old_contents: """
  Fallback to callee definition when definition not found.
  - https://github.com/davidhalter/jedi/issues/131
  - https://github.com/davidhalter/jedi/pull/149
  """
  
  #? isinstance
  isinstance(
  )
  
  #? isinstance
  isinstance(None,
  )
  
  #? isinstance
  isinstance(None, 
  )
  
new_contents: """
  Fallback to callee definition when definition not found.
  - https://github.com/davidhalter/jedi/issues/131
  - https://github.com/davidhalter/jedi/pull/149
  """
  
  #? isinstance
  isinstance(
  )
  
  #? isinstance
  isinstance(None,
  )
  
  #? isinstance
  isinstance(None, 
  )
  
  # Note: len('isinstance(') == 11
  #? 11 isinstance
  isinstance()
  
  # Note: len('isinstance(None,') == 16
  ##? 16 isinstance
  isinstance(None,)
  
  # Note: len('isinstance(None,') == 16
  ##? 16 isinstance
  isinstance(None, )
  
  # Note: len('isinstance(None, ') == 17
  ##? 17 isinstance
  isinstance(None, )
  
  # Note: len('isinstance( ') == 12
  ##? 12 isinstance
  isinstance( )
  
subject: Add blackbox tests using column number