code: def test_readline(self):
      with self.open(os_helper.TESTFN, self.READMODE) as fp:
          data = []
          d = fp.readline()
          while d:
              data.append(d)
              d = fp.readline()
      self.assertEqual(data, DATA_SPLIT)
      self.assertEqual(repr(fp.newlines), repr(self.NEWLINE))
  
imports: import io
  import _pyio
  import unittest
  import os
  import sys
  from test.support import os_helper
label_desc: Use image node_id 5 for calling the TestGenericUnivNewlines obj's underlying member method code with example usage: obj.test_readline() without return types