class_docstr: Test ability to marshall button protos.
docstr: Test use_container_width can be set to true.
docstr_tok: ["Test","use_container_width","can","be","set","to","true","."]
code: def test_use_container_width_can_be_set_to_true(self):
      """Test use_container_width can be set to true."""
      st.button("the label", use_container_width=True)
  
      c = self.get_delta_from_queue().new_element.button
      self.assertEqual(c.use_container_width, True)
  
file_path: streamlit/lib/tests/streamlit/elements/button_test.py
imports: import streamlit
  from tests.delta_generator_test_case import DeltaGeneratorTestCase
label_desc: Use image node_id 4 for calling the ButtonTest obj's underlying member method code with example usage: obj.test_use_container_width_can_be_set_to_true() without return types