Fix issue #2421: Handle missing google.genai dependency gracefully

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

tests/test_output_pydantic.py

@@ -0,0 +1,65 @@
+import pytest
+from unittest.mock import patch, MagicMock
+from pydantic import BaseModel, Field
+from crewai import Agent, Task, Crew
+from crewai.utilities.converter import Converter
+
+class ResponseFormat(BaseModel):
+    string: str = Field(description='string needs to be maintained')
+
+def test_pydantic_model_conversion():
+    """Test that pydantic model conversion works without causing import errors."""
+    
+    # Test data
+    test_string = '{"string": "test value"}'
+    
+    # Create a pydantic model directly
+    result = ResponseFormat.model_validate_json(test_string)
+    
+    # Verify the conversion worked
+    assert result is not None
+    assert hasattr(result, "string")
+    assert isinstance(result.string, str)
+    assert result.string == "test value"
+
+@patch('crewai.crew.Crew.kickoff')
+def test_output_pydantic_with_mocked_crew(mock_kickoff):
+    """Test that output_pydantic works properly without causing import errors."""
+    
+    # Mock the crew kickoff to return a valid response
+    mock_result = ResponseFormat(string="mocked result")
+    mock_kickoff.return_value = mock_result
+    
+    # Create a simple agent
+    agent = Agent(
+        role="Test Agent",
+        goal="Test pydantic model output",
+        backstory="Testing pydantic output functionality",
+        verbose=True
+    )
+    
+    # Create a task with output_pydantic
+    task = Task(
+        description="Return a simple string",
+        expected_output="A simple string",
+        agent=agent,
+        output_pydantic=ResponseFormat
+    )
+    
+    # Create a crew with the agent and task
+    crew = Crew(
+        agents=[agent],
+        tasks=[task],
+        verbose=True
+    )
+    
+    # Execute the crew (this will use our mock)
+    result = crew.kickoff()
+    
+    # Verify we got a result
+    assert result is not None
+    
+    # Verify the result has a string attribute (as defined in ResponseFormat)
+    assert hasattr(result, "string")
+    assert isinstance(result.string, str)
+    assert result.string == "mocked result"