Fix issue #2219: Handle callable agents in CrewBase decorator

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

tests/test_crewbase_agent_method.py

@@ -0,0 +1,32 @@
+import unittest
+from crewai import Agent, Task
+
+
+class TestTaskInitFix(unittest.TestCase):
+    """Test the fix for issue #2219 where agent methods are not handled correctly in tasks."""
+
+    def test_task_init_handles_callable_agent(self):
+        """Test that the Task.__init__ method correctly handles callable agents."""
+        
+        # Create an agent instance
+        agent_instance = Agent(
+            role="Test Agent",
+            goal="Test Goal",
+            backstory="Test Backstory"
+        )
+        
+        # Create a callable that returns the agent instance
+        def callable_agent():
+            return agent_instance
+        
+        # Create a task with the callable agent
+        task = Task(
+            description="Test Task",
+            expected_output="Test Output",
+            agent=callable_agent
+        )
+        
+        # Verify that the agent in the task is an instance, not a callable
+        self.assertIsInstance(task.agent, Agent)
+        self.assertEqual(task.agent.role, "Test Agent")
+        self.assertIs(task.agent, agent_instance)