Remove tests of unsupported Python versions (#642)

Author: AdrienVannson

src/betterproto/enum.py

@@ -1,6 +1,5 @@
 from __future__ import annotations
 
-import sys
 from enum import (
     EnumMeta,
     IntEnum,
@@ -90,15 +89,8 @@ def __call__(cls, value: int) -> Enum:
         def __iter__(cls) -> Generator[Enum, None, None]:
             yield from cls._member_map_.values()
 
-        if sys.version_info >= (3, 8):  # 3.8 added __reversed__ to dict_values
-
-            def __reversed__(cls) -> Generator[Enum, None, None]:
-                yield from reversed(cls._member_map_.values())
-
-        else:
-
-            def __reversed__(cls) -> Generator[Enum, None, None]:
-                yield from reversed(tuple(cls._member_map_.values()))
+        def __reversed__(cls) -> Generator[Enum, None, None]:
+            yield from reversed(cls._member_map_.values())
 
         def __getitem__(cls, key: str) -> Enum:
             return cls._member_map_[key]

tests/grpc/test_grpclib_client.py

@@ -1,5 +1,4 @@
 import asyncio
-import sys
 import uuid
 
 import grpclib
@@ -91,9 +90,6 @@ async def test_trailer_only_error_stream_unary(
 
 
 @pytest.mark.asyncio
-@pytest.mark.skipif(
-    sys.version_info < (3, 8), reason="async mock spy does works for python3.8+"
-)
 async def test_service_call_mutable_defaults(mocker):
     async with ChannelFor([ThingService()]) as channel:
         client = ThingServiceClient(channel)