class_docstr: Test ability to marshall metric protos and invalid input.
class_docstr_tok: ["Test","ability","to","marshall","metric","protos","and","invalid","input","."]
docstr: Test that metric can be called with label and value passed in.
docstr_tok: ["Test","that","metric","can","be","called","with","label","and","value","passed","in","."]
code: def test_label_and_value(self):
      """Test that metric can be called with label and value passed in."""
      st.metric("label_test", "123")
  
      c = self.get_delta_from_queue().new_element.metric
      self.assertEqual(c.label, "label_test")
      self.assertEqual(c.body, "123")
      self.assertEqual(c.color, MetricProto.MetricColor.GRAY)
      self.assertEqual(c.direction, MetricProto.MetricDirection.NONE)
  
imports: from parameterized import parameterized
  import streamlit
  from streamlit.errors import StreamlitAPIException
  from streamlit.proto.LabelVisibilityMessage_pb2 import LabelVisibilityMessage
  from streamlit.proto.Metric_pb2 import Metric
  from streamlit.type_util import _LOGGER
  from tests.delta_generator_test_case import DeltaGeneratorTestCase
label_desc: Use image node_id 2 for calling the MetricTest obj's underlying member method code with example usage: obj.test_label_and_value() without return types