class_docstr: Test ability to marshall button protos.
docstr: Test that it can be called.
docstr_tok: ["Test","that","it","can","be","called","."]
code: def test_button(self):
      """Test that it can be called."""
      st.button("the label")
  
      c = self.get_delta_from_queue().new_element.button
      self.assertEqual(c.label, "the label")
      self.assertEqual(c.default, False)
      self.assertEqual(c.form_id, "")
      self.assertEqual(c.type, "secondary")
      self.assertEqual(c.is_form_submitter, False)
      self.assertEqual(c.disabled, False)
  
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 1 for calling the ButtonTest obj's underlying member method code with example usage: obj.test_button() without return types