.fixture(scope="function")
+def clear_session_with_chat_assistants(request, add_chat_assistants):
+    def cleanup():
+        for chat_assistant in chat_assistants:
+            try:
+                chat_assistant.delete_sessions(ids=None)
+            except Exception:
+                pass
+
+    request.addfinalizer(cleanup)
+
+    _, _, chat_assistants = add_chat_assistants
+
+
 @pytest.fixture(scope="class")
 def add_dataset(request: FixtureRequest, client: RAGFlow):
     def cleanup():
@@ -123,20 +140,6 @@ def add_document(add_dataset: DataSet, ragflow_tmp_dir: Path) -> tuple[DataSet,
 
 @pytest.fixture(scope="class")
 def add_chunks(request: FixtureRequest, add_document: tuple[DataSet, Document]) -> tuple[DataSet, Document, list[Chunk]]:
-    dataset, document = add_document
-    dataset.async_parse_documents([document.id])
-    condition(dataset)
-
-    chunks = []
-    for i in range(4):
-        chunk = document.add_chunk(content=f"chunk test {i}")
-        chunks.append(chunk)
-
-    # issues/6487
-    from time import sleep
-
-    sleep(1)
-
     def cleanup():
         try:
             document.delete_chunks(ids=[])
@@ -144,23 +147,27 @@ def add_chunks(request: FixtureRequest, add_document: tuple[DataSet, Document])
             pass
 
     request.addfinalizer(cleanup)
+
+    dataset, document = add_document
+    dataset.async_parse_documents([document.id])
+    condition(dataset)
+    chunks = batch_add_chunks(document, 4)
+    # issues/6487
+    sleep(1)
     return dataset, document, chunks
 
 
 @pytest.fixture(scope="class")
-def add_chat_assistants(request, client, add_document):
+def add_chat_assistants(request, client, add_document) -> tuple[DataSet, Document, list[Chat]]:
     def cleanup():
-        client.delete_chats(ids=None)
+        try:
+            client.delete_chats(ids=None)
+        except Exception:
+            pass
 
     request.addfinalizer(cleanup)
 
     dataset, document = add_document
     dataset.async_parse_documents([document.id])
     condition(dataset)
-
-    chat_assistants = []
-    for i in range(5):
-        chat_assistant = client.create_chat(name=f"test_chat_assistant_{i}", dataset_ids=[dataset.id])
-        chat_assistants.append(chat_assistant)
-
-    return dataset, document, chat_assistants
+    return dataset, document, batch_create_chat_assistants(client, 5)
diff --git a/test/testcases/test_sdk_api/test_chat_assistant_management/conftest.py b/test/testcases/test_sdk_api/test_chat_assistant_management/conftest.py
