class_docstr: Resuming from the start step should work
class_docstr_tok: ["Resuming","from","the","start","step","should","work"]
code: def step_start(self):
      from metaflow import current
  
      if is_resumed():
          self.data = "foo"
          # Verify that the `current` singleton contains the correct origin
          # run_id by double-checking with the environment variables used
          # for tests.
          self.actual_origin_run_id = current.origin_run_id
          from metaflow_test import origin_run_id_for_resume
  
          self.expected_origin_run_id = origin_run_id_for_resume()
          assert len(self.expected_origin_run_id) > 0
      else:
          self.data = "bar"
          raise ResumeFromHere()
  
imports: from metaflow_test import MetaflowTest, ExpectationFailed, steps
label_desc: Use image node_id 1 for calling the ResumeStartStepTest obj's underlying member method code with example usage: obj.step_start() without return types