class_docstr: Tests for every flavor of form/deltagenerator association.
class_docstr_tok: ["Tests","for","every","flavor","of","form\/deltagenerator","association","."]
docstr: By default, an element doesn't belong to a form.
code: def test_no_form(self):
      """By default, an element doesn't belong to a form."""
      st.checkbox("widget")
      self.assertEqual(NO_FORM_ID, self._get_last_checkbox_form_id())
  
imports: from unittest.mock import MagicMock, patch
  import streamlit
  from streamlit.errors import StreamlitAPIException
  from streamlit.runtime.state.session_state import RegisterWidgetResult
  from tests.delta_generator_test_case import DeltaGeneratorTestCase
label_desc: Use image node_id 2 for calling the FormAssociationTest obj's underlying member method code with example usage: obj.test_no_form() without return types