index 33996594c..79347d67a 100644
--- a/test/testcases/test_sdk_api/test_chat_assistant_management/conftest.py
+++ b/test/testcases/test_sdk_api/test_chat_assistant_management/conftest.py
@@ -14,6 +14,7 @@
 #  limitations under the License.
 #
 import pytest
+from common import batch_create_chat_assistants
 from pytest import FixtureRequest
 from ragflow_sdk import Chat, DataSet, Document, RAGFlow
 from utils import wait_for
@@ -38,10 +39,4 @@ def add_chat_assistants_func(request: FixtureRequest, client: RAGFlow, add_docum
     dataset, document = add_document
     dataset.async_parse_documents([document.id])
     condition(dataset)
-
-    chat_assistants = []
-    for i in range(5):
-        chat_assistant = client.create_chat(name=f"test_chat_assistant_{i}", dataset_ids=[dataset.id])
-        chat_assistants.append(chat_assistant)
-
-    return dataset, document, chat_assistants
+    return dataset, document, batch_create_chat_assistants(client, 5)
diff --git a/test/testcases/test_sdk_api/test_chunk_management_within_dataset/conftest.py b/test/testcases/test_sdk_api/test_chunk_management_within_dataset/conftest.py
index 627d89e5a..d9ed67838 100644
--- a/test/testcases/test_sdk_api/test_chunk_management_within_dataset/conftest.py
+++ b/test/testcases/test_sdk_api/test_chunk_management_within_dataset/conftest.py
@@ -15,7 +15,10 @@
 #
 
 
+from time import sleep
+
 import pytest
+from common import batch_add_chunks
 from pytest import FixtureRequest
 from ragflow_sdk import Chunk, DataSet, Document
 from utils import wait_for
@@ -32,18 +35,18 @@ def condition(_dataset: DataSet):
 
 @pytest.fixture(scope="function")
 def add_chunks_func(request: FixtureRequest, add_document: tuple[DataSet, Document]) -> tuple[DataSet, Document, list[Chunk]]:
+    def cleanup():
+        try:
+            document.delete_chunks(ids=[])
+        except Exception:
+            pass
+
+    request.addfinalizer(cleanup)
+
     dataset, document = add_document
     dataset.async_parse_documents([document.id])
     condition(dataset)
-    chunks = [document.add_chunk(content=f"chunk test {i}") for i in range(4)]
-
+    chunks = batch_add_chunks(document, 4)
     # issues/6487
-    from time import sleep
-
     sleep(1)
-
-    def cleanup():
-        document.delete_chunks(ids=[])
-
-    request.addfinalizer(cleanup)
     return dataset, document, chunks
diff --git a/test/testcases/test_sdk_api/test_session_management/conftest.py b/test/testcases/test_sdk_api/test_session_management/conftest.py
new file mode 100644
index 000000000..08dfd08d2
--- /dev/null
+++ b/test/testcases/test_sdk_api/test_session_management/conftest.py
@@ -0,0 +1,49 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
+#  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
+#
+#      http://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 pytest
+from common import batch_add_sessions_with_chat_assistant
+from pytest import FixtureRequest
+from ragflow_sdk import Chat, DataSet, Document, Session
+
+
+@pytest.fixture(scope="class")
+def add_sessions_with_chat_assistant(request: FixtureRequest, add_chat_assistants: tuple[DataSet, Document, list[Chat]]) -> tuple[Chat, list[Session]]:
+    def cleanup():
+        for chat_assistant in chat_assistants:
+            try:
+                chat_assistant.delete_sessions(ids=None)
+            except Exception:
+                pass
+
+    request.addfinalizer(cleanup)
+
+    _, _, chat_assistants = add_chat_assistants
+    return chat_assistants[0], batch_add_sessions_with_chat_assistant(chat_assistants[0], 5)
+
+
+@pytest.fixture(scope="function")
+def add_sessions_with_chat_assistant_func(request: FixtureRequest, add_chat_assistants: tuple[DataSet, Document, list[Chat]]) -> tuple[Chat, list[Session]]:
+    def cleanup():
+        for chat_assistant in chat_assistants:
+            try:
+                chat_assistant.delete_sessions(ids=None)
+            except Exception:
+                pass
+
+    request.addfinalizer(cleanup)
+
+    _, _, chat_assistants = add_chat_assistants
+    return chat_assistants[0], batch_add_sessions_with_chat_assistant(chat_assistants[0], 5)
diff --git a/test/testcases/test_sdk_api/test_session_management/test_create_session_with_chat_assistant.py b/test/testcases/test_sdk_api/test_session_management/test_create_session_with_chat_assistant.py
new file mode 100644
index 000000000..084c7122c
--- /dev/null
+++ b/test/testcases/test_sdk_api/test_session_management/test_create_session_with_chat_assistant.py
@@ -0,0 +1,76 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
+#  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
+#
+#      http://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.
