class_docstr: Test that log messages emitted in the first step
  are saved and readable.
class_docstr_tok: ["Test","that","log","messages","emitted","in","the","first","step","are","saved","and","readable","."]
code: def step_all(self):
      pass
  
imports: from metaflow_test import MetaflowTest, ExpectationFailed, steps
label_desc: Use image node_id 2 for calling the BasicLogTest obj's underlying member method code with example usage: obj.step_all() without return types