'Check that the file correctly preprocess the code source.'

def testCppPreprocess(self):

    cpp_pb = desc2code.Desc2CodeCppProblem()
    self.assertEqual(cpp_pb.preprocess_target('firstline//comm1\nsecondline//comm2\n'), 'firstline    secondline')
    self.assertEqual(cpp_pb.preprocess_target(CODE_CPP_IN), CODE_CPP_OUT)
    self.assertEqual(cpp_pb.preprocess_target('        not    removed    //abcd        '), 'not    removed    //abcd')
