Fix issue #2379: Implement timeout mechanism for max_execution_time

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

tests/test_timeout/test_agent_timeout.py

@@ -0,0 +1,58 @@
+import time
+import pytest
+from unittest.mock import patch, MagicMock
+from crewai import Agent, Task
+
+def test_agent_max_execution_time():
+    """Test that max_execution_time parameter is enforced."""
+    # Create a simple test function that will be used to simulate a long-running task
+    def test_timeout():
+        # Create an agent with a 1-second timeout
+        with patch('crewai.agent.Agent.create_agent_executor'):
+            agent = Agent(
+                role="Test Agent",
+                goal="Test timeout functionality",
+                backstory="I am testing the timeout functionality",
+                max_execution_time=1,
+                verbose=True
+            )
+            
+            # Create a task that will take longer than 1 second
+            task = Task(
+                description="Sleep for 5 seconds and then return a result",
+                expected_output="The result after sleeping",
+                agent=agent
+            )
+            
+            # Mock the agent_executor to simulate a long-running task
+            mock_executor = MagicMock()
+            def side_effect(*args, **kwargs):
+                # Sleep for longer than the timeout to trigger the timeout mechanism
+                time.sleep(2)
+                return {"output": "This should never be returned due to timeout"}
+            
+            mock_executor.invoke.side_effect = side_effect
+            mock_executor.tools_names = []
+            mock_executor.tools_description = []
+            
+            # Replace the agent's executor with our mock
+            agent.agent_executor = mock_executor
+            
+            # Mock the event bus to avoid any real event emissions
+            with patch('crewai.agent.crewai_event_bus'):
+                # Execute the task and measure the time
+                start_time = time.time()
+                
+                # We expect an Exception to be raised due to timeout
+                with pytest.raises(Exception) as excinfo:
+                    agent.execute_task(task)
+                
+                # Check that the execution time is close to 1 second (the timeout)
+                execution_time = time.time() - start_time
+                assert execution_time <= 2.1, f"Execution took {execution_time:.2f} seconds, expected ~1 second"
+                
+                # Check that the exception message mentions timeout
+                assert "timeout" in str(excinfo.value).lower() or "execution time" in str(excinfo.value).lower()
+    
+    # Run the test function
+    test_timeout()