Fix coverage issues

(cherry picked from commit praw-dev/prawcore@83aa52c)

.coveragerc

@@ -0,0 +1,5 @@
+[report]
+exclude_lines =
+    @abstract
+    if TYPE_CHECKING:
+    pragma: no cover

asyncprawcore/auth.py

@@ -22,7 +22,7 @@
 from .codes import codes
 from .exceptions import InvalidInvocation, OAuthException, ResponseException
 
-if TYPE_CHECKING:  # pragma: no cover
+if TYPE_CHECKING:
     from asyncprawcore.requestor import Requestor
 
 

asyncprawcore/exceptions.py

@@ -3,7 +3,7 @@
 from typing import TYPE_CHECKING, Any, Dict, List, Optional, Tuple, Union
 from urllib.parse import urlparse
 
-if TYPE_CHECKING:  # pragma: no cover
+if TYPE_CHECKING:
     from aiohttp import ClientResponse
 
 

asyncprawcore/rate_limit.py

@@ -4,7 +4,7 @@
 import time
 from typing import TYPE_CHECKING, Any, Awaitable, Callable, Dict, Mapping, Optional
 
-if TYPE_CHECKING:  # pragma: no cover
+if TYPE_CHECKING:
     from aiohttp import ClientResponse
 
 log = logging.getLogger(__package__)

asyncprawcore/requestor.py

@@ -7,7 +7,7 @@
 from .const import TIMEOUT, __version__
 from .exceptions import InvalidInvocation, RequestException
 
-if TYPE_CHECKING:  # pragma: no cover
+if TYPE_CHECKING:
     from asyncio import AbstractEventLoop
 
     from .sessions import Session

asyncprawcore/sessions.py

@@ -30,7 +30,7 @@
 from .rate_limit import RateLimiter
 from .util import authorization_error_class
 
-if TYPE_CHECKING:  # pragma: no cover
+if TYPE_CHECKING:
     from io import BufferedReader
 
     from aiofiles.threadpool.binary import AsyncBufferedReader

asyncprawcore/util.py

@@ -1,14 +1,19 @@
 """Provide utility for the asyncprawcore package."""
+from typing import TYPE_CHECKING, Union
+
 from .exceptions import Forbidden, InsufficientScope, InvalidToken
 
+if TYPE_CHECKING:
+    from aiohttp import ClientResponse
+
 _auth_error_mapping = {
     403: Forbidden,
     "insufficient_scope": InsufficientScope,
     "invalid_token": InvalidToken,
 }
 
 
-def authorization_error_class(response):
+def authorization_error_class(response: "ClientResponse") -> Union[InvalidToken, Forbidden, InsufficientScope]:
     """Return an exception instance that maps to the OAuth Error.
 
     :param response: The HTTP response containing a www-authenticate error.