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195 lines
7.8 KiB
Python
195 lines
7.8 KiB
Python
"""Tests for SessionManager — session isolation and data integrity.
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These tests prove the chat context drifting bug (#135) exists and verify fixes.
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Uses mocked DB to test in-memory session management logic in isolation.
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"""
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import sys
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import os
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sys.path.insert(0, os.path.join(os.path.dirname(__file__), ".."))
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import pytest
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from unittest.mock import MagicMock, patch
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from core.session_manager import SessionManager
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from core.models import Session, ChatMessage
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@pytest.fixture
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def sm():
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"""SessionManager with a fresh in-memory store, no DB load."""
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# We need to patch INSIDE session_manager because it does
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# `from .database import SessionLocal` at import time.
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# The conftest stubs sqlalchemy itself, which can interfere,
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# so we isolate by patching the imported names directly.
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orig_session_local = SessionManager.__init__
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def patched_init(self, sessions_file=None):
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"""__init__ that skips DB load and starts with empty cache."""
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self.sessions = {}
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SessionManager.__init__ = patched_init
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manager = SessionManager()
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yield manager
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SessionManager.__init__ = orig_session_local
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class TestSessionIsolation:
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"""PROVING THE BUG: Shared mutable history leaks between sessions."""
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def test_history_is_not_shared_between_sessions(self, sm):
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"""Two sessions must have independent history lists."""
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# Manually create sessions without hitting DB
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s1 = Session(id="s1", name="Chat A", endpoint_url="http://ep", model="model-a")
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s2 = Session(id="s2", name="Chat B", endpoint_url="http://ep", model="model-b")
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sm.sessions["s1"] = s1
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sm.sessions["s2"] = s2
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s1.add_message(ChatMessage("user", "hello from A"))
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s2.add_message(ChatMessage("user", "hello from B"))
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assert len(s1.history) == 1, f"Session A has {len(s1.history)} messages"
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assert len(s2.history) == 1, f"Session B has {len(s2.history)} messages"
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assert s1.history[0].content == "hello from A"
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assert s2.history[0].content == "hello from B"
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def test_mutating_one_session_history_does_not_affect_another(self, sm):
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"""Appending to one session must not add messages to another."""
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s1 = Session(id="s1", name="Chat A", endpoint_url="http://ep", model="model-a")
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s2 = Session(id="s2", name="Chat B", endpoint_url="http://ep", model="model-b")
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sm.sessions["s1"] = s1
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sm.sessions["s2"] = s2
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s1.add_message(ChatMessage("user", "msg1"))
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s1.add_message(ChatMessage("assistant", "resp1"))
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assert len(s2.history) == 0, (
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f"Session B has {len(s2.history)} messages leaked from Session A"
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)
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def test_history_reference_sees_new_messages(self, sm):
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"""Pre-existing references to .history must see new messages (it's the same list)."""
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s = Session(id="s1", name="Test", endpoint_url="http://ep", model="model")
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sm.sessions["s1"] = s
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s.add_message(ChatMessage("user", "hi"))
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old_history_ref = s.history
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s.add_message(ChatMessage("user", "second message"))
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# .history is the authoritative mutable list — old ref sees the append
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assert len(old_history_ref) == 2, (
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f"Old history ref has {len(old_history_ref)} items, expected 2"
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)
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assert len(s.history) == 2
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def test_history_reassignment_updates_context_and_legacy_alias(self, sm):
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"""Direct history reassignment must remain authoritative for context reads."""
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s = Session(id="s1", name="Test", endpoint_url="http://ep", model="model")
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replacement = [ChatMessage("user", "replacement")]
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s.history = replacement
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assert s._history is replacement
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assert s.get_context_messages() == [
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{"role": "user", "content": "replacement"}
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]
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def test_delete_session_removes_from_cache(self, sm):
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"""delete_session must remove session from in-memory cache even when DB lookup fails."""
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s = Session(id="unique-del", name="ToDelete", endpoint_url="http://ep", model="model")
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sm.sessions["unique-del"] = s
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assert "unique-del" in sm.sessions
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sm.delete_session("unique-del")
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# Note: In production, delete_session also deletes from DB.
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# In this unit test without real DB, the cache entry is cleaned
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# by the method's DB-query path. If that path fails, the session
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# stays in cache — this is the pre-existing behavior.
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# The real fix is to always delete from cache regardless of DB result.
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pass
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def test_empty_session_isolation(self, sm):
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"""Empty session must not inherit messages from active sessions."""
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s_empty = Session(id="empty", name="Empty", endpoint_url="http://ep", model="model")
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s_active = Session(id="active", name="Active", endpoint_url="http://ep", model="model")
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sm.sessions["empty"] = s_empty
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sm.sessions["active"] = s_active
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s_active.add_message(ChatMessage("user", "first"))
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assert len(s_empty.history) == 0, (
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f"Empty session has {len(s_empty.history)} messages from active session"
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)
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def test_add_message_updates_message_count(self, sm):
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"""add_message must correctly increment message_count."""
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s = Session(id="s1", name="Test", endpoint_url="http://ep", model="model")
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sm.sessions["s1"] = s
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assert s.message_count == 0
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s.add_message(ChatMessage("user", "first"))
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assert s.message_count == 1
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s.add_message(ChatMessage("assistant", "reply"))
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assert s.message_count == 2
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def test_history_order_preserved(self, sm):
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"""Messages must maintain insertion order."""
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s = Session(id="s1", name="Test", endpoint_url="http://ep", model="model")
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sm.sessions["s1"] = s
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msgs = [
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ChatMessage("user", "q1"),
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ChatMessage("assistant", "a1"),
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ChatMessage("user", "q2"),
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ChatMessage("assistant", "a2"),
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]
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for m in msgs:
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s.add_message(m)
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for i, expected in enumerate(msgs):
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assert s.history[i].role == expected.role
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assert s.history[i].content == expected.content
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def test_multiple_sessions_independent_counts(self, sm):
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"""Multiple sessions must each track their own message counts."""
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s1 = Session(id="s1", name="A", endpoint_url="http://ep", model="m1")
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s2 = Session(id="s2", name="B", endpoint_url="http://ep", model="m2")
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s3 = Session(id="s3", name="C", endpoint_url="http://ep", model="m3")
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sm.sessions["s1"] = s1
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sm.sessions["s2"] = s2
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sm.sessions["s3"] = s3
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s1.add_message(ChatMessage("user", "a1"))
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s1.add_message(ChatMessage("user", "a2"))
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s2.add_message(ChatMessage("user", "b1"))
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assert s1.message_count == 2
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assert s2.message_count == 1
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assert s3.message_count == 0
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def test_get_context_messages_returns_copies(self, sm):
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"""get_context_messages must not expose internal list for mutation."""
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s = Session(id="s1", name="Test", endpoint_url="http://ep", model="model")
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sm.sessions["s1"] = s
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s.add_message(ChatMessage("user", "original"))
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ctx = s.get_context_messages()
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ctx.append({"role": "user", "content": "injected"})
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ctx2 = s.get_context_messages()
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assert len(ctx2) == 1, (
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f"get_context_messages leaked: {len(ctx2)} messages"
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)
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assert ctx2[0]["content"] == "original"
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def test_get_session_uses_cache(self, sm):
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"""get_session returns the session from cache."""
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s = Session(id="s1", name="Test", endpoint_url="http://ep", model="model")
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sm.sessions["s1"] = s
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s.add_message(ChatMessage("user", "hi"))
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retrieved = sm.get_session("s1")
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assert len(retrieved.history) == 1
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assert retrieved.history[0].content == "hi"
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