new_contents: import pytest
  
  from .helpers import *
  
  def test_normalize_data_events():
      assert (normalize_data_events(
          [Data(data=bytearray(b"1")), Data(data=b"2"),
           Response(status_code=200, headers=[]),
           Data(data=b"3"), Data(data=b"4"),
           EndOfMessage(),
           Data(data=b"5"), Data(data=b"6"), Data(data=b"7")]
          ) == [
              Data(data=b"12"),
              Response(status_code=200, headers=[]),
              Data(data=b"34"),
              EndOfMessage(),
              Data(data=b"567"),
              ])
  
subject: add missed file