Restore total_bytes to EmptyStreamReader (#10387)

Author: bdraco

CHANGES/10387.bugfix.rst

@@ -0,0 +1 @@
+Restored the missing ``total_bytes`` attribute to ``EmptyStreamReader`` -- by :user:`bdraco`.

aiohttp/streams.py

@@ -540,6 +540,7 @@ class EmptyStreamReader(StreamReader):  # lgtm [py/missing-call-to-init]
 
     def __init__(self) -> None:
         self._read_eof_chunk = False
+        self.total_bytes = 0
 
     def __repr__(self) -> str:
         return "<%s>" % self.__class__.__name__

tests/test_streams.py

@@ -1119,6 +1119,7 @@ async def test_empty_stream_reader() -> None:
     with pytest.raises(asyncio.IncompleteReadError):
         await s.readexactly(10)
     assert s.read_nowait() == b""
+    assert s.total_bytes == 0
 
 
 async def test_empty_stream_reader_iter_chunks() -> None: