code: def test_function_move_the_device_to_gpu_if_compatible(self, context):
      context_instance = context.return_value
      mock_function = MagicMock(spec=GPUCompatible)
      gpu_mock_function = Mock(return_value=pd.DataFrame())
      gpu_device_id = "2"
  
      mock_function.to_device.return_value = gpu_mock_function
      context_instance.gpu_device.return_value = gpu_device_id
  
      expression = FunctionExpression(
          lambda: mock_function, name="test", alias=Alias("func_expr")
      )
      input_batch = Batch(frames=pd.DataFrame())
      expression.evaluate(input_batch)
      mock_function.to_device.assert_called_with(gpu_device_id)
      gpu_mock_function.assert_called()
  
file_path: evadb/test/unit_tests/expression/test_function_expression.py
imports: import unittest
  import pandas
  from mock import MagicMock, Mock, patch
  from evadb.constants import NO_GPU
  from evadb.expression.function_expression import FunctionExpression
  from evadb.functions.gpu_compatible import GPUCompatible
  from evadb.models.storage.batch import Batch
  from evadb.parser.alias import Alias
label_desc: Use image node_id 1 for calling the FunctionExpressionTest obj's underlying member method code with example usage: obj.test_function_move_the_device_to_gpu_if_compatible(context) without return types