old_contents: from example_source import add_two
  
  
  def test_external_method():
    assert add_two(2) == 4
  
new_contents: from .example_source import add_two
  
  
  def test_external_method():
    assert add_two(2) == 4
  
subject: Fix relative import for testprojects dummy test on Python 3 (#6942)