docstr: Check that the file correctly preprocess the code source.
docstr_tok: ["Check","that","the","file","correctly","preprocess","the","code","source","."]
code: def testCppPreprocess(self):
      """Check that the file correctly preprocess the code source."""
      cpp_pb = desc2code.ProgrammingDesc2codeCpp()
  
      self.assertEqual(  # Add space beween two lines
          cpp_pb.preprocess_target(
              "firstline//comm1\nsecondline//comm2\n"
          ),
          "firstline secondline",
      )
      # Checking for boths comments and spaces
      self.assertEqual(
          cpp_pb.preprocess_target(CODE_CPP_IN), CODE_CPP_OUT
      )
      self.assertEqual(
          cpp_pb.preprocess_target("  not removed //abcd  "),
          "not removed //abcd",
      )
  
file_path: tensor2tensor/tensor2tensor/data_generators/desc2code_test.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from tensor2tensor.data_generators import desc2code
  import tensorflow.compat.v1
label_desc: Use image node_id 1 for calling the Desc2codeTest obj's underlying member method code with example usage: obj.testCppPreprocess() without return types