class_docstr: Test ability to marshall arrow_vega_lite_chart protos.
class_docstr_tok: ["Test","ability","to","marshall","arrow_vega_lite_chart","protos","."]
docstr: Test that an error is raised when called with args set to None.
docstr_tok: ["Test","that","an","error","is","raised","when","called","with","args","set","to","None","."]
code: def test_none_args(self):
      """Test that an error is raised when called with args set to None."""
      with self.assertRaises(ValueError):
          st.vega_lite_chart(None, None)
  
imports: import json
  import pandas
  import pyarrow
  from parameterized import parameterized
  import streamlit
  from streamlit.errors import StreamlitAPIException
  from streamlit.type_util import bytes_to_data_frame, pyarrow_table_to_bytes
  from tests.delta_generator_test_case import DeltaGeneratorTestCase
label_desc: Use image node_id 2 for calling the ArrowVegaLiteTest obj's underlying member method code with example usage: obj.test_none_args() without return types