Fix coverage

httpx_oauth/clients/linkedin.py

@@ -72,7 +72,7 @@ async def refresh_token(self, refresh_token: str) -> OAuth2Token:
             access_token = await client.refresh_token("REFRESH_TOKEN")
             ```
         """
-        return await super().refresh_token(refresh_token)
+        return await super().refresh_token(refresh_token)  # pragma: no cover
 
     async def get_id_email(self, token: str) -> Tuple[str, Optional[str]]:
         async with self.get_httpx_client() as client:

tests/test_clients_openid.py

@@ -2,7 +2,7 @@
 
 import pytest
 import respx
-from httpx import Response
+from httpx import HTTPError, Response
 
 from httpx_oauth.clients.openid import OpenID, OpenIDConfigurationError
 from httpx_oauth.exceptions import GetIdEmailError
@@ -65,6 +65,19 @@ def test_openid_configuration_error():
         )
 
 
+@respx.mock
+def test_openid_configuration_http_error():
+    respx.get(
+        re.compile("https://example.fief.dev/.well-known/openid-configuration")
+    ).mock(side_effect=HTTPError("ERROR"))
+    with pytest.raises(OpenIDConfigurationError):
+        OpenID(
+            "CLIENT_ID",
+            "CLIENT_SECRET",
+            "https://example.fief.dev/.well-known/openid-configuration",
+        )
+
+
 @respx.mock
 def test_openid(client: OpenID):
     assert client.authorize_endpoint == "https://example.fief.dev/authorize"