code: def step_all(self):
      assert_equals("Regular Text File", self.myfile_txt)
      assert_equals("UTF Text File \u5e74", self.myfile_utf8)
      assert_equals(
          "UTF Text File \u5e74".encode(encoding="utf8"),
          self.myfile_binary,
      )
      assert_equals("Override Text File", self.myfile_overriden)
  
      # Check that an absent file does not make things crash
      assert_equals(None, self.absent_file)
      try:
          # Include files should be immutable
          self.myfile_txt = 5
          raise ExpectationFailed(AttributeError, "nothing")
      except AttributeError:
          pass
  
imports: from metaflow_test import MetaflowTest, ExpectationFailed, steps
label_desc: Use image node_id 1 for calling the BasicIncludeTest obj's underlying member method code with example usage: obj.step_all() without return types