+#
+from concurrent.futures import ThreadPoolExecutor, as_completed
+
+import pytest
+from configs import SESSION_WITH_CHAT_NAME_LIMIT
+
+
+@pytest.mark.usefixtures("clear_session_with_chat_assistants")
+class TestSessionWithChatAssistantCreate:
+    @pytest.mark.p1
+    @pytest.mark.parametrize(
+        "name, expected_message",
+        [
+            ("valid_name", ""),
+            pytest.param("a" * (SESSION_WITH_CHAT_NAME_LIMIT + 1), "", marks=pytest.mark.skip(reason="issues/")),
+            pytest.param(1, "", marks=pytest.mark.skip(reason="issues/")),
+            ("", "`name` can not be empty."),
+            ("duplicated_name", ""),
+            ("case insensitive", ""),
+        ],
+    )
+    def test_name(self, add_chat_assistants, name, expected_message):
+        _, _, chat_assistants = add_chat_assistants
+        chat_assistant = chat_assistants[0]
+
+        if name == "duplicated_name":
+            chat_assistant.create_session(name=name)
+        elif name == "case insensitive":
+            chat_assistant.create_session(name=name.upper())
+
+        if expected_message:
+            with pytest.raises(Exception) as excinfo:
+                chat_assistant.create_session(name=name)
+            assert expected_message in str(excinfo.value)
+        else:
+            session = chat_assistant.create_session(name=name)
+            assert session.name == name, str(session)
+            assert session.chat_id == chat_assistant.id, str(session)
+
+    @pytest.mark.p3
+    def test_concurrent_create_session(self, add_chat_assistants):
+        count = 1000
+        _, _, chat_assistants = add_chat_assistants
+        chat_assistant = chat_assistants[0]
+
+        with ThreadPoolExecutor(max_workers=5) as executor:
+            futures = [executor.submit(chat_assistant.create_session, name=f"session with chat assistant test {i}") for i in range(count)]
+        responses = list(as_completed(futures))
+        assert len(responses) == count, responses
+
+        updated_sessions = chat_assistant.list_sessions(page_size=count * 2)
+        assert len(updated_sessions) == count
+
+    @pytest.mark.p3
+    def test_add_session_to_deleted_chat_assistant(self, client, add_chat_assistants):
+        _, _, chat_assistants = add_chat_assistants
+        chat_assistant = chat_assistants[0]
+
+        client.delete_chats(ids=[chat_assistant.id])
+        with pytest.raises(Exception) as excinfo:
+            chat_assistant.create_session(name="valid_name")
+        assert "You do not own the assistant" in str(excinfo.value)
diff --git a/test/testcases/test_sdk_api/test_session_management/test_delete_sessions_with_chat_assistant.py b/test/testcases/test_sdk_api/test_session_management/test_delete_sessions_with_chat_assistant.py
new file mode 100644
index 000000000..0c3c0ebe4
--- /dev/null
+++ b/test/testcases/test_sdk_api/test_session_management/test_delete_sessions_with_chat_assistant.py
@@ -0,0 +1,108 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
+#  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
+#
+#      http://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.
+#
+
+from concurrent.futures import ThreadPoolExecutor, as_completed
+
+import pytest
+from common import batch_add_sessions_with_chat_assistant
+
+
+class TestSessionWithChatAssistantDelete:
+    @pytest.mark.parametrize(
+        "payload",
+        [
+            pytest.param(lambda r: {"ids": ["invalid_id"] + r}, marks=pytest.mark.p3),
+            pytest.param(lambda r: {"ids": r[:1] + ["invalid_id"] + r[1:5]}, marks=pytest.mark.p1),
+            pytest.param(lambda r: {"ids": r + ["invalid_id"]}, marks=pytest.mark.p3),
+        ],
+    )
+    def test_delete_partial_invalid_id(self, add_sessions_with_chat_assistant_func, payload):
+        chat_assistant, sessions = add_sessions_with_chat_assistant_func
+        if callable(payload):
+            payload = payload([session.id for session in sessions])
+
+        chat_assistant.delete_sessions(**payload)
+
+        sessions = chat_assistant.list_sessions()
+        assert len(sessions) == 0
+
+    @pytest.mark.p3
+    def test_repeated_deletion(self, add_sessions_with_chat_assistant_func):
+        chat_assistant, sessions = add_sessions_with_chat_assistant_func
+        session_ids = {"ids": [session.id for session in sessions]}
+
+        chat_assistant.delete_sessions(**session_ids)
+
+        with pytest.raises(Exception) as excinfo:
+            chat_assistant.delete_sessions(**session_ids)
+        assert "The chat doesn't own the session" in str(excinfo.value)
+
+    @pytest.mark.p3
+    def test_duplicate_deletion(self, add_sessions_with_chat_assistant_func):
+        chat_assistant, sessions = add_sessions_with_chat_assistant_func
+        session_ids = {"ids": [session.id for session in sessions] * 2}
+        chat_assistant.delete_sessions(**session_ids)
+        sessions = chat_assistant.list_sessions()
+        assert len(sessions) == 0
+
+    @pytest.mark.p3
+    def test_concurrent_deletion(self, add_chat_assistants):
+        count = 100
+        _, _, chat_assistants = add_chat_assistants
+        chat_assistant = chat_assistants[0]
+        sessions = batch_add_sessions_with_chat_assistant(chat_assistant, count)
+
+        with ThreadPoolExecutor(max_workers=5) as executor:
+            futures = [executor.submit(chat_assistant.delete_sessions, ids=[sessions[i].id]) for i in range(count)]
+        responses = list(as_completed(futures))
+        assert len(responses) == count, responses
+
+    @pytest.mark.p3
+    def test_delete_1k(self, add_chat_assistants):
+        count = 1_000
+        _, _, chat_assistants = add_chat_assistants
+        chat_assistant = chat_assistants[0]
+        ssessions = batch_add_sessions_with_chat_assistant(chat_assistant, count)
+        chat_assistant.delete_sessions(ids=[ssession.id for ssession in ssessions])
+
+        sessions = chat_assistant.list_sessions()
+        assert len(sessions) == 0
+
+    @pytest.mark.parametrize(
+        "payload, expected_message, remaining",
+        [
+            pytest.param(None, """TypeError("argument of type \'NoneType\' is not iterable")""", 0, marks=pytest.mark.skip),
+            pytest.param({"ids": ["invalid_id"]}, "The chat doesn't own the session invalid_id", 5, marks=pytest.mark.p3),
+            pytest.param("not json", """AttributeError("\'str\' object has no attribute \'get\'")""", 5, marks=pytest.mark.skip),
+            pytest.param(lambda r: {"ids": r[:1]}, "", 4, marks=pytest.mark.p3),
+            pytest.param(lambda r: {"ids": r}, "", 0, marks=pytest.mark.p1),
+            pytest.param({"ids": []}, "", 0, marks=pytest.mark.p3),
+        ],
+    )
+    def test_basic_scenarios(self, add_sessions_with_chat_assistant_func, payload, expected_message, remaining):
+        chat_assistant, sessions = add_sessions_with_chat_assistant_func
+        if callable(payload):
+            payload = payload([session.id for session in sessions])
+
+        if expected_message:
+            with pytest.raises(Exception) as excinfo:
+                chat_assistant.delete_sessions(**payload)
+            assert expected_message in str(excinfo.value)
+        else:
+            chat_assistant.delete_sessions(**payload)
+
+        sessions = chat_assistant.list_sessions()
+        assert len(sessions) == remaining
diff --git a/test/testcases/test_sdk_api/test_session_management/test_list_sessions_with_chat_assistant.py b/test/testcases/test_sdk_api/test_session_management/test_list_sessions_with_chat_assistant.py
new file mode 100644
index 000000000..58ed11ae6
--- /dev/null
+++ b/test/testcases/test_sdk_api/test_session_management/test_list_sessions_with_chat_assistant.py
@@ -0,0 +1,203 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
+#  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
+#
+#      http://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 pytest
+from concurrent.futures import ThreadPoolExecutor, as_completed
+
+
+class TestSessionsWithChatAssistantList:
+    @pytest.mark.p1
+    @pytest.mark.parametrize(
+        "params, expected_page_size, expected_message",
+        [
+            ({"page": None, "page_size": 2}, 0, "not instance of"),
+            pytest.param({"page": 0, "page_size": 2}, 0, "ValueError('Search does not support negative slicing.')", marks=pytest.mark.skip),
+            ({"page": 2, "page_size": 2}, 2, ""),
+            ({"page": 3, "page_size": 2}, 1, ""),
