text: # file name can vary
  try:
      # llvm 7 name
      with open("cfg.testme.dot") as fin:
          got = fin.read()
  except IOError:
      # llvm 8 name
      with open(".testme.dot") as fin:
          got = fin.read()
  
  assert '[label="W:1"]' in got
  assert '[label="W:9"]' in got
  