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_session.py

@@ -0,0 +1,110 @@
+from ragflow_sdk import RAGFlow,Agent
+from common import HOST_ADDRESS
+import pytest
+
+
+def test_create_session_with_success(get_api_key_fixture):
+    API_KEY = get_api_key_fixture
+    rag = RAGFlow(API_KEY, HOST_ADDRESS)
+    kb = rag.create_dataset(name="test_create_session")
+    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")
+    assistant=rag.create_chat("test_create_session", dataset_ids=[kb.id])
+    assistant.create_session()
+
+
+def test_create_conversation_with_success(get_api_key_fixture):
+    API_KEY = get_api_key_fixture
+    rag = RAGFlow(API_KEY, HOST_ADDRESS)
+    kb = rag.create_dataset(name="test_create_conversation")
+    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")
+    assistant = rag.create_chat("test_create_conversation", dataset_ids=[kb.id])
+    session = assistant.create_session()
+    question = "What is AI"
+    for ans in session.ask(question):
+        pass
+    
+    # assert not ans.content.startswith("**ERROR**"), "Please check this error."
+
+
+def test_delete_sessions_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_session")
+    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")
+    assistant=rag.create_chat("test_delete_session", dataset_ids=[kb.id])
+    session = assistant.create_session()
+    assistant.delete_sessions(ids=[session.id])
+
+
+def test_update_session_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_session")
+    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")
+    assistant = rag.create_chat("test_update_session", dataset_ids=[kb.id])
+    session = assistant.create_session(name="old session")
+    session.update({"name": "new session"})
+
+
+def test_list_sessions_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_session")
+    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")
+    assistant=rag.create_chat("test_list_session", dataset_ids=[kb.id])
+    assistant.create_session("test_1")
+    assistant.create_session("test_2")
+    assistant.list_sessions()
+
+@pytest.mark.skip(reason="")
+def test_create_agent_session_with_success(get_api_key_fixture):
+    API_KEY = "ragflow-BkOGNhYjIyN2JiODExZWY5MzVhMDI0Mm"
+    rag = RAGFlow(API_KEY,HOST_ADDRESS)
+    Agent.create_session("2e45b5209c1011efa3e90242ac120006", rag)
+
+@pytest.mark.skip(reason="")
+def test_create_agent_conversation_with_success(get_api_key_fixture):
+    API_KEY = "ragflow-BkOGNhYjIyN2JiODExZWY5MzVhMDI0Mm"
+    rag = RAGFlow(API_KEY,HOST_ADDRESS)
+    session = Agent.create_session("2e45b5209c1011efa3e90242ac120006", rag)
+    session.ask("What is this job")