+            ({"page": "3", "page_size": 2}, 0, "not instance of"),
+            pytest.param({"page": -1, "page_size": 2}, 0, "ValueError('Search does not support negative slicing.')", marks=pytest.mark.skip),
+            pytest.param({"page": "a", "page_size": 2}, 0, """ValueError("invalid literal for int() with base 10: \'a\'")""", marks=pytest.mark.skip),
+        ],
+    )
+    def test_page(self, add_sessions_with_chat_assistant, params, expected_page_size, expected_message):
+        chat_assistant, _ = add_sessions_with_chat_assistant
+        if expected_message:
+            with pytest.raises(Exception) as excinfo:
+                chat_assistant.list_sessions(**params)
+            assert expected_message in str(excinfo.value)
+        else:
+            sessions = chat_assistant.list_sessions(**params)
+            assert len(sessions) == expected_page_size
+
+    @pytest.mark.p1
+    @pytest.mark.parametrize(
+        "params, expected_page_size, expected_message",
+        [
+            ({"page_size": None}, 0, "not instance of"),
+            ({"page_size": 0}, 0, ""),
+            ({"page_size": 1}, 1, ""),
+            ({"page_size": 6}, 5, ""),
+            ({"page_size": "1"}, 0, "not instance of"),
+            pytest.param({"page_size": -1}, 5, "", marks=pytest.mark.skip),
+            pytest.param({"page_size": "a"}, 0, """ValueError("invalid literal for int() with base 10: \'a\'")""", marks=pytest.mark.skip),
+        ],
+    )
+    def test_page_size(self, add_sessions_with_chat_assistant, params, expected_page_size, expected_message):
+        chat_assistant, _ = add_sessions_with_chat_assistant
+        if expected_message:
+            with pytest.raises(Exception) as excinfo:
+                chat_assistant.list_sessions(**params)
+            assert expected_message in str(excinfo.value)
+        else:
+            sessions = chat_assistant.list_sessions(**params)
+            assert len(sessions) == expected_page_size
+
+    @pytest.mark.p3
+    @pytest.mark.parametrize(
+        "params, expected_message",
+        [
+            ({"orderby": None}, "not instance of"),
+            ({"orderby": "create_time"}, ""),
+            ({"orderby": "update_time"}, ""),
+            ({"orderby": "name", "desc": "False"}, "not instance of"),
+            pytest.param({"orderby": "unknown"}, "orderby should be create_time or update_time", marks=pytest.mark.skip(reason="issues/")),
+        ],
+    )
+    def test_orderby(self, add_sessions_with_chat_assistant, params, expected_message):
+        chat_assistant, _ = add_sessions_with_chat_assistant
+        if expected_message:
+            with pytest.raises(Exception) as excinfo:
+                chat_assistant.list_sessions(**params)
+            assert expected_message in str(excinfo.value)
+        else:
+            chat_assistant.list_sessions(**params)
+
+    @pytest.mark.p3
+    @pytest.mark.parametrize(
+        "params, expected_message",
+        [
+            ({"desc": None}, "not instance of"),
+            ({"desc": "true"}, "not instance of"),
+            ({"desc": "True"}, "not instance of"),
+            ({"desc": True}, ""),
+            ({"desc": "false"}, "not instance of"),
+            ({"desc": "False"}, "not instance of"),
+            ({"desc": False}, ""),
+            ({"desc": "False", "orderby": "update_time"}, "not instance of"),
+            pytest.param({"desc": "unknown"}, "desc should be true or false", marks=pytest.mark.skip(reason="issues/")),
+        ],
+    )
+    def test_desc(self, add_sessions_with_chat_assistant, params, expected_message):
+        chat_assistant, _ = add_sessions_with_chat_assistant
+        if expected_message:
+            with pytest.raises(Exception) as excinfo:
+                chat_assistant.list_sessions(**params)
+            assert expected_message in str(excinfo.value)
+        else:
+            chat_assistant.list_sessions(**params)
+
+    @pytest.mark.p1
+    @pytest.mark.parametrize(
+        "params, expected_num, expected_message",
+        [
+            ({"name": None}, 0, "not instance of"),
+            ({"name": ""}, 5, ""),
+            ({"name": "session_with_chat_assistant_1"}, 1, ""),
+            ({"name": "unknown"}, 0, ""),
+        ],
+    )
+    def test_name(self, add_sessions_with_chat_assistant, params, expected_num, expected_message):
+        chat_assistant, _ = add_sessions_with_chat_assistant
+        if expected_message:
+            with pytest.raises(Exception) as excinfo:
+                chat_assistant.list_sessions(**params)
+            assert expected_message in str(excinfo.value)
+        else:
+            sessions = chat_assistant.list_sessions(**params)
+            if params["name"] != "session_with_chat_assistant_1":
+                assert len(sessions) == expected_num
+            else:
+                assert sessions[0].name == params["name"]
+
+    @pytest.mark.p1
+    @pytest.mark.parametrize(
+        "session_id, expected_num, expected_message",
+        [
+            (None, 0, "not instance of"),
+            ("", 5, ""),
+            (lambda r: r[0], 1, ""),
+            ("unknown", 0, ""),
+        ],
+    )
+    def test_id(self, add_sessions_with_chat_assistant, session_id, expected_num, expected_message):
+        chat_assistant, sessions = add_sessions_with_chat_assistant
+        if callable(session_id):
+            params = {"id": session_id([s.id for s in sessions])}
+        else:
+            params = {"id": session_id}
+
+        if expected_message:
+            with pytest.raises(Exception) as excinfo:
+                chat_assistant.list_sessions(**params)
+            assert expected_message in str(excinfo.value)
+        else:
+            list_sessions = chat_assistant.list_sessions(**params)
+            if "id" in params and params["id"] != sessions[0].id:
+                assert len(list_sessions) == expected_num
+            else:
+                assert list_sessions[0].id == params["id"]
+
+    @pytest.mark.p3
+    @pytest.mark.parametrize(
+        "session_id, name, expected_num, expected_message",
+        [
+            (lambda r: r[0], "session_with_chat_assistant_0", 1, ""),
+            (lambda r: r[0], "session_with_chat_assistant_100", 0, ""),
+            (lambda r: r[0], "unknown", 0, ""),
+            ("id", "session_with_chat_assistant_0", 0, ""),
+        ],
+    )
+    def test_name_and_id(self, add_sessions_with_chat_assistant, session_id, name, expected_num, expected_message):
+        chat_assistant, sessions = add_sessions_with_chat_assistant
+        if callable(session_id):
+            params = {"id": session_id([s.id for s in sessions]), "name": name}
+        else:
+            params = {"id": session_id, "name": name}
+
+        if expected_message:
+            with pytest.raises(Exception) as excinfo:
+                chat_assistant.list_sessions(**params)
+            assert expected_message in str(excinfo.value)
+        else:
+            list_sessions = chat_assistant.list_sessions(**params)
+            assert len(list_sessions) == expected_num
+
+    @pytest.mark.p3
+    def test_concurrent_list(self, add_sessions_with_chat_assistant):
+        count = 100
+        chat_assistant, _ = add_sessions_with_chat_assistant
+        with ThreadPoolExecutor(max_workers=5) as executor:
+            futures = [executor.submit(chat_assistant.list_sessions) for i in range(count)]
+        responses = list(as_completed(futures))
+        assert len(responses) == count, responses
+
+    @pytest.mark.p3
+    def test_list_chats_after_deleting_associated_chat_assistant(self, client, add_sessions_with_chat_assistant):
+        chat_assistant, _ = add_sessions_with_chat_assistant
+        client.delete_chats(ids=[chat_assistant.id])
+
+        with pytest.raises(Exception) as excinfo:
+            chat_assistant.list_sessions()
+        assert "You don't own the assistant" in str(excinfo.value)
diff --git a/test/testcases/test_sdk_api/test_session_management/test_update_session_with_chat_assistant.py b/test/testcases/test_sdk_api/test_session_management/test_update_session_with_chat_assistant.py
new file mode 100644
index 000000000..d0fa3e187
--- /dev/null
+++ b/test/testcases/test_sdk_api/test_session_management/test_update_session_with_chat_assistant.py
@@ -0,0 +1,98 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
+#  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
+#
+#      http://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.
+#
+from concurrent.futures import ThreadPoolExecutor, as_completed
+from random import randint
+
+import pytest
+from configs import SESSION_WITH_CHAT_NAME_LIMIT
+
+
+class TestSessionWithChatAssistantUpdate:
+    @pytest.mark.parametrize(
+        "payload, expected_message",
+        [
+            pytest.param({"name": "valid_name"}, "", marks=pytest.mark.p1),
+            pytest.param({"name": "a" * (SESSION_WITH_CHAT_NAME_LIMIT + 1)}, "", marks=pytest.mark.skip(reason="issues/")),
+            pytest.param({"name": 1}, "", marks=pytest.mark.skip(reason="issues/")),
+            pytest.param({"name": ""}, "`name` can not be empty.", marks=pytest.mark.p3),
+            pytest.param({"name": "duplicated_name"}, "", marks=pytest.mark.p3),
+            pytest.param({"name": "case insensitive"}, "", marks=pytest.mark.p3),
+        ],
+    )
+    def test_name(self, add_sessions_with_chat_assistant_func, payload, expected_message):
+        chat_assistant, sessions = add_sessions_with_chat_assistant_func
+        session = sessions[0]
+
+        if payload["name"] == "duplicated_name":
+            session.update(payload)
+        elif payload["name"] == "case insensitive":
+            session.update({"name": payload["name"].upper()})
+
+        if expected_message:
+            with pytest.raises(Exception) as excinfo:
+                session.update(payload)
+            assert expected_message in str(excinfo.value)
+        else:
+            session.update(payload)
+            updated_session = chat_assistant.list_sessions(id=session.id)[0]
+            assert updated_session.name == payload["name"]
+
+    @pytest.mark.p3
+    def test_repeated_update_session(self, add_sessions_with_chat_assistant_func):
+        _, sessions = add_sessions_with_chat_assistant_func
+        session = sessions[0]
+
+        session.update({"name": "valid_name_1"})
+        session.update({"name": "valid_name_2"})
+
+    @pytest.mark.p3
+    @pytest.mark.parametrize(
+        "payload, expected_message",
+        [
+            pytest.param({"unknown_key": "unknown_value"}, "ValueError", marks=pytest.mark.skip),
+            ({}, ""),
+            pytest.param(None, "TypeError", marks=pytest.mark.skip),
+        ],
+    )
+    def test_invalid_params(self, add_sessions_with_chat_assistant_func, payload, expected_message):
+        _, sessions = add_sessions_with_chat_assistant_func
+        session = sessions[0]
+
+        if expected_message:
+            with pytest.raises(Exception) as excinfo:
+                session.update(payload)
+            assert expected_message in str(excinfo.value)
+        else:
+            session.update(payload)
+
+    @pytest.mark.p3
+    def test_concurrent_update_session(self, add_sessions_with_chat_assistant_func):
+        count = 50
+        _, sessions = add_sessions_with_chat_assistant_func
+
+        with ThreadPoolExecutor(max_workers=5) as executor:
+            futures = [executor.submit(sessions[randint(0, 4)].update, {"name": f"update session test {i}"}) for i in range(count)]
+        responses = list(as_completed(futures))
+        assert len(responses) == count, responses
+
+    @pytest.mark.p3
+    def test_update_session_to_deleted_chat_assistant(self, client, add_sessions_with_chat_assistant_func):
+        chat_assistant, sessions = add_sessions_with_chat_assistant_func
+        client.delete_chats(ids=[chat_assistant.id])
+
+        with pytest.raises(Exception) as excinfo:
+            sessions[0].update({"name": "valid_name"})
+        assert "You do not own the session" in str(excinfo.value)