class_docstr: Test ability to marshall selectbox protos.
docstr: Test that valid value is an int.
docstr_tok: ["Test","that","valid","value","is","an","int","."]
code: def test_valid_value(self):
      """Test that valid value is an int."""
      st.selectbox("the label", ("m", "f"), 1)
  
      c = self.get_delta_from_queue().new_element.selectbox
      self.assertEqual(c.label, "the label")
      self.assertEqual(c.default, 1)
  
imports: from unittest.mock import MagicMock, patch
  import numpy
  import pandas
  import pytest
  from parameterized import parameterized
  import streamlit
  from streamlit.errors import StreamlitAPIException
  from streamlit.proto.LabelVisibilityMessage_pb2 import LabelVisibilityMessage
  from streamlit.testing.v1.app_test import AppTest
  from streamlit.testing.v1.util import patch_config_options
  from tests.delta_generator_test_case import DeltaGeneratorTestCase
label_desc: Use image node_id 3 for calling the SelectboxTest obj's underlying member method code with example usage: obj.test_valid_value() without return types