code: def check_results(self, flow, checker):
      for step in flow:
          checker.assert_artifact(step.name, "nondefault_param", False)
          checker.assert_artifact(
              step.name, "str_param", "does this work?"
          )
          checker.assert_artifact(step.name, "json_param", {"a": [8]})
  
imports: from metaflow_test import MetaflowTest, ExpectationFailed, steps
label_desc: Use image node_id 3 for calling the DynamicParameterTest obj's underlying member method code with example usage: obj.check_results(flow, checker) without return types