code: def step_all(self):
      from metaflow import current, Task
  
      run = Task(current.pathspec).parent.parent
      for i in range(7):
          tag = str(i)
          run.add_tag(tag)
          assert tag in run.user_tags
          run.remove_tag(tag)
          assert tag not in run.user_tags
  
imports: from metaflow_test import MetaflowTest, ExpectationFailed, steps
label_desc: Use image node_id 1 for calling the TagMutationTest obj's underlying member method code with example usage: obj.step_all() without return types