code: def test_remove_backspaces(self):
      testline = "abcd\x08\x08\x08efg\x08\x08hi\x08"
      removed = util.remove_backspaces(testline)
      self.assertTrue(removed == "aeh")
  
      testline = "abcd\x08\x08\x08efg\x08\x08hi"
      removed = util.remove_backspaces(testline)
      self.assertTrue(removed == "aehi")
  
      testline = "abcd"
      removed = util.remove_backspaces(testline)
      self.assertTrue(removed == "abcd")
  
      testline = "abcd\n\ndef"
      removed = util.remove_backspaces(testline)
      self.assertTrue(removed == testline)
  
imports: import unittest
  from studio import util
  from random import randint
label_desc: Use image node_id 1 for calling the UtilTest obj's underlying member method code with example usage: obj.test_remove_backspaces() without return types