code: def testHloModuleToHloText(self):
      computation = self.ExampleComputation()
      hlo_text = computation.as_hlo_module().to_string()
      self.assertTrue(hlo_text.startswith("HloModule acomputation"))
  
imports: import unittest
  from absl.testing import absltest
  import numpy
  from xla.python import xla_client
label_desc: Use image node_id 4 for calling the ComputationPrinting obj's underlying member method code with example usage: obj.testHloModuleToHloText() without return types