Add tests for frontend API (#3552)

### What problem does this PR solve?

Add tests for frontend API

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

---------

Co-authored-by: liuhua <10215101452@stu.ecun.edu.cn>

sdk/python/test/test_sdk_api/t_chat.py

@@ -0,0 +1,70 @@
+from ragflow_sdk import RAGFlow
+from common import HOST_ADDRESS
+
+def test_create_chat_with_name(get_api_key_fixture):
+    API_KEY = get_api_key_fixture
+    rag = RAGFlow(API_KEY, HOST_ADDRESS)
+    kb = rag.create_dataset(name="test_create_chat")
+    displayed_name = "ragflow.txt"
+    with open("test_data/ragflow.txt", "rb") as file:
+        blob = file.read()
+    document = {"displayed_name":displayed_name,"blob":blob}
+    documents = []
+    documents.append(document)
+    docs= kb.upload_documents(documents)
+    for doc in docs:
+        doc.add_chunk("This is a test to add chunk")
+    rag.create_chat("test_create_chat", dataset_ids=[kb.id])
+
+
+def test_update_chat_with_name(get_api_key_fixture):
+    API_KEY = get_api_key_fixture
+    rag = RAGFlow(API_KEY, HOST_ADDRESS)
+    kb = rag.create_dataset(name="test_update_chat")
+    displayed_name = "ragflow.txt"
+    with open("test_data/ragflow.txt", "rb") as file:
+        blob = file.read()
+    document = {"displayed_name": displayed_name, "blob": blob}
+    documents = []
+    documents.append(document)
+    docs = kb.upload_documents(documents)
+    for doc in docs:
+        doc.add_chunk("This is a test to add chunk")
+    chat = rag.create_chat("test_update_chat", dataset_ids=[kb.id])
+    chat.update({"name": "new_chat"})
+
+
+def test_delete_chats_with_success(get_api_key_fixture):
+    API_KEY = get_api_key_fixture
+    rag = RAGFlow(API_KEY, HOST_ADDRESS)
+    kb = rag.create_dataset(name="test_delete_chat")
+    displayed_name = "ragflow.txt"
+    with open("test_data/ragflow.txt", "rb") as file:
+        blob = file.read()
+    document = {"displayed_name": displayed_name, "blob": blob}
+    documents = []
+    documents.append(document)
+    docs = kb.upload_documents(documents)
+    for doc in docs:
+        doc.add_chunk("This is a test to add chunk")
+    chat = rag.create_chat("test_delete_chat", dataset_ids=[kb.id])
+    rag.delete_chats(ids=[chat.id])
+
+def test_list_chats_with_success(get_api_key_fixture):
+    API_KEY = get_api_key_fixture
+    rag = RAGFlow(API_KEY, HOST_ADDRESS)
+    kb = rag.create_dataset(name="test_list_chats")
+    displayed_name = "ragflow.txt"
+    with open("test_data/ragflow.txt", "rb") as file:
+        blob = file.read()
+    document = {"displayed_name": displayed_name, "blob": blob}
+    documents = []
+    documents.append(document)
+    docs = kb.upload_documents(documents)
+    for doc in docs:
+        doc.add_chunk("This is a test to add chunk")
+    rag.create_chat("test_list_1", dataset_ids=[kb.id])
+    rag.create_chat("test_list_2", dataset_ids=[kb.id])
+    rag.list_chats()
+
+