Fix AttributeError in ContextualMemory when using Mem0 memory provider

Co-Authored-By: Joe Moura <joao@crewai.com>

tests/memory/user_memory_test.py

@@ -0,0 +1,78 @@
+import pytest
+from unittest.mock import MagicMock, patch
+
+from crewai.crew import Crew
+from crewai.agent import Agent
+from crewai.task import Task
+from crewai.memory.user.user_memory import UserMemory
+from crewai.memory.contextual.contextual_memory import ContextualMemory
+from crewai.memory.short_term.short_term_memory import ShortTermMemory
+from crewai.memory.long_term.long_term_memory import LongTermMemory
+from crewai.memory.entity.entity_memory import EntityMemory
+from crewai.process import Process
+
+
+class MockMemoryClient:
+    def __init__(self, *args, **kwargs):
+        pass
+
+    def search(self, *args, **kwargs):
+        return [{"memory": "Test memory", "score": 0.9}]
+
+    def add(self, *args, **kwargs):
+        pass
+
+
+def test_contextual_memory_with_mem0_client():
+    # Create a mock mem0 client
+    mock_mem0_client = MockMemoryClient()
+
+    # Create agent and task
+    agent = Agent(
+        role="Researcher",
+        goal="Search relevant data and provide results",
+        backstory="You are a researcher at a leading tech think tank.",
+        verbose=True,
+    )
+
+    task = Task(
+        description="Perform a search on specific topics.",
+        expected_output="A list of relevant URLs based on the search query.",
+        agent=agent,
+    )
+
+    # Create a UserMemory instance with our mock client
+    user_memory = UserMemory(crew=None)
+    # Manually set the storage memory to our mock client
+    user_memory.storage.memory = mock_mem0_client
+
+    # Create crew with mem0 as memory provider and pass the UserMemory instance
+    crew = Crew(
+        agents=[agent],
+        tasks=[task],
+        process=Process.sequential,
+        memory=True,
+        memory_config={
+            "provider": "mem0",
+            "config": {
+                "user_id": "test_user",
+            },
+            "user_memory": user_memory
+        },
+    )
+
+    # Create contextual memory manually with the crew's memory components
+    contextual_memory = ContextualMemory(
+        memory_config=crew.memory_config,
+        stm=crew._short_term_memory,
+        ltm=crew._long_term_memory,
+        em=crew._entity_memory,
+        um=crew._user_memory,
+    )
+
+    # Test _fetch_user_context
+    result = contextual_memory._fetch_user_context("test query")
+    
+    # Should return formatted memories from the mock client
+    assert "User memories/preferences" in result
+    assert "- Test memory